Convert fuel injector flow rates from cc/min (cubic centimeters per minute) to lb/hr (pounds per hour). Find the formula, conversion tables, and physical density notes.
Convert cc/min to lb/hr
The Formula for Converting cc/min to lb/hr
To convert volumetric flow rates in cubic centimeters per minute (cc/min) to mass-based flow rates in pounds per hour (lb/hr), use the standard physical conversion factor derived from the typical density of automotive gasoline:
Flow (lb/hr) = Flow (cc/min) ÷ 10.5
If you need to perform the reverse calculation to determine the metric volume rating from the standard mass rate, use this equation:
Flow (cc/min) = Flow (lb/hr) × 10.5
Quick Reference Conversion Table
This table lists common metric fuel injector ratings and their equivalent domestic ratings in pounds per hour (lb/hr), rounded to two decimal places.
| Flow Rate (cc/min) | Equivalent Flow Rate (lb/hr) |
|---|---|
| 200 cc/min | 19.05 lb/hr |
| 250 cc/min | 23.81 lb/hr |
| 300 cc/min | 28.57 lb/hr |
| 350 cc/min | 33.33 lb/hr |
| 440 cc/min | 41.90 lb/hr |
| 550 cc/min | 52.38 lb/hr |
| 650 cc/min | 61.90 lb/hr |
| 850 cc/min | 80.95 lb/hr |
| 1,000 cc/min | 95.24 lb/hr |
Contextual Information & Crucial Factors
Why the Units Differ
Engine fuel demands and injector capacities are represented differently across global markets and engineering teams:
- cc/min (Cubic Centimeters per Minute): This is a volumetric measurement. It describes the physical volume of space the fluid takes up as it passes through the injector nozzle per minute. This unit is standard in Japanese, European, and global aftermarket sectors.
- lb/hr (Pounds per Hour): This is a mass measurement. Because chemical combustion ratios (such as Air-to-Fuel ratio) are calculated by weight/mass rather than volume, American engine builders often prefer working directly with mass flow units to match target engine horsepower goals.
How Fluid Density Affects the Ratio
Because cc/min is volumetric (space) and lb/hr is mass (weight), you cannot directly convert one to the other without defining the weight of the fluid. The standard constant of 10.5 relies on standard gasoline specifications [1]:
- Standard Unleaded Fuel: Carries a specific gravity between 0.72 and 0.74 g/mL, which yields the industry standard conversion ratio of 10.5.
- Heavy Fuels & Alternative Options: If you are working with E85 (ethanol blend), methanol, or diesel, the density changes. E85 has a higher specific gravity (~0.78 g/mL) than standard pump gasoline, meaning an exact mass flow comparison would shift slightly based on the fuel mixture's chemical weight.
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