====== Engine Timing ====== Engine timing is the most important thing in these engines. This is the dark art. Timing is what determines the performance level of the engine. This is where the biggest gains are. The second most important thing in the engine is the bore and stroke. This will tell you how the power curve will be shaped. Port count is the next important thing. However port count doesnt determine the performance nor the powerband. 3 Port engines can perform as good or better then 5, 7, 9, etc port engines. Higher port count doesnt mean more flow, it just means airflow control. With the addition of more ports you actually lose port area. So these extra ports are just shaping the flow through the sleeve into the chamber. This has affects on the air fuel mixture in the chamber. ====== Engine Timing Table ====== This is the most complete timing number database that you will find for RC Nitro engines. Note: In obtaining this info there was modified timings as well. I consider this to be private information and im not willing to publicize someone elses private intellectual property. So any notes in relation to changes or what to do have been removed. I instead I tell you to do your own research and development. You will learn far more then you ever would copying. This site will only show engines that you can or could at the time buy off the shelf as stock or tuned by the factory. Special Thanks: 1st Racing Germany for the initial timing sheet off of their old website. Roelof Tooms of the Netherlands and Adam Blevins from the late AB Mods in USA for the timing numbers of all of the engines that came through their hands. __//**The timing of the sleeve ports is only listed once, as these have the same degree opening and closing time anyway. Only the crankshaft opening and closing times are not symmetrical. In times where there is number+number then that means it is a multi port exhaust and the timings differ. The higher timing number is on the outer ports. Additionally if you see Boost and Timing have the same numbers its because they are the same. Differences in these started showing up in the late 90s/early 2000s engines.**//__ ===== Alpha ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Alpha F850 5 Port (Stock) | 21 | 16.30 x 16.80 | 63.5 Degrees | 127 Degrees | 63.5 Degrees | 127 Degrees | 87 Degrees | 174 Degrees | 42 Degrees | 60 Degrees | 198 Degrees | N/A | | Alpha Z852 7 Port (Stock) | 21 | 16.26 x 16.80 | 63.5 Degrees | 127 Degrees | 63.5 Degrees | 127 Degrees | 87 Degrees | 174 Degrees | 42 Degrees | 60 Degrees | 198 Degrees | N/A | ===== Arrow Racing ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Arrow Racing GTR21 (Stock) | 21 | 16.60 x 16.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 84 Degrees | 168 Degrees | 25 Degrees | 73 Degrees | 228 Degrees | N/A | ===== Axe Rossi ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | AXE Rossi Cobra (Stock) | 21 | 16.00 x 17.40 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 83 Degrees | 166 Degrees | 34 Degrees | 64 Degrees | 210 Degrees | Notes ((The valve timing has been slightly modified compared to the 2006 engine. Like the RB engines of the C6BB series, Rossi now uses a MES (Multiexhaust) system with different exhaust timings, so that the main exhaust has a timing of 166° and the lead exhausts 178°. This promises a significant increase in torque without sacrificing revs. The port timings have also been slightly reduced, which also affects fuel consumption. The crankshaft timing was only slightly modified, but a significant difference – and this is what makes it special – is that the crankshaft is not potted with silicone, but instead has a hard plastic insert that covers the entire bore of the shaft. Even with improper engine treatment using the wrong preservative oils, there are no problems with the silicone swelling or the insert potentially falling out, especially since the plastic insert is additionally anchored in the crankshaft. The shaft is balanced twice using tungsten inserts. The main bearing, which is fitted with ceramic balls , is standard equipment on the X1 Evolution series.)) | | AXE Rossi Cobra X1 Evo (Stock) | 21 | 16.00 x 17.40 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 83+89 Degrees | 166+178 Degrees | 36 Degrees | 64 Degrees | 208 Degrees | Notes ((The valve timing has been slightly modified compared to the 2006 engine. Like the RB engines of the C6BB series, Rossi now uses a MES (Multiexhaust) system