Engine Features

The grey cast iron crankcase possesses exceptional torsional rigidity, yet is approximately 5 percent lighter than the M20 crankcase. The cylinder bores are siamesed (cast together in pairs) using the same design principles as on the M20 engine.



The crankshaft is a spheroidal graphite casting supported by seven main bearings with 12 counterweights. Precise design measures have reduced the crankshaft weight of the M50 by approximately 3 kg (6.5 lbs.) compared to the M20.



The piston crowns incorporate a symmetrical combustion bowl and are notched for valve head clearance. Oil jets mounted in the main bearing oil supply spray oil into the underside of the piston crown for piston cooling.


The forged connecting rod has been redesigned to reduce weight by 10 grams compared to the M20 which promotes a smooth running engine and ensures reliable operation even at higher speeds.