Is It Harmful to Rev the Engine in Neutral Gear?

1 Answers
PeterLee
07/30/25 3:39am
Revving the engine in neutral gear is harmful. Impact on engine reliability and lifespan: When the car is in neutral gear, the engine has no power output. At this time, revving the throttle causes the engine speed to rise sharply. Moving parts such as pistons and connecting rods undergo rapid acceleration, generating significant acceleration forces and subjecting them to substantial alternating loads. The forces on pistons, piston pins, connecting rods, connecting rod bolts, and crankshafts will exceed those during normal operation, affecting the engine's reliability and lifespan. Cylinder scuffing and bearing seizure failures: Due to the sharp increase in engine speed when revving, lubrication at various friction pairs cannot keep up, making it highly prone to cylinder scuffing, bearing seizure, and other failures.
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