| oldford2 | -- 04-24-2012 @ 7:06 AM |
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Well, I thought I understood the function of a power valve: vacuum holds it closed and when the throttle is quickly opened and the vacuum drops, the PV opens to add gas. O K so what am I forgetting? When you shut the engine down and there is no vacuum, why doesn't the valve open and drain all the gas. A senior moment I quess. I know when it is explained I will say: Dah, I knew that. John
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| TomO | -- 04-24-2012 @ 7:48 AM |
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The passage for the gas from the power valve goes up past the main jets to the idle tubes. The top of the idle tubes is above the fuel level in the carburetor bowl. If the power valve gasket seals the body of the power valve, the only path for the gas is up and liquids do not ordinarily flow up hill. Tom
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| supereal | -- 04-24-2012 @ 3:10 PM |
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I think Tom pretty well covered it. The power (economizer) valve is a spring loaded diaphragm actuated valve that allows extra fuel to be added under a hard pull that reduces manifold vacuum. These valves are calibrated to match the application so they just don't open when the engine is shut down. The main jets are fixed, so enrichment is necessary when the engine is loaded down. Otherwise, power wouldn't be available as needed.
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