| Engine | Bolt Holes | Friction diameter (mm) | Weight (kg) |
| 2Ac | 6 | 200 | - |
| 3Ac | 6 | 200 | - |
| 4Ac | 6 | 200 | 9.3kg Thanks to Benny/ Moppitt (Toymods) for this info |
| 4AGE big-port | 8 | 200 | - |
| 4AGE small-port | 8 | 212 | - |
| 4AGZE big-port | 8 | 225 or 230 | - |
| 4AGZE small-port | 8 | 225 or 230 | - |
| 4AGE 20V Silver | 8 | 212 | 6.9 Thanks to Mr Accoustic for this info |
| 4AGE 20V Black | 8 | 212 | 5.9 Thanks to Mr Accoustic for this info |
| 7AFE | 6 | 212 | - |