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Bore Stroke Compression Ratio Equation:
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The Bore Stroke Compression Ratio (CR_bsc) is a fundamental parameter in engine design that represents the ratio of the total cylinder volume to the clearance volume. It indicates how much the air-fuel mixture is compressed before ignition.
The calculator uses the compression ratio equation:
Where:
Explanation: The equation calculates the compression ratio by dividing the sum of displacement and clearance volumes by the clearance volume alone.
Details: Accurate compression ratio calculation is crucial for engine performance optimization, fuel efficiency, and preventing engine knocking. Higher compression ratios typically lead to better thermal efficiency but require higher octane fuels.
Tips: Enter both displacement volume and clearance volume in cubic centimeters (cm³). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is a typical compression ratio for gasoline engines?
A: Most modern gasoline engines have compression ratios between 8:1 and 12:1, with higher performance engines reaching up to 14:1.
Q2: How does compression ratio affect engine performance?
A: Higher compression ratios generally improve thermal efficiency and power output, but may require higher octane fuel to prevent knocking.
Q3: What's the difference between displacement and clearance volume?
A: Displacement volume is the volume swept by the piston, while clearance volume is the volume remaining when the piston is at top dead center.
Q4: Can this calculator be used for diesel engines?
A: Yes, the same formula applies, though diesel engines typically have higher compression ratios (14:1 to 25:1) than gasoline engines.
Q5: Why is compression ratio unitless?
A: Compression ratio is a ratio of volumes, so the units cancel out, making it a dimensionless quantity.