1. What is Valve Spring Installed Height?

Installed Height (IH) is the measurement of a valve spring when it is installed in the cylinder head with the retainer and valve stem in place. It's a critical dimension for proper valve spring operation and tension.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( IH \) — Installed Height (mm)
• \( \text{Retainer Height} \) — Height of the spring retainer (mm)
• \( \text{Valve Stem} \) — Length of the valve stem (mm)

Explanation: The installed height determines the spring's preload and affects valve train operation.

3. Importance of Installed Height

Details: Correct installed height ensures proper spring tension, valve seating, and prevents valve float at high RPMs. Incorrect height can lead to poor engine performance or valve train damage.

4. Using the Calculator

Tips: Measure retainer height and valve stem precisely in millimeters. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is installed height important?
A: It determines spring pressure which affects valve operation and engine performance.

Q2: What's a typical installed height range?
A: Typically between 1.400-1.800 inches (35.56-45.72 mm), but varies by application.

Q3: How do I measure retainer height?
A: Measure from spring seat to bottom of retainer with valve closed.

Q4: What if my installed height is wrong?
A: Use shims to adjust height or select different springs/retainers.

Q5: Does this work for all valve springs?
A: Yes, but always verify with manufacturer specifications.