🔧 Carburetor CFM Calculator
Calculate the correct carburetor CFM for your engine based on displacement and modification level
CFM Calculator
Calculate the required carburetor CFM for your engine displacement and configuration
Carburetor Selection Guide
Stock Engine Multiplier (1.618)
- • Factory or mildly modified engines
- • Stock camshaft and heads
- • Emphasis on drivability and fuel economy
- • Conservative CFM requirements
Street & Strip Multiplier (1.76)
- • Modified performance engines
- • Aftermarket cam, heads, or intake
- • Headers and performance exhaust
- • Higher CFM for maximum power
Carburetor Types
Vacuum Secondary
Better for street driving, opens secondaries based on engine vacuum. More forgiving and provides better fuel economy.
Mechanical Secondary
Better for racing, opens secondaries mechanically with throttle. Provides maximum airflow but requires proper tuning.
How to Use
1. Enter engine displacement in cubic inches
2. Select engine type (stock or modified)
3. View calculated CFM requirements
4. Use result to select appropriate carburetor
Features
✓ Stock and modified engine calculations
✓ CFM per cubic inch ratios
✓ Carburetor sizing recommendations
✓ Performance optimization guidance