Injector Size Calculator
Calculate the optimal fuel injector size for your engine based on horsepower, fuel type, and target air/fuel ratio. Ensure proper fueling for performance builds.
Step 1: Engine Details
Understanding Fuel Injector Sizing
Proper injector sizing is critical for engine performance and reliability. Too small injectors will limit power, while too large injectors can cause poor idle and driveability issues.
Step 2: Fuel System Details
About Duty Cycle
Duty cycle represents the percentage of time an injector is open during an engine cycle. For reliability, aim for 80-85% maximum duty cycle to allow headroom for variations in fuel demand.
Fuel Injector Sizing Results
Recommended Injector Size
Common Injector Sizes
| Injector Size | lb/hr | cc/min | Typical HP Support | Application |
|---|
Injector Flow Rate Analysis
Injector Sizing Formula
Injector Size = (HP × BSFC) / (Cylinders × Duty Cycle)
Fuel injector sizing is calculated based on the engine’s horsepower, brake specific fuel consumption (BSFC), number of cylinders, and the desired injector duty cycle. Actual requirements may vary based on fuel type, forced induction, and specific engine characteristics.
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