Automotive Calculations and Ground Transportation

Calculate dynamic compression ratio from static ratio, stroke, rod length and intake closing, or solve static ratio and closing angle targets.

Engine fuel-system sizing tool Fuel Injector Calculator Size injectors for a horsepower target, estimate supported horsepower from an injector rating, or calculate the required duty cycle. CalculateRequired injector sizeSupported horsepowerRequired duty cycle Pressure unitspsibar Engine and fuel demand Target horsepower Power basisEngine / crank horsepowerWheel horsepower Drivetrain loss (%) Wheel horsepower is divided by the … Read more

Drag racing performance estimator Quarter Mile Calculator Estimate quarter-mile elapsed time and trap speed from race weight and power, estimate power from a measured run, or convert an eighth-mile pass. Calculation Weight and power → quarter-mile estimateQuarter-mile result → horsepower estimate1/8-mile → 1/4-mile estimate Unit system US customary — lb, mphMetric — kg, km/h Vehicle … Read more

Calculate static engine compression ratio from bore, stroke, chamber, gasket, piston and deck measurements, or solve required chamber volume or gasket thickness.

Calculate simple or compound gear ratios, output RPM and torque, or solve vehicle speed, engine RPM and the required axle ratio.