Crank Drive

Crank Drive

Crankcase

The crankcase underwent significant changes in order to reduce internal friction and also lessen the wear on the piston rings. The changes made for the blank part included casting optimization and the addition of reinforcements, resulting in an additional weight of approx. 6.6 lbs (3 kg).

As a further measure, a new method was introduced for cylinder honing, making it possible to further reduce the oil consumption.

Pistons

A change in the production method from casting to forging enabled a weight saving of approx. 1.3 oz (37 g) to be obtained for each piston.







Piston rings

1. piston ring: adopted unchanged
2. piston ring: ring height reduced, angle changed, resulting in lower tangential forces
3. oil wiper ring: ring height reduced, only two-part (was three-part), lower tangential forces and therefore reduced cylinder wear

Crankshaft

The production method for the crankshaft was changed from casting to forging. This made it possible to reduce the weight by approx. 0.9 lbs (0.4 kg).

Vibration balancer

Mounting of the vibration balancer on the crankshaft was modified to permit better handling (lower tightening torques) in the workshop. Seven screws (M10) are used instead of one central screw (M18).