with different exhaust timings, so that the main exhaust has a timing of 166° and the lead exhausts 178°. This promises a significant increase in torque without sacrificing revs. The port timings have also been slightly reduced, which also affects fuel consumption. The crankshaft timing was only slightly modified, but a significant difference – and this is what makes it special – is that the crankshaft is not potted with silicone, but instead has a hard plastic insert that covers the entire bore of the shaft. Even with improper engine treatment using the wrong preservative oils, there are no problems with the silicone swelling or the insert potentially falling out, especially since the plastic insert is additionally anchored in the crankshaft. The shaft is balanced twice using tungsten inserts. The main bearing, which is fitted with ceramic balls , is standard equipment on the X1 Evolution series.)) | | AXE Rossi Mamba (Stock) | 21 | 16.44 x 16.48 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 84 Degrees | 168 Degrees | 37 Degrees | 63 Degrees | 206 Degrees | N/A | | AXE Rossi Mamba X1 Evo (Stock) | 21 | 16.44 x 16.48 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 84+89.5 Degrees | 168+179 Degrees | 33 Degrees | 64 Degrees | 211 Degrees | N/A | ===== Axial ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Axial 32 Spec 1S (Stock) | 21 | 19.5 x 17.50 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 87.5 Degrees | 175 Degrees | 34 Degrees | 48 Degrees | 194 Degrees | N/A | ===== Cipolla ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Cipolla Buggy (Stock) | 21 | 16.00x17.22 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 84 Degrees | 168 Degrees | 38 Degrees | 55 Degrees | 197 Degrees | N/A | | Cipolla MC28 Free Climber (Stock) | 28 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 85 Degrees | 170 Degrees | 33 Degrees | 62 Degrees | 209 Degrees | N/A | ===== CMB ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | CMB Evo4-R (Stock) | 21 | 16.15x17.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 87 Degrees | 174 Degrees | 23 Degrees | 68 Degrees | 225 Degrees | N/A | | CMB 21RS (Stock) | 21 | 16.33x16.70 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 93 Degrees | 186 Degrees | 28 Degrees | 65 Degrees | 217 Degrees | N/A | ===== Dynamite ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Dynamite Mach 28 (Stock) | 21 | 18.50x17.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 84 Degrees | 168 Degrees | 48 Degrees | 45 Degrees | 177 Degrees | N/A | ===== FX Engines ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | FX Engines K301 (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 84 Degrees | 168 Degrees | 25 Degrees | 70 Degrees | 225 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | FX Engines K303 (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 85 Degrees | 170 Degrees | 25.5 Degrees | 70 Degrees | 224.5 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== Go Tech ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Go 25 (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 84 Degrees | 168 Degrees | 32 Degrees | 59 Degrees | 207 Degrees | N/A | | Go 25 Pro (Stock) | 21 | 00.00x00.00 | 84 Degrees | 168 Degrees | 84 Degrees | 168 Degrees | 84 Degrees | 168 Degrees | 32 Degrees | 59 Degrees | 168 Degrees | N/A | | Go 21R/Pro 7P+2 (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 83 Degrees | 166 Degrees | 33 Degrees | 60 Degrees | 207 Degrees | N/A | | Go 21-7PT (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 84 Degrees | 168 Degrees | 34 Degrees | 55 Degrees | 201 Degrees | N/A | | Go 21 GX5R (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 84 Degrees | 168 Degrees | 32 Degrees | 57 Degrees | 205 Degrees | N/A | ===== HPI ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | HPI Nitro Star T15 (Stock) | 15 | 15.00x13.60 | 57 Degrees | 114 Degrees | 57 Degrees | 114 Degrees | 82 Degrees | 164 Degrees | 28 Degrees | 48 Degrees | 200 Degrees | N/A | ===== Ielasi Tuned ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | Ielasi Tuned 9CL (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 95+90 Degrees | 190+180 Degrees | 31 Degrees | 71 Degrees | 220 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== Infinity ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Infinity Samurai 521 (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 88 Degrees | 176 Degrees | 44 Degrees | 56 Degrees | 192 Degrees | N/A | ===== JP Racing ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | JP Racing BR21SBK01 (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 86 Degrees | 172 Degrees | 36 Degrees | 62 Degrees | 206 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | JP Racing PR21 P5 (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 85 Degrees | 170 Degrees | 37 Degrees | 61 Degrees | 204 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | JP Racing FX21-B5T (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 84.5 Degrees | 169 Degrees | 33 Degrees | 62 Degrees | 209 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | JP Racing 35Plus21 V2 (2017) (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 33 Degrees | 64 Degrees | 221 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== JX Ninja ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Ninja JX21-B01 (Stock) | 21 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 86 Degrees | 172 Degrees | 33 Degrees | 66 Degrees | 213 Degrees | N/A | | Ninja JX21-B01A (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 83 Degrees | 166 Degrees | 33 Degrees | 65 Degrees | 212 Degrees | N/A | ===== Kyosho ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Kyosho GXR15 (Stock) | 15 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 75 Degrees | 150 Degrees | 28 Degrees | 44 Degrees | 196 Degrees | N/A | ===== LRP ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | LRP .30 Spec II (Stock) | 21 | 00.00x00.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 84 Degrees | 168 Degrees | 26 Degrees | 61 Degrees | 215 Degrees | N/A | ===== Max Power ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | Max Power/Max Thunder 21 (Stock) | 21 | 00.00x00.00 | 60 Degrees | 120 Degrees | 60 Degrees | 120 Degrees | 84 Degrees | 168 Degrees | 36 Degrees | 60 Degrees | 204 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Max Power RP9 S WC 14mm crank (Stock) | 21 | 0x0 | 68 Degrees | 136 Degrees | 68 Degrees| 136 Degrees | 92 Degrees | 184 Degrees | 26 Degrees | 70 Degrees | 224 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Max Power RP9 S WC AAC (Stock) | 21 | 0x0 | 66 Degrees | 132 Degrees | 66 Degrees| 132 Degrees | 93 Degrees | 186 Degrees | 26 Degrees | 70 Degrees | 224 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Max Power RP9 S WC California AAC (Stock) | 21 | 0x0 | 67 Degrees | 134 Degrees | 67 Degrees| 134 Degrees | 90 Degrees | 180 Degrees | 22 Degrees | 71 Degrees | 229 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== MR Ninja ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Ninja MR21-B01 (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 86 Degrees | 172 Degrees | 29 Degrees | 62 Degrees | 213 Degrees | N/A | ===== Nosram ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Nosram RS21 Evo Buggy (Stock) | 21 | 00.00x00.00 | 67 Degrees | 134 Degrees | 67 Degrees | 134 Degrees | 87 Degrees | 174 Degrees | 35 Degrees | 62 Degrees | 207 Degrees | N/A | ===== Nova Mega ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | NovaMega MF21 (Massimo Fantini) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 93 Degrees | 186 Degrees | 33 Degrees | 60 Degrees | 207 Degrees | N/A | | NovaMega MF12 (Massimo Fantini) | 12 | 00.00x00.00 | 60 Degrees | 120 Degrees | 60 Degrees | 120 Degrees | 86.5 Degrees | 173 Degrees | 35 Degrees | 58 Degrees | 203 Degrees | N/A | ===== Novarossi ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | Novarossi S421B (Stock) | 21 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 84 Degrees | 168 Degrees | 36 Degrees | 60 Degrees | 204 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi S8921B (Stock) | 21 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 81.5 Degrees | 163 Degrees | 32 Degrees | 63 Degrees | 195 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Toro Nero (Stock) | 21 | 15.88x17.60 | 67 Degrees | 134 Degrees | 67 Degrees | 134 Degrees | 82 Degrees | 164 Degrees | 32 Degrees | 64 Degrees | 212 Degrees | Notes ((The Novarossi Toro Nero features a new and previously unused locking mechanism for the cylinder liner in the engine casing. The locking pin is not located at the front or rear, but rather on the left side when viewed from the front. The bore/stroke ratio is also unusual: resulting in an extremely long stroke engine. Another notable feature is the crankshaft, which is balanced once and has a diameter of 14.5mm. This necessitates new ball bearings, not the front bearings, but