Engine Tuning & Builder

Calculate important engine, fuel, boost, gearing, valvetrain, compression, and performance values from one convenient app. Whether you are checking displacement, comparing gear ratios, estimating injector size, working with turbo boost, or planning camshaft and engine geometry changes, the app helps you work through the numbers quickly.

Included calculators and tools cover:
- Engine displacement, bore, stroke, clearance volume, and compression ratio
- Horsepower from torque and torque from horsepower
- HP and kW conversion
- Mean piston speed
- Dynamic compression ratio and estimated compression pressure
- Injector size and supported horsepower
- Fuel flow and injector flow changes with fuel pressure
- AFR and lambda conversion
- Boost pressure ratio and absolute pressure
- Naturally aspirated and boosted airflow estimates
- Turbo airflow, compressor matching, and outlet temperature
- Intercooler efficiency
- Supercharger drive ratio and pulley sizing
- Tire diameter, road speed, RPM, and overall gearing
- RPM after a gear change
- Cam duration, overlap, centerline, and intake valve closing
- Valve lift, rocker ratio, curtain area, and valve-to-bore calculations
- Carburetor CFM, jet area, and venturi sizing
- Intake runner, velocity stack, and exhaust primary calculations
- Rod-to-stroke ratio, compression height, and deck clearance
- Piston ring gap and piston-to-valve geometry
- Crankshaft bobweight and flywheel rotational energy
- Clutch torque capacity
- Coolant mixture calculations
- Ignition and crank-angle calculations
- 2-stroke port timing, port height, blowdown, tuned pipe, squish, and expansion chamber calculations
- Percent change and other useful tuning utilities

Each calculator includes clear inputs, calculated results, formulas, and supporting information to help explain what the numbers mean. The built-in Guide/Formulas section provides additional reference information for the available calculations, so you can review the formula and its practical use without needing a separate reference.

Search makes it easy to quickly find the calculator or formula you need. The app also includes unit conversions where applicable and visual diagrams for selected calculations.

Useful for naturally aspirated, turbocharged, supercharged, 2-stroke, and performance engine projects.

Engine Tuning & Builder is intended for calculation, planning, comparison, and educational use. Always verify measurements, component specifications, fuel requirements, mechanical clearances, manufacturer limits, emissions requirements, and professional procedures before making engine or tuning changes.

Recent changes:
First Release