1. What is Valve Spring Lift?

Valve spring lift is the maximum distance a valve spring can compress before it reaches coil bind. It's a critical measurement for ensuring proper valve train operation in truck engines.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( L \) — Valve spring lift (mm)
• \( IH \) — Installed height of the spring (mm)
• \( \text{Bind Height} \) — Height at which spring coils touch (mm)

Explanation: The lift is simply the difference between the spring's installed height and its bind height.

3. Importance of Proper Valve Spring Lift

Details: Correct valve spring lift ensures proper valve operation, prevents coil bind, and maintains correct spring pressure throughout the lift curve.

4. Using the Calculator

Tips: Measure installed height and bind height carefully in millimeters. Both values must be positive numbers with installed height greater than bind height.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical valve spring lift for truck engines?
A: Most truck engines have valve lifts between 10-15mm, but always check manufacturer specifications.

Q2: Why is coil bind dangerous?
A: Coil bind can cause valve train damage, broken springs, or bent pushrods/valves.

Q3: How much safety margin should I have?
A: Typically 1-2mm of clearance beyond maximum lift is recommended.

Q4: Does temperature affect these measurements?
A: Measurements should be taken at room temperature as heat can affect spring properties.

Q5: When should I check valve spring lift?
A: Whenever changing camshafts, valves, or springs, or if experiencing valve train issues.