121 Inherent engine vibrations

The vibrations originating within the engine are caused by both the cyclic acceleration of the reciprocating components and the rapidly changing cylinder gas pressure which occurs throughout each cycle of operation.

Both the variations of inertia and gas pressure forces generate three kinds of vibrations which are transferred to the cylinder block:

1 Vertical and/or horizontal shake and rock

2 Fluctuating torque reaction

3 Torsional oscillation of the crankshaft

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