Often asked: What Causes Valve Spring Failure?

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 long do valve springs last?

How Long do Valve Springs Last. Valve springs can last a long time, but they do wear. On higher mileage engines with 100,000 miles or more, it is not uncommon for the valve springs to lose tension. Springs that have lost more than 10% of their tension should be replaced.

How often should valve springs be replaced?

Valve springs that seldom see the high side of 3500 RPM will last a LOT Lot longer than valve springs which are constantly being revved to much higher engine speeds. Racers often have to replace their valve springs at the end of every season, or in some cases after every major race.

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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.

What does a bad valve spring sound like?

Re: What does a broken valve spring sound like? At idle it will most likely sound fine. When you drive it “normally” it will sound like you have an exhaust leak (“tick”) and will sputter and hesitate. If you floor it it will backfire and sould horrible.

How much does it cost to replace a valve spring?

The cost of this replacement job will be between $900 and $1,800, depending on the make and model of your vehicle. The process of replacing valve seals involves disassembling the entire engine until you can reach the valve spring.

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.

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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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.

Can I reuse valve springs?

In some cases, stock springs can be reused, as long as they are in good shape. Valve springs do wear out. If you are rebuilding the engine, it is a good idea to replace the valve springs. When swapping a cam, the most important thing to avoid is valve spring coil bind.

How do you know if your valves are bad?

Ticking or Popping Noises. Ticking or popping noises are the most common types of noises you will hear when you’re having trouble with your valves. Many times, you will hear this ticking before you notice other problems. This noise gets louder and faster as the engine is accelerated.

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.

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.

Can you change valve springs without removing head?

Normally, to remove the valve springs without removing the cylinder head the sparkplug for the cylinder you are working on Is removed, an adaptor is threaded into the sparkplug hole and a continuous supply compressed air is introduced into the cylinder through the adaptor (some air will leak past the rings hence the

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