the main bearing. The front bearing is the new 7x19x6 bearing with both seals facing outwards, featuring a plastic cage. The main bearing now measures 14.5x26x5.7mm. The crankshaft is also hollow-drilled, but unfortunately not potted with silicone, which does not allow for optimal intake of the fresh air/fuel mixture.)) | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Toro Nero Team (Stock) | 21 | 15.88x17.60 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 82+85 Degrees | 164+170 Degrees | 31 Degrees | 64 Degrees | 213 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 LC/WC Cordoba Edition (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 91 Degrees | 182 Degrees | 34 Degrees | 63 Degrees | 209 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi TS1 (Stock) | 12 | 00.00x00.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 87 Degrees | 174 Degrees | 35 Degrees | 56 Degrees | 201 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N12T1 (Stock) | 12 | 00.00x00.00 | 57 Degrees | 114 Degrees | 57 Degrees | 114 Degrees | 84 Degrees | 168 Degrees | 35 Degrees | 56 Degrees | 201 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi NSR12S3 (Stock) | 12 | 00.00x00.00 | 58 Degrees | 116 Degrees | 58 Degrees | 116 Degrees | 79.5 Degrees | 159 Degrees | 26 Degrees | 70 Degrees | 224 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 353 Race (Stock) | 12 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 86.5 Degrees | 173 Degrees | 35 Degrees | 66 Degrees | 211 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Rex BR21SB01 (Stock) | 21 | 00.00x00.00 | 58 Degrees | 116 Degrees | 58 Degrees | 116 Degrees | 78 Degrees | 156 Degrees | 39 Degrees | 66 Degrees | 207 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Rex 12 (unknown model) (Stock) | 12 | 00.00x00.00 | 58 Degrees | 116 Degrees | 58 Degrees | 116 Degrees | 78 Degrees | 156 Degrees | 33 Degrees | 58 Degrees | 205 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Rex 350 (Stock) | 21 | 0x0 | 67 Degrees | 134 Degrees | 67 Degrees| 134 Degrees | 89 Degrees | 178 Degrees | 26 Degrees | 67 Degrees | 221 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 Collari Cordoba (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 91 Degrees | 182 Degrees | 33 Degrees | 64.5 Degrees | 211.5 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 2009 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 35 Degrees | 62 Degrees | 207 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 2015 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 91 Degrees | 182 Degrees | 34 Degrees | 64.5 Degrees | 210.5 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 2016 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 34 Degrees | 64 Degrees | 210 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 2019 (Black Head) (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 35 Degrees | 64 Degrees | 209 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 21R-PTAN (RB Style Head) (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 32 Degrees | 63 Degrees | 211 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Flash 21 Tuned 2009 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 97 Degrees | 194 Degrees | 34.5 Degrees | 64.5 Degrees | 210 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Flash 21 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 94 Degrees | 184 Degrees | 34 Degrees | 64 Degrees | 210 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-5T 2010 Blue Head (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92.5 Degrees | 185 Degrees | 35 Degrees | 58 Degrees | 203 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-5T 2011 AMCA Club (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 91 Degrees | 182 Degrees | 32 Degrees | 62 Degrees | 210 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-5T 2012 1 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 31 Degrees | 63 Degrees | 212 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-5T 2012 2 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 32 Degrees | 64 Degrees | 212 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-3T 2012 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 81 Degrees | 162 Degrees | 44 Degrees | 52 Degrees | 188 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Brave (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 86 Degrees | 192 Degrees | 32 Degrees | 63 Degrees | 211 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi