Fuel Injector Flow Rate Converter (lb/hr to cc/min)

Fuel injector flow rate is measured in two common units — lb/hr (pounds per hour) and cc/min (cubic centimeters per minute) — and switching between them is necessary when matching injectors across different tuning platforms or spec sheets. Use the Fuel Injector Flow Rate Converter to go in either direction: enter a Flow Rate in lb/hr or cc/min, select your Conversion Direction, and get the Converted Flow Rate in the opposite unit along with the formula used.

Conversion Direction *

lb/hr

Flow rate in pounds per hour

cc/min

Flow rate in cubic centimeters per minute

Results

Converted Flow Rate

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Formula Used

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Results Table

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Frequently Asked Questions

What are fuel injector flow rates and why do they matter?

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.

How do you convert lb/hr to cc/min for fuel injectors?

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.

How do you convert cc/min to lb/hr?

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.

What flow rate do I need for my engine's horsepower?

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.

Why are there two different units for measuring injector flow?

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.

What factors affect fuel injector flow rates?

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.

Can I use larger injectors than recommended?

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.