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What do dual valve springs do?

What do dual valve springs do?

Dual Springs are a good option for performance engines with a heavy valvetrain. The two springs rub against each other and act as a damper. The second spring also acts as a safety measure. Broken springs can be found before they drop a valve into the engine.

What is the reason to have two springs fitted to one valve?

If the frequency of the natural vibration of air or exhaust valve springs is a harmonic of the camshaft speed, then the spring may vibrate axially and are said to surge. Surge can be avoided by modifying the sizes of springs by arranging the springs in pairs and fitting one inside the other.

Do dual valve springs add horsepower?

While these heavy dual springs do the job, there is a high-tech alternative. engine with a bigger cam and a better spring than the stock 454 H.O. and still managed to improve the peak power by 20 horsepower and increase the peak engine speed from 5,200 to 5,600 rpm. This really came as no surprise.

Why do some engine manufacturers use two valve springs on a valve?

Adding more valves increases valve area and improves the flow of intake and exhaust gases, thereby enhancing combustion, volumetric efficiency, and power output.

Are stiffer valve springs better?

Stiffer springs are obviously needed if you are building a high rpm performance engine. But the stiffest springs are not necessarily the best anymore. If you can achieve essentially the same degree of valve control with a lower spring rate, the springs will last longer and be less apt to break.

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. The life of these springs is also dependent on how your vehicle is driven.

What are symptoms of a broken valve spring?

Broken valve springs cause excessive valve noise, compression loss and can cause severe internal engine damage. The actual breaking of the valve springs is not always the most serious consequence. Actions following the breaking cause the most serious damage to the engine.

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).

How often should you change valve springs?

Spring pressures should be checked once a year or every 15K miles. Proper maintenance does not mean they will need replacing. Some springs can last more than 30k if properly installed.

Can valve springs be too stiff?

valve float and engine damage can occur if spring tension is too light. If the spring is too stiff, it will result in loss of power. The springs can be plain worn out if they are too high or too low. …

Which is better 2 valve or 4 valve?

4 valves per cylinder allows for more airflow than 2 valves per cylinder, as there is larger open area when the valves are open. Having a configuration with DOHC and four valves per cylinder means better airflow, especially at high engine speeds, resulting in better top end power.

How do I know what valve springs I need?

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.