Readers ask: Are Valve Spring Bad?

How do I know if I have a bad valve spring?

Symptoms of Weak Valve Springs The engine may start and idle fine, or run normally up to 3500 to 4000 RPM. But at higher speeds, it may misfire and lose power because the valves are floating because the springs are weak and unable to keep up with the speed of the valvetrain.

Do valve springs go bad from sitting?

Something that will hurt them ( valve springs ) just sitting is corrosion. Condensation or mis-handling (without gloves) can leave salt from your pores on the surface and start corrosion. I use Manley 424s and leave them sit for years. No problem.

What happens if a valve spring breaks?

Broken valve springs cause excessive valve noise, compression loss and can cause severe internal engine damage. Actions following the breaking cause the most serious damage to the engine. When spring breaks, it may collapse just enough to allow the valve to drop into the cylinder, where the piston may strike it.

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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.

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 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.

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 I know what valve springs to buy?

Most manufacturers will recommend valve springs to go with each camshaft they make. We recommend the same springs listed by the camshaft manufacturer, or a spring with similar specifications. Understanding the spring specifications will help you select the right springs for your engine.

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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.

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.

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.

Can you replace valve seals without removing the head?

The worn seals cause oil to leak between the valve stem and guide, causing blue-gray smoke to come out of the tail pipe every time you start the engine. On most vehicles, it’s possible to replace these valve seals without removing the head.

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.

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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When should you upgrade valve springs?

The only reason to upgrade your valve springs is age or a significant increase in RPM usage. An intake valve is aprox 2 sq in – so increase of intake manifold pressure of 5psi will add 10 psi of pressure against the valve spring.

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