N21-7T Blue Head (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 39 Degrees | 54 Degrees | 195 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Volksmotor 9 Port (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 93 Degrees | 186 Degrees | 31 Degrees | 62 Degrees | 211 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Virtus (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 92 Degrees | 184 Degrees | 29 Degrees | 65.5 Degrees | 216.5 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi 35Plus21 WC 2017 (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 64 Degrees| 130 Degrees | 90+94 Degrees | 180+188 Degrees | 30 Degrees | 69 Degrees | 219 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Keep On (Stock) | 21 | 0x0 | 65 Degrees | 130 Degrees | 65 Degrees| 130 Degrees | 90 Degrees | 180 Degrees | 35 Degrees | 65 Degrees | 210 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | | Novarossi Mito 9 Rallye (Stock) | 21 | 0x0 | 63 Degrees | 126 Degrees | 63 Degrees| 126 Degrees | 90+94 Degrees | 180+188 Degrees | 29 Degrees | 70 Degrees | 221 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== Ofna ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Ofna Force Blue 21 (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 80 Degrees | 160 Degrees | 32 Degrees | 54 Degrees | 202 Degrees | N/A | | Ofna Hyper 21 3P (Stock) | 21 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 83.5 Degrees | 167 Degrees | 40 Degrees | 55 Degrees | 195 Degrees | N/A | ===== OPS ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | OPS 21RE On Road (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 89 Degrees | 178 Degrees | 36 Degrees | 59 Degrees | 203 Degrees | N/A | | OPS 21 Off Road (Stock) | 21 | 00.00x00.00 | 66.5 Degrees | 133 Degrees | 66.5 Degrees | 133 Degrees | 91.5 Degrees | 183 Degrees | 34 Degrees | 63 Degrees | 209 Degrees | N/A | | OPS SFV-21V (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 88 Degrees | 176 Degrees | 33 Degrees | 66 Degrees | 213 Degrees | N/A | ===== Orcan ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Orcan PR115 (Stock) | 15 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 82 Degrees | 164 Degrees | 49 Degrees after BDC | 43 Degrees after TDC | 174 Degrees | N/A | ===== OS Max ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | OS Max 18 CV-R (Stock) | 18 | 00.00x00.00 | 55 Degrees | 110 Degrees | 55 Degrees | 110 Degrees | 80 Degrees | 160 Degrees | 37 Degrees | 61 Degrees | 204 Degrees | N/A | | OS MAX 18 TZ/P (Stock) | 18 | 00.00x00.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 81 Degrees | 162 Degrees | 34 Degrees | 58 Degrees | 204 Degrees | N/A | | OS Max 21 VZ-B (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 85 Degrees | 170 Degrees | 37 Degrees | 66 Degrees | 209 Degrees | N/A | | OS Max 21 VZ-B V-SPEC (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 86 Degrees | 172 Degrees | 30 Degrees | 71 Degrees | 221 Degrees | N/A | | OS Max 21XM Outboard Rev Rot (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 80.5 Degrees | 161 Degrees | 40 Degrees | 61 | 201 Degrees | N/A | | OS Max 21 XZ-B (Stock) | 21 | 00.00x00.00 | 62 Degrees | 124 Degrees | 62 Degrees | 124 Degrees | 86 Degrees | 172 Degrees | 35 Degrees | 65 Degrees | 210 Degrees | N/A | | OS Max 25 XZ (Stock) | 25 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 85 Degrees | 170 Degrees | 34 Degrees | 63 Degrees | 209 Degrees | N/A | | OS Max 28 XZ (Stock) | 28 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 88 Degrees | 176 Degrees | 35 Degrees | 65 Degrees | 210 Degrees | N/A | ===== OS Speed ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | OS SPEED 12 TZ (Stock) | 12 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 94 Degrees | 188 Degrees | 31 Degrees | 63 Degrees | 212 Degrees | N/A | | OS SPEED 21 VZ-B VSPEC II (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 86 Degrees | 172 Degrees | 29 Degrees | 68 Degrees | 219 Degrees | N/A | ===== Picco ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Picco P3 .26 (Stock) | 26 | 00.00x00.00 | 58 Degrees | 116 Degrees | 58 Degrees | 116 Degrees | 82 Degrees | 164 Degrees | 36 Degrees | 54 Degrees | 198 Degrees | N/A | | Picco P3 .28 (Stock) | 28 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 85 Degrees | 170 Degrees | 37 Degrees | 59 Degrees | 202 Degrees | N/A | | Picco-Mega ZX21 Circuit (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 90 Degrees | 180 Degrees | 29 Degrees | 62 Degrees | 213 Degrees | N/A | | Picco P7-S (P7-8080) (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 86 Degrees | 172 Degrees | 29 Degrees | 59 Degrees | 210 Degrees | N/A | | Picco P7-R (P7-8502) (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 87 Degrees | 173 Degrees | 40 Degrees | 61 Degrees | 202 Degrees | N/A | | Picco P7-R Evo2 (P7-8502) (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 86.5 Degrees | 173 Degrees | 40 Degrees | 59 Degrees | 199 Degrees | N/A | | Picco P7-R Evo3 Onroad (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 89 Degrees | 178 Degrees | 37 Degrees | 57 Degrees | 200 Degrees | N/A | | Picco 21 Boost (Stock) | 21 | 00.00x00.00 | 61 Degrees | 122 Degrees | 56 Degrees | 112 Degrees | 82+86 Degrees | 164+171 Degrees | 34 Degrees | 58 Degrees | 204 Degrees | N/A | ===== RB Concept ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | RB Concept Blast Buggy (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 79+85.5 Degrees | 158+171 Degrees | 40 Degrees | 54 Degrees | 194 Degrees | N/A | | RB Concept C6BB T7 (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 87 Degrees | 174 Degrees | 40 Degrees | 60 Degrees | 200 Degrees | Note ((C6BB + C6BB T7 The exhaust timing of these two engines is unique in that, although symmetrical, it still has two different timings. The engine features the so-called MES (Multi-Exhaust System), which means that the exhaust port is divided into three channels: a large main exhaust port in the center and two smaller exhaust ports on either side. This system was previously used in the C5 engine, although in that case all the ports were at the same height. With the C6BB and C6BB T7, this is different. The smaller exhaust ports only close at a crankshaft angle of 180° (C6BB 90°+90°, as the valve timing of the cylinder liner is always symmetrical!) and 174° (C6BB T7), while the main exhaust port closes at 160° (80°+80°, both engines). This means the main port remains closed longer after combustion. (Always starting from a 0° angle when the piston is at bottom dead center!) This promises a significant increase in torque without sacrificing engine speed.)) | | RB Concept C6BB Buggy (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 90 Degrees | 180 Degrees | 40 Degrees | 60 Degrees | 200 Degrees | Note ((C6BB + C6BB T7 The exhaust timing of these two engines is unique in that, although symmetrical, it still has two different timings. The engine features the so-called MES (Multi-Exhaust System), which means that the exhaust port is divided into three channels: a large main exhaust port in the center and two smaller exhaust ports on either side. This system was previously used in the C5 engine, although in that case all the ports were at the same height. With the C6BB and C6BB T7, this is different. The smaller exhaust ports only close at a crankshaft angle of 180° (C6BB 90°+90°, as the valve timing of the cylinder liner is always symmetrical!) and 174° (C6BB T7), while the main exhaust port closes at 160° (80°+80°, both engines). This means the main port remains closed longer after combustion. (Always starting from a 0° angle when the piston is at bottom dead center!) This promises a significant increase in torque without sacrificing engine speed.)) | | RB Concept C5BB Buggy (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 88 Degrees | 176 Degrees | 42 Degrees | 61 Degrees | 199 Degrees | N/A | | RB Concept C5 Buggy (June 2002) (Rody) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 90 Degrees | 180 Degrees | 35 Degrees | 60 Degrees | 205 Degrees | N/A | | RB Concept C5 Circuit (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 87 Degrees | 174 Degrees | 31 Degrees | 60 Degrees | 209 Degrees | N/A | | RB Concept S5 Buggy (Oct 2007) (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 85.5 Degrees | 171 Degrees | 40 Degrees | 51 Degrees | 191 Degrees | N/A | | RB Concept K12 (Stock) | 12 | 00.00x00.00 | 57 Degrees | 114 Degrees | 57 Degrees | 114 Degrees | 79 Degrees | 158 Degrees | 42 Degrees | 49 Degrees | Degrees | 187 N/A | | RB Concept S7II (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 88 Degrees | 176 Degrees | 43 Degrees | 50 Degrees | 187 Degrees | N/A | | RB Concept TJ9 (Stock) | 21 | 00.00x00.00 | 56 Degrees | 112 Degrees | 56 Degrees | 112 Degrees | 83.5 Degrees | 171 Degrees | 35 Degrees | 55 Degrees | 200 Degrees | N/A | | RB Concept WS7II (Stock) | 21 | 00.00x00.00 | 67 