Compression Ratio Effect Calculator
Understand how compression ratio changes affect engine power, efficiency, and fuel requirements.
Compression Ratio Effects
Current Thermal Efficiency
60.2%
Target Thermal Efficiency
62.4%
Efficiency Change
+3.60%
Power Change
+3.8%
Estimated New Power
311 HP
(+11 HP)
Effective CR (with boost)
11.5:1
Minimum Octane Required
91
Octane Margin
+0 points
Detonation Risk
Moderate - Careful tuning needed
Modification Method
Complete piston and/or head replacement
Compression Ratio Guidelines
- Street NA Engines: 10-11:1 with premium fuel is a good balance
- Race NA Engines: 12-14:1 possible with race fuel
- Boosted Engines: 8.5-9.5:1 typical for high boost applications
- Optimal Range: 9-13:1 for gasoline engines