Other crankshaft angles have been used occasionally. A balance shaft is sometimes used to reduce the vibrations caused by the rocking couple. Another benefit of this configuration is perfect primary balance and secondary balance, however an end-to-end rocking couple is induced because there is no symmetry in the piston velocities about the middle piston. Less common than straight-four engines, straight-three engines have nonetheless been used in various motorcycles, cars and agricultural machinery.ĭesign four stroke Straight-three engine with firing order 1-3-2Ī crankshaft angle of 120 degrees is typically used by straight-three engines, since this results in an evenly spaced firing interval. Type of engine Engine block of an Elsbett straight-three diesel engineĪ straight-three engine (also called an inline-triple or inline-three) is a three-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.
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