The crankcase has large longitudinal ventilation holes bored between the lower chambers
of the cylinders. The longitudinal ventilation holes improve the pressure equalization,
between the oscillating air columns that are created in the crankcase, by the up and down
movement of the pistons.
This enhances power by relieving the unwanted pressure that acts against the downward
movement of the pistons. It also enhances crankcase ventilation and adds to oil service
life by promoting the movement of blow-by gasses within the engine.
N55, ventilation holes in crankcase
16
N55 Engine
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