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Exhaust Pipe Diameter Calculator
Suggest an exhaust pipe diameter from engine size, revs and volumetric efficiency.
wrench Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Suggested pipe diameter
Compare Your Options And Get Clear Answers
Suggest an exhaust pipe diameter from engine size, revs and volumetric efficiency.
Exhaust Pipe Diameter Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Area = Q / velocity.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Exhaust Quick Guide
Typical values for reference.
| cc | rpm | VE % | Diameter |
|---|---|---|---|
| 2000 | 6000 | 90 | 66 mm |
| 1000 | 6500 | 85 | 47 mm |
| 3000 | 6000 | 95 | 82 mm |
| 5000 | 6500 | 100 | 114 mm |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Exhaust Pipe Diameter Calculator FAQ
Answers to common questions about this calculator.
Match pipe area to hot gas flow at a sensible velocity.
No, oversize pipes lose velocity and low-end torque.
Yes, turbo engines flow more.
It is a starting estimate.