Engine Stat is a term used to describe the performance of an engine. REVS (4 letters) stands for revolutions per minute, which is the number of times an engine's crankshaft rotates in one minute. RPM (3 letters) stands for rotations per minute, which is the same as REVS. RPMS (4 letters) stands for revolutions per minute per second, which is the rate at which an engine's crankshaft rotates in one second.