This 2003 report covers a detailed design benchmarking study of the BMW IL4 1.8L gasoline engine and includes a photographic record of all the main components, plus individual masses and dimensions. Ricardo comments on specific design features are also included.
This engine has been designed and developed to achieve a step forward in engine efficiency. In order to do this, a complex valve train (‘Valvetronic’) has been designed which allows the engine control unit to vary the inlet valve lift as well as the inlet and exhaust valve timing. The benefit of this is that the engine can be controlled to suit demand in the most efficient way and a throttle is not required for control and hence pumping losses are reduced. The efficiency of this engine gives it comparable performance to direct injection gasoline engines which are currently in production but this engine has the advantage that it is not reliant on sulphur free gasoline in order to achieve acceptable emissions
This engine has a maximum power of 85kW at 5500rpm and a maximum torque of 175Nm at 3750rpm.
- Cylinder Block, Cylinders, Crankcase and Main Bearing Structure
- Connecting Rod, Bearings
- Piston, Pin and Rings, Cylinder Head and Ports
- Camshafts, Valve Train and Cam Cover
- Inlet, Exhaust and Emission Control System