Is there a way to know if the power valve is opening to soon? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-05-2010, 11:30 AM
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Is there a way to know if the power valve is opening to soon?

I was wondering if there is any other way you can tell if the power valve is opening to soon rather than looking at the vacuum? What happens if you go with to small a power valve

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Old 05-05-2010, 04:00 PM
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hello, the power valve with no vacuum applied is open, it is the engines vacuum which holds it closed, the rating is the amount of vacuum required to keep it closed, once engine vacuum drop below that level the spring overpowers the vacuum on the opposing side and it opens, too low of a rating and it will want to lean out do to needing the fuel sooner than it gets it, the farther the throttle plates are open the more vacuum the engine loses, if it runs lean and pops you made need one which opens sooner, as far as checking without reading vacuum, the only method i know of is drive it, change, drive again, was it better or worse? can be time consuming to get one tuned just right, but its worth it when the smell of burnt rubbers in the air
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