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 decreases considerably, and engines equipped with such a crankshaft usually have a sharp drop in output at 7,000 rpm.
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