BoreToStrokeRatioCalculator

How to Use the Calculator

1. Enter the bore (cylinder diameter) in centimeters in the first input field.
2. Enter the stroke (piston travel) in centimeters in the second input field.
3. Click the "Calculate" button to compute the bore-to-stroke ratio.
4. The result will be displayed in the results section.

Understanding Bore-to-Stroke Ratio

The bore-to-stroke ratio is a dimensionless number that compares the cylinder's diameter to its stroke length. It's calculated by dividing the bore by the stroke.

A higher bore-to-stroke ratio (bigger bore relative to stroke) typically produces more power, especially at higher RPMs, but may reduce low-end torque and fuel efficiency. This is commonly used in performance engines.

A lower bore-to-stroke ratio (smaller bore relative to stroke) generally provides better low-end torque and fuel efficiency but may produce less peak power. This is often found in economy or efficiency engines.

Example Calculation

For an engine with a bore of 85 mm (8.5 cm) and a stroke of 95 mm (9.5 cm):

Bore-to-Stroke Ratio = 8.5 cm / 9.5 cm = 0.89

Applications

• Engine performance analysis
• Engine design and modification planning
• Comparing different engine configurations
• Understanding power curves and engine characteristics