πŸ”§ Compression Ratio Calculator

Calculate horsepower changes from compression ratio modifications

Compression Ratio Calculator

Calculate horsepower changes from compression ratio modifications with professional accuracy

Enter your engine's current power output

Your engine's current compression ratio

Target compression ratio after modification

Quick Select
Common Ratios
Low Performance
8:1

Truck/economy engines

Mild Street
9:1

Pump gas friendly

Street Performance
9.5:1

Good balance

High Performance
10.5:1

Premium fuel recommended

Race
12:1

Race fuel required

Pro Race
14:1

Extreme performance

⚑Compression Ratio Effects

πŸ“ˆBenefits of Higher Compression

β€’Increased power output (3-4% per point)
β€’Better thermal efficiency
β€’Improved throttle response
β€’More complete fuel combustion

⚠️Risks of High Compression

β€’Requires higher octane fuel
β€’Risk of detonation/knock
β€’Increased combustion pressure
β€’May need timing adjustments

β›½Fuel Requirements

Regular Gas (87 octane)
8.0-9.0:1

Safe for most stock engines and daily drivers

Premium Gas (91-93 octane)
9.5-11.0:1

Required for high performance applications

Race Fuel (100+ octane)
11.0+:1

Necessary for extreme compression ratios

How to Use

1. Enter current compression ratio

2. Input desired compression ratio

3. View horsepower change percentage

4. Consider fuel octane requirements

Features

βœ“ Compression ratio analysis

βœ“ Horsepower change calculations

βœ“ Fuel octane recommendations

βœ“ Engine performance optimization