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What makes powervalves go up?

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Old 09-30-2007
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Zrxpilot
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Default What makes powervalves go up?

Been wondering this for some time. What is the mechanical reaction that makes the ves valves lift in a Polaris? Presumably its the pressure of the exhaust stroke? The actual spring tension being the denominator of when? If thats the case you would think the springs would need replacing from time to time. Just asking.
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Old 09-30-2007
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Default Re: What makes powervalves go up?

Depending on the MFR they're either electric (cable/solenoid) or gas pressure. The gas pressure are more reliable and prevelant nowadays.

As the pressure builds up in the exhaust port it travels up a smally hole in the jug. There it creates positive pressure in a small area sealed by a piece of rubber, neoprene and/or o-rings called a "bellows". It overcomes the force of the spring and pushes the valve up. They don't go up/down with each stroke, instead they smoothly open/close and stay open as long as you're above the threshhold.

Common misconception is higher HP from powervalves, which is untrue. They just make more usable HP down low.
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