Calculate the static compression ratio for your engine build. Input cylinder volume, piston displacement, head gasket thickness, and other specifications to determine your compression ratio.
The static compression ratio is the ratio of the total cylinder volume when the piston is at bottom dead center (BDC) to the volume when the piston is at top dead center (TDC). This is calculated without considering cam timing.
Compression ratios vary by engine type and fuel requirements. Higher compression ratios generally produce more power but may require higher octane fuel.
Static compression ratio doesn't account for cam timing. For more accurate results, also calculate dynamic compression ratio which considers when the intake valve closes.
Higher compression ratios require higher octane fuel to prevent detonation. Always verify fuel requirements for your specific engine combination.
Use precise measurements for bore, stroke, and chamber volumes. Small errors can significantly affect compression ratio calculations.
Consider cam timing when planning your build. Aggressive cams can reduce dynamic compression even with high static ratios.
Higher compression generates more heat. Ensure proper cooling and consider thermal management in your build.
Always verify your compression ratio with actual measurements after assembly. Use a burette for accurate chamber volume measurement.