7 calculators in this category
- Carburetor CFM CalculatorFour-barrel CFM rated at 1.5 inHg, two-barrel at 3.0 inHgA carburettor has to flow the air the engine can actually swallow at peak power — no more, or velocity and signal…
- Fuel Injector Size CalculatorBrake specific fuel consumption methodInjector sizing is a fuel-mass problem, not a horsepower problem: the engine needs a certain mass of fuel per hour to make the…
- Fuel Injector Duty Cycle CalculatorMass fuel flow from BSFC; orifice flow scaling with pressureDuty cycle is the share of each engine cycle an injector spends open. Above roughly 85% an injector starts to lose its ability…
- Air Fuel Ratio & Lambda CalculatorStoichiometric mass air-fuel ratios by fuelAir-fuel ratio only means something once you know which fuel it refers to. 12.5:1 is rich on gasoline, dangerously lean on E85…
- Turbo Pressure Ratio CalculatorU.S. Standard Atmosphere 1976 for ambient pressurePressure ratio is the vertical axis of every compressor map, and it is not the same thing as boost. It is absolute pressure at…
- Turbo Compressor Airflow (lb/min) CalculatorIdeal gas law with R_air = 53.35 ft·lbf/lbm·°RA compressor map has mass flow on one axis and pressure ratio on the other, so choosing a turbo means knowing both numbers for…
- Boost Horsepower Gain CalculatorIdeal-gas charge density method, k = 1.4Boost makes power by raising the density of the air in the cylinder, and density depends on pressure and temperature &mdash…
Which one do you need?
- Carburetor CFM Calculator
- Size a carburetor or throttle body in CFM from displacement, peak rpm and volumetric efficiency, for two-stroke and four-stroke engines alike.
- Fuel Injector Size Calculator
- Size fuel injectors in lb/hr and cc/min from target horsepower, BSFC, injector count and duty cycle, with fuel pressure and E85 density corrections.
- Fuel Injector Duty Cycle Calculator
- Work out injector duty cycle, pulse width and the injection window at any rpm, plus the maximum horsepower your injectors support at 85% duty cycle.
- Air Fuel Ratio & Lambda Calculator
- Convert between air fuel ratio, lambda and equivalence ratio for gasoline, ethanol blends, methanol, diesel and propane, with blended E85 stoichiometry.
- Turbo Pressure Ratio Calculator
- Calculate compressor pressure ratio from target boost, altitude, inlet restriction and intercooler pressure drop, ready to plot on a compressor map.
- Turbo Compressor Airflow (lb/min) Calculator
- Size a turbo from displacement, rpm, VE, boost and charge temperature: mass airflow in lb/min and kg/s, pressure ratio, charge density and supported power.
- Boost Horsepower Gain Calculator
- Estimate boosted horsepower from a naturally aspirated baseline using pressure ratio, compressor efficiency, intercooler effectiveness and charge density.