1. What is Compression Height?

Compression height is the distance from the center of the piston's wrist pin to the top of the piston crown. It's a critical measurement in engine building that affects compression ratio and piston-to-valve clearance.

2. How Does the Calculator Work?

The calculator uses the compression height formula:

Where:

• \( \text{Deck Height} \) — Distance from crank centerline to block deck (in)
• \( \text{Rod Length} \) — Center-to-center length of connecting rod (in)
• \( \text{Stroke} \) — Engine stroke length (in)
• \( \text{Piston to Deck} \) — Distance piston sits above/below deck at TDC (in)

Explanation: The formula calculates how much piston material exists above the wrist pin to achieve proper deck clearance.

3. Importance of Compression Height

Details: Proper compression height ensures correct piston placement in the cylinder for optimal compression ratio, valve clearance, and combustion chamber volume.

4. Using the Calculator

Tips: Enter all measurements in inches. Deck height and rod length are fixed engine dimensions. Piston to deck is positive if piston is below deck, negative if above.

5. Frequently Asked Questions (FAQ)

Q1: Why is compression height important?
A: It determines where the piston sits at top dead center (TDC), affecting compression ratio, quench, and valve clearance.

Q2: What's a typical compression height range?
A: Varies by engine, but common ranges are 1.000"-1.500" for small block engines, 1.600"-2.000" for big blocks.

Q3: How does stroke affect compression height?
A: Longer strokes generally require shorter compression heights to maintain proper deck clearance.

Q4: Can I use this for custom pistons?
A: Yes, this calculation helps determine required dimensions when ordering custom pistons.

Q5: What if my piston to deck is zero?
A: Zero means piston is exactly flush with deck at TDC - ideal for many performance applications.