Engine Horsepower Estimator

Estimate engine horsepower based on displacement, engine type, and configuration.

Displacement

Unit

Engine type

Cylinders

Estimated redline (RPM)

Estimated HP

315

Estimated Torque

283

lb-ft

Specific Output

HP per liter

Naturally Aspirated

Typical: 90 HP/L

Power Band

4,550

Peak torque RPM

5,850

Peak HP RPM

6,500

Redline

Efficiency Estimates

Volumetric85%

Thermal30%

Engine Displacement

Displacement is the total volume swept by all pistons. Larger displacement generally means more power potential, but efficiency varies greatly based on design.

Forced Induction

Turbochargers and superchargers force more air into the engine, allowing more fuel to be burned for more power. Turbos are exhaust-driven; superchargers are belt-driven.

Engine Efficiency

Volumetric efficiency measures how well the engine fills its cylinders with air. NA engines are typically 80-90%, while forced induction can exceed 100% due to pressurized intake.