Degrees | 134 Degrees | 67 Degrees | 134 Degrees | 89 Degrees | 178 Degrees | 42 Degrees | 55 Degrees | 193 Degrees | N/A | | RB Concept WS7III (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 88 Degrees | 176 Degrees | 50 Degrees | 52 Degrees | 192 Degrees | N/A | | RB Concept WS9(Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 82 Degrees | 164 Degrees | 44 Degrees | 51 Degrees | 187 Degrees | N/A | | RB Concept TM728 Monster (Stock) | 28 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 82 Degrees | 164 Degrees | 49 Degrees | 50 Degrees | 181 Degrees | N/A | | RB Concept H9 (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 86.5 Degrees | 173 Degrees | 40 Degrees | 53 Degrees | 193 Degrees | N/A | | RB Concept Shark 9 (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 82+92 Degrees | 164+184 Degrees | 40 Degrees | 59 Degrees | 199 Degrees | N/A | | RB Matrix (Stock) | 21 | 00.00x00.00 | 58 Degrees | 116 Degrees | 58 Degrees | 116 Degrees | 85 Degrees | 170 Degrees | 37 Degrees | 70 Degrees | 213 Degrees | N/A | | RB Concept USA (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 86 Degrees | 172 Degrees | 41 Degrees | 52 Degrees | 191 Degrees | N/A | ===== RS Falcon ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | RS Falcon FA21-B5 (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 87 Degrees | 174 Degrees | 29 Degrees | 60 Degrees | 211 Degrees | N/A | | RS Falcon FA21-R7 Rally (Stock) | 21 | 00.00x00.00 | 66.5 Degrees | 133 Degrees | 66.5 Degrees | 133 Degrees | 94 Degrees | 188 Degrees | 28 Degrees | 60 Degrees | 212 Degrees | N/A | | RS Falcon VZB VSPEC (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 84 Degrees | 168 Degrees | 29 Degrees | 71 Degrees | 222 Degrees | N/A | ===== SH Engines ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | SH 28 (Stock) | 28 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 83 Degrees | 166 Degrees | 37 Degrees | 50 Degrees | 193 Degrees | N/A | | SH Truggster 28 (Stock) | 28 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 87 Degrees | 174 Degrees | 27 Degrees | 57 Degrees | 210 Degrees | N/A | ===== Sirio ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Sirio Kanai 21 CL3B (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 85 Degrees | 170 Degrees | 30 Degrees | 65 Degrees | 215 Degrees | N/A | | Sirio Kanai 21 Evo2 (Stock) | 21 | 00.00x00.00 | 67 Degrees | 134 Degrees | 67 Degrees | 134 Degrees | 88 Degrees | 176 Degrees | 33 Degrees | 61 Degrees | 208 Degrees | N/A | | Sirio Kanai S21BK Evo4 (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 84 Degrees | 168 Degrees | 30 Degrees | 69 Degrees | 219 Degrees | N/A | | Sirio Kanai S21BK Evo4 STI (Stock) | 21 | 00.00x00.00 | 64 Degrees | 128 Degrees | 64 Degrees | 128 Degrees | 85.5 Degrees | 171 Degrees | 33 Degrees | 63 Degrees | 210 Degrees | N/A | | Sirio S21 BXTIS (Stock) | 21 | 00.00x00.00 | 66 Degrees | 132 Degrees | 66 Degrees | 132 Degrees | 87 Degrees | 174 Degrees | 35 Degrees | 62 Degrees | 207 Degrees | N/A | | Sirio 27 Monster 3 Port (Stock) | 27 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 82 Degrees | 164 Degrees | 34 Degrees | 60 Degrees | 206 Degrees | Notes ((SIRIO .27 3-Channel Monster. This engine is available in the same size as both a 3-channel and a 7-channel version. Anyone who thinks the only difference is the running gear is sadly mistaken! The 3-port engine has a completely different crankshaft than the 7-port engine. It's clear that significant rework is possible. While casting the crankshaft isn't necessary for the 7-port engine, it's definitely recommended for the 3-port engine, as it's evident that it was produced more cheaply and with less attention to detail. Furthermore, the Sirio website shows the 3-port engine with an aluminum carburetor, which is no longer accurate, as it now uses a plastic compound carburetor. There are also two versions of the 7-port engine: one with a pull starter and one for a starter box. The difference lies in the fact that the Pro engine doesn't have a pull starter and consequently has a different rear cover and a different crankshaft, which, apart from the drive pin for the pull starter, is identical to the 7-port pull-start engine.)) | | Sirio 28 STI Monster (Stock) | 28 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 84 Degrees | 168 Degrees | 35 Degrees | 62 Degrees | 207 Degrees | Notes ((Sirio .28 STI Monster. What struck me about this engine is that it essentially only uses the