1976-02-01

A Low Vibration Engine with Unique Counter-Balance Shafts 760111

Subcompact cars generally use 4-cylinder engines, because of their advantages over 6-cylinder or 8-cylinder engines in production cost, engine size, weight, combustion efficiency, emission control, etc. The 4-cylinder engine, however, has an inherent shortcoming of second order vibration in the vertical and rolling directions, originating from the reciprocating masses and explosions in the engine.A new in-line 4-cylinder engine with its vibration reduced to a level comparable to the 6-cylinder engine or rotary engine has been recently developed while retaining the advantages mentioned above. The engine incorporates a unique balancing system, which reduces the booming to a minimum in the vehicle passenger compartment.

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