Fuel & Cooling System

The M1.7 air flow meter is the baffle (door) type and is matched to the engine's specific requirements. As on previous BMW engines, the AFM unit contains an inlet air temperature sensor, requires no adjustment and is maintenance free.



The fuel injectors, fuel rail, cable rail and fuel pressure regulator are mounted to the intermediate intake runner section. This section is adjacent to the intake ports near the intake valves for effective air/fuel mixing.



The cooling system is designed to promote thermal efficiency. Coolant flows vertically up and thru the engine block, thru the cylinder head to the compact vertical-flow radiator.



The 2-stage throttle assembly is coolant heated (de-iced) by a contact type heating element held in place by a bracket. This innovative approach allows a functional check without opening the M42 cooling system.



The M42 cooling system operates with a higher flow capacity than previous BMW 4 cylinder engines due to the new type high output coolant water pump. The temperature regulating thermostat is now rated at 88~C.