What Are Valve Spring Shims Used For?

What happens when valve spring tension is too low?

If spring tension is too light, valve float and eventual engine damage can occur. According to cam experts, one of the most common causes of premature camshaft failure is the use of improper valve springs. This can include too high or too low spring pressure, or the springs can just be plain worn out.

Can you stack valve spring shims?

Stacking shims won’t hurt a thing. As long as the spring is sitting on a flat hard surface and has some way of establishing a stable spring pocket to keep it in proper relationship to the valve stem.

Are valve spring locators necessary?

Using a Spring Seat Locator will allow the valve spring to maintain its designed location, without dancing around on the surface of the cylinder head and possibly damaging it. Zeke Urrutia from Ferrea explains just why a set of Spring Seat Locators is a good idea for a potent engine.

Can you have too much valve spring pressure?

Yes, too much spring pressure will damage parts. As you have seen first hand. Too much seat pressure will collapse lifters and cause valves to float as well.

Do heavier valve springs add horsepower?

We have done A-B-A engine dyno tests, and you do not lose HP with heavier springs. However, too light (seat pressure) can be VERY bad for the valve train, especially the roller lifters themselves.

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What causes valve spring failure?

What Can Cause Valve Springs To Fail. To maintain correct valve operation at normal engine speeds; all of the valve springs must exert a certain amount of spring pressure. Consequently, too low or week valve spring pressure; may cause valves to not completely seal or float under higher (RPM).

What happens when valve spring tension is too high?

If the spring pressures are too high, the added friction will result in: More heat, Faster valvetrain wear, Potential failure of other valvetrain parts (i.e. rocker arms, pushrods, etc.), and.

Are stiffer valve springs better?

Higher spring rates mean greater force on the camshaft and consequently more resistance to rotation. The flip side to this argument is that stiffer valve springs control the valves better at high speed and provide better prevention of bouncing valves, which can create more power.

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