Thestraight-4orinline-4engine(oftenabbreviatedI4orL4)isafourcylinderinternalcombustionenginewithallfourcylindersmountedinastraightlinealongthecrankcase.
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The straight-4 or inline-4 engine (often abbreviated I4 or L4) is a four cylinder internal combustion engine with all four cylinders mounted in a straight line along the crankcase.