Exhaust Flow Calculator
Exhaust pipe diameter from engine output and RPM.
Inputs
Results
Primary tube OD (in)
0.14
Primary length (in)
12.5
Collector ID (in)0.29
Main pipe ID (in)0.3
Primary area (in²)0.02
Collector area (in²)0.06
Exhaust flow (CFM)960
Total flow area (in²)0.13
How to Use This Calculator
- Enter Horsepower, Peak torque RPM, and Number of cylinders.
- Set Exhaust (1=single, 2=dual) and Target gas velocity (ft/min).
- Review Primary tube OD (in) and Primary length (in).
- Use Collector ID (in) and Main pipe ID (in) to inform your decision.
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