Convert fuel injector flow rates from lb/hr (pounds per hour) to cc/min (cubic centimeters per minute). Check the formula, conversion table, and fluid density differences.
Convert lb/hr to cc/min
The Formula for Converting lb/hr to cc/min
To convert mass-based flow rates in pounds per hour (lb/hr) to volumetric flow rates in cubic centimeters per minute (cc/min), the automotive industry uses a standard calculation based on the typical density of gasoline at standard temperature:
Flow (cc/min) = Flow (lb/hr) × 10.5
Conversely, if you need to perform the reverse calculation, use the following equation:
Flow (lb/hr) = Flow (cc/min) ÷ 10.5
Quick Reference Conversion Table
Use this table as a quick comparison guide for popular fuel injector ratings. These values are calculated using the industry-standard 10.5 conversion factor for gasoline.
| Flow Rate (lb/hr) | Equivalent Flow Rate (cc/min) |
|---|---|
| 19 lb/hr | 199.5 cc/min |
| 24 lb/hr | 252.0 cc/min |
| 30 lb/hr | 315.0 cc/min |
| 36 lb/hr | 378.0 cc/min |
| 42 lb/hr | 441.0 cc/min |
| 60 lb/hr | 630.0 cc/min |
| 80 lb/hr | 840.0 cc/min |
| 100 lb/hr | 1,050.0 cc/min |
Contextual Information & Important Variables
Why Do Different Units Exist?
Fuel injector capacities are rated using different metrics depending on regional preferences and engineering practices:
- lb/hr (Pounds per Hour): This mass-based unit is widely used by domestic American manufacturers and tuners. It simplifies Brake Specific Fuel Consumption (BSFC) calculations because engine air-fuel ratios operate on mass, not volume.
- cc/min (Cubic Centimeters per Minute): This volume-based metric unit (equivalent to milliliters per minute) is standard for European, Japanese, and global aftermarket injector manufacturers.
The Variable Role of Fuel Density
Because pounds measure weight (mass) and cubic centimeters measure volume, the exact conversion factor depends directly on the specific gravity (density) of the fluid:
- Standard Gasoline: Has a typical specific gravity of roughly 0.72 to 0.74 g/mL at ambient temperature. Utilizing this range yields the standard industry conversion constant of 10.5.
- Water: Since water is denser than fuel (density of 1.0 g/mL), the conversion multiplier is different. Converting water flow from lb/hr to cc/min yields a constant of approximately 7.56.
- Alternative Fuels (E85 or Methanol): High-performance fuels have different physical densities. If you are tuning specifically for ethanol or methanol, consult your fuel manufacturer's technical specifications for exact chemical weight ratios.
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