Readers ask: How Much Valve Spring Pressure?

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.

What is valve spring seat pressure?

Seat pressure is the pressure the valve spring places on the valve when it is in closed position. Open pressure is the spring pressure that forces the valve to close after the rocker arm pushes it open during the combustion cycle.

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.

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).

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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.

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.

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.

What is the purpose of valve spring?

The function of an internal combustion engine valve spring is to provide sufficient force throughout the engine cycle to maintain the tappet in contact with the cam at all speeds within the engine speed range.

When should a valve spring be replaced?

Valve springs should also be replaced if they are out-of-square. If the spring leans to one side more than about 1/32 inch when placed against a 90 degree square, the coils have deformed and the valve spring needs to be replaced.

How do you break in a new valve spring?

To properly break in your newly installed valve springs, run your newly installed valve springs through one heat cycle at a maximum of 1,500-2,000 rpm until the engine warms up and then let your engine cool down.

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What are the symptoms of a broken valve spring?

Broken or weak valve springs in an engine can cause many different drivability and performance problems. Broken valve springs cause excessive valve noise, compression loss and can cause severe internal engine damage.

How do I choose a valve spring?

Selecting a Spring Use only the valve springs that will give the correct spring pressure with the valve both on the seat and at maximum lift. The outside diameter of the recommended valve spring may require that the spring pocket of the head be machined to a bigger size.

How do you measure a free valve spring?

Check valve spring free length with a caliper. Check the valve springs installed height from the base or pocket in the head to the bottom of the retainer. If this height is excessive, add the appropriate shim to bring the spring back to its proper tension. Any short springs (~1/16 inch) should be replaced.

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