| Engine name | manufacturer | configuration | cylinders |
|---|---|---|---|
| Merlin III | Rolls-Royce | V | 12 |
| Merlin VIII | Rolls-Royce | V | 12 |
| Merlin X | Rolls-Royce | V | 12 |
| Merlin XII | Rolls-Royce | V | 12 |
| Merlin XX | Rolls-Royce | V | 12 |
| Myojo | Hiro | Radial | 9 |
| Orion I | Bristol | Radial | 9 |
| P.X R | Piaggio | Radial | 9 |
| P.XI C.40 | Piaggio | Radial | 14 |
| P.XI R.2C.40 | Piaggio | Radial | 14 |
| P.XI R.C.100 | Piaggio | Radial | 14 |
| P.XI R.C.100/2v | Piaggio | Radial | 14 |
| P.XI R.C.15 | Piaggio | Radial | 14 |
| P.XI R.C.30 | Piaggio | Radial | 14 |
| P.XI R.C.40 | Piaggio | Radial | 14 |