Description
The solid cheek shafts were primarily developed to improve the pre-compression ratio and thus increase the cylinder charge above the increased pressure in the crankcase. However, the installation of the full cheek shaft greatly reduces the effective cross-section of the intake manifold. As a result, the possible degree of filling in the upper speed range drops considerably, and engines equipped with such a crankshaft usually have a sharp drop in output at 7,000 rpm.
The stroke lengthened by 3mm allows experimentation with timing and provides that little bit of extra displacement. Depending on whether the 3mm is fully compensated with foot or head seals, the motor can be designed for more torque or speed.
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