Enter your injector flow rate in either lb/hr or cc/min, choose your conversion direction, and the Fuel Injector Flow Rate Converter gives you the converted flow rate plus the formula used so you know exactly how the math works.
Converted Flow Rate
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Formula Used
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Fuel injector flow rates determine how much fuel can flow through an injector within a specific time period. They're crucial for proper engine calibration, performance tuning, and ensuring your engine gets the right amount of fuel for optimal performance and efficiency.
To convert pounds per hour to cubic centimeters per minute, multiply the lb/hr value by 10.5. For example, 35 lb/hr × 10.5 = 367.5 cc/min. This is the standard conversion factor used in the automotive industry.
To convert cubic centimeters per minute to pounds per hour, divide the cc/min value by 10.5. For example, 420 cc/min ÷ 10.5 = 40 lb/hr. This reverse conversion uses the same 10.5 factor.
Generally, you need about 0.5-0.65 lb/hr per horsepower depending on your engine type. Naturally aspirated engines typically use 0.45-0.50, supercharged engines 0.55-0.60, and turbocharged engines 0.60-0.65 lb/hr per horsepower.
Different regions prefer different units: lb/hr is commonly used in North American markets, while cc/min is popular in European and Asian markets. Both measure the same thing - how much fuel flows through the injector over time.
Flow rates are affected by fuel pressure, fuel temperature, injector duty cycle, and the specific gravity of the fuel being used. Higher pressure increases flow, while temperature and fuel type can also impact the actual flow rate.
You can use larger injectors, but they may affect idle quality and low-speed drivability. Oversized injectors make it harder to control small fuel quantities at low engine loads, potentially causing rough idle or poor fuel economy.