1. What is Valve Spring Installed Height?

The valve spring installed height (IH) is the measured length of the spring when it's installed in the engine under normal conditions. It's calculated by subtracting the spring rate adjustment from the solid height (SH) of the spring.

2. How Does the Calculator Work?

The calculator uses the valve spring installed height formula:

Where:

• \( IH \) — Installed height (mm)
• \( SH \) — Solid height (mm)
• \( \text{Spring Rate Adjustment} \) — Adjustment value (mm)

Explanation: The installed height determines the spring's preload and affects valve operation. Proper installed height ensures correct spring pressure throughout the valve's movement.

3. Importance of Correct Installed Height

Details: Correct installed height is crucial for proper valve spring operation. Too much height can cause valve float, while too little can cause excessive spring pressure and premature wear.

4. Using the Calculator

Tips: Enter solid height in mm and spring rate adjustment in mm. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is solid height (SH)?
A: Solid height is the length of the spring when fully compressed with all coils touching.

Q2: How do I measure spring rate adjustment?
A: Spring rate adjustment is typically provided by the manufacturer or can be calculated based on spring specifications.

Q3: What are typical installed height values?
A: Values vary by application but typically range between 1.2-1.8 times the spring's solid height.

Q4: What happens if installed height is incorrect?
A: Incorrect height can lead to valve train problems including poor performance, valve float, or accelerated wear.

Q5: Should I measure installed height with or without shims?
A: Always measure with any shims or other components that affect the spring's installed position.