casing from the Sirio Kanai EVOII 3.5cc class. Only the casing was bored out slightly! The cylinder liner is therefore relatively thin-walled, but overall it makes a very good impression. Regarding the issue of the piston pin circlips repeatedly coming loose and causing engine damage, I noticed that the groove in which the circlip sits looks very deformed. It's possible, of course, that the tool used to manufacture the groove had already reached or even exceeded its maximum lifespan, or perhaps was damaged unnoticed, so that a certain series of engines were produced with this defect before the standard tool change. The rework isn't great, but the deformed areas prevent the circlip from engaging precisely. A lost circlip is therefore almost inevitable. However, it should be sufficient to remove the burr in the groove and reinstall the circlip. However, it's not easy for someone who doesn't own a microscope or at least a magnifying glass of that size --beyond good and evil-- Also noticeable is the huge gap of 0.85mm (normally everything between 0.6 and 0.7mm with 25% nitro); here, with poor adjustability, you might be able to remove 2/10ths.)) | ===== Tecnopower ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Tecnopower B01 (Stock) | 21 | 00.00x00.00 | 65 Degrees | 130 Degrees | 65 Degrees | 130 Degrees | 87 Degrees | 174 Degrees | 30 Degrees | 60 Degrees | 210 Degrees | N/A | ===== Traxxas ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Traxxas TRX 2.5R (Stock) | 15 | 00.00x00.00 | 60 Degrees | 120 Degrees | 60 Degrees | 120 Degrees | 77 Degrees | 154 Degrees | 36 Degrees | 52 Degrees | 196 Degrees | N/A | ===== Thunder Tiger ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Thunder Tiger Pro 21R 13mm Crank (Stock) | 21 | 00.00x00.00 | 60 Degrees | 120 Degrees | 60 Degrees | 120 Degrees | 80 Degrees | 160 Degrees | 38 Degrees | 51 Degrees | 193 Degrees | Note ((Thunder Tiger PRO 21R. Please note that there are different versions of this engine. While the TTR engines in the Pro21R series share the same designation on the casing, they have different cylinder heads and crankshafts with diameters of 13 and 14 mm. This results in different valve timing for each engine. Consequently, differences in running characteristics, performance, and fuel consumption may occur.)) | | Thunder Tiger Pro 21R 14mm Crank (Stock) | 21 | 00.00x00.00 | 63 Degrees | 126 Degrees | 63 Degrees | 126 Degrees | 79 Degrees | 158 Degrees | 33 Degrees | 56 Degrees | 203 Degrees | Note ((Thunder Tiger PRO 21R. Please note that there are different versions of this engine. While the TTR engines in the Pro21R series share the same designation on the casing, they have different cylinder heads and crankshafts with diameters of 13 and 14 mm. This results in different valve timing for each engine. Consequently, differences in running characteristics, performance, and fuel consumption may occur.)) | | Thunder Tiger Pro 28 (Stock) | 28 | 00.00x00.00 | 56 Degrees | 112 Degrees | 56 Degrees | 112 Degrees | 78 Degrees | 156 Degrees | 30 Degrees | 58 Degrees | 208 Degrees | N/A | ===== Team Orion ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ | Team Orion CRF 21 Team Orion (Stock) | 21 | 00.00x00.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 88.5 Degrees | 177 Degrees | 32 Degrees | 58 Degrees | 206 Degrees | N/A | | Team Orion CRF 21 Team Orion USA (Stock) | 21 | 00.00x00.00 | 59 Degrees | 118 Degrees | 59 Degrees | 118 Degrees | 87 Degrees | 174 Degrees | 37 Degrees | 54 Degrees | 197 Degrees | N/A | | Team Orion Wasp 28 (Stock) | 28 | 00.00x00.00 | 61 Degrees | 122 Degrees | 61 Degrees | 122 Degrees | 87 Degrees | 174 Degrees | 42 Degrees | 56 Degrees | 194 Degrees | N/A | ===== USE ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | USE La Turbie (Stock) | 21 | 0x0 | 70 Degrees | 140 Degrees | 64 Degrees| 128 Degrees | 92 Degrees | 184 Degrees | 22 Degrees | 66 Degrees | 223 Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] | ===== DEV ===== ^ Engine ^ Size ^ Bore x Stroke (mm) ^ Boost Timing Open ATDC ^ Boost Duration ^ Transfer Timing Open ATDC ^ Transfer Duration ^ Exhaust Timing Open ATDC ^ Exhaust Duration ^ Crank Rotor Open ABDC ^ Crank Rotor Close ATDC ^ Rotor Duration ^ Notes ^ Diagram ^ | Engine (Stock) | 21 | 0x0 | BO Degrees | BD Degrees | TO Degrees| TD Degrees | EO Degrees | ED Degrees | RO Degrees | RC Degrees | RD Degrees | N/A | [[http://nitroenginewiki.com/images/osspeed13893/13893_13894_OSS_21VSpec.pdf|Click]] |