Mechanical Efficiency Calculator

Calculate how much power is lost to internal friction and understand your engine's mechanical efficiency.

Indicated Power (HP)

Power produced by combustion

Brake Power (HP)

Power measured at crankshaft

Engine RPM

Oil Temperature (°F)

Engine Type

Mechanical Efficiency

85.7%

Friction Power Loss

50.0 HP

(14.3% of indicated)

Est. FMEP

20.8 psi

Oil Temperature Status

Below optimal - friction slightly higher

Efficiency Rating

Good - Typical modern engine

Piston/Rings

22.5 HP

~45%

Bearings

12.5 HP

~25%

Valvetrain

7.5 HP

~15%

Accessories

7.5 HP

~15%