Mechanical Efficiency Calculator
Calculate how much power is lost to internal friction and understand your engine's mechanical efficiency.
Power produced by combustion
Power measured at crankshaft
Mechanical Efficiency Results
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
Friction Loss Breakdown (Estimated)
Piston/Rings
22.5 HP
~45%
Bearings
12.5 HP
~25%
Valvetrain
7.5 HP
~15%
Accessories
7.5 HP
~15%
Improvement Suggestions
- • Low-friction piston rings
- • Synthetic oil with proper viscosity
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.