# Engine Systems
## Air-Cooled Flat-Four
### Early (Type 1)
- 1131cc 25 HP
- 25 HP @ 3,200 RPM
### Later (Type 1)
- 1285cc 34 HP
- 34 HP @ 3,400 RPM
### 1302/1303
- 1600cc 48 HP
- 48 HP @ 4,000 RPM
## Key Features
- Air-cooled by fan
- Fuel injection (later)
- Generator/starter combined
## Fan Housing
- Dynamic cooling
- Radial fan
Specifications
Displacement1131cc - 1600cc
ConfigurationFlat 4, Air Cooled
Valve TrainSidevalve / OHV
Fuel SystemCarburetor / Fuel Injection
Oil Capacityquarts