Engine balancer for a four cylinder in-line internal combustion engine

An engine balancer on a four cylinder in-line engine comprising, a crankshaft rotatably mounted on an axis of rotation, a plurality of main bearings rotatably supporting said crankshaft, a drive end of said crankshaft for the output drive of said crankshaft, a flywheel firmly fixed to said drive end of said crankshaft defining a nodal point of crankshaft torsional vibrations, a plurality of pistons connected through connecting rods driving said crankshaft, and engine balancer centrally mounted relative to said crankshaft including a pair of counterweights eccentrically mounted on axes of rotation parallel to said crankshaft axis, a balancer drive gear directly connected to said crankshaft adjacent one of the main bearings in the low torsional vibration amplitude area on the flywheel side of said balancer near the flywheel and said nodal point of torsional vibrations, driven gear means on the flywheel side of said balancer driven by said drive gear to thereby essentially eliminate transmission of torsional vibration from said crankshaft to said balancer.