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Author Topic:   power valve

Posts: 85
From: Metamora, Illinois
Registered: Dec 2000

posted 03-10-2001 02:14 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
I always have run a power valve in my 800 DP mostly to keep the plugs cleaner running around the pits.When I got my new moter together with a healthy roller cam it didn't have enough vacuum to hold the valve shut so I switched to a 2.5 valve, figuring since it is a race only moter at wide open throttle the valve would be open and closed at idle.I told this to a friend, and he said to be carefull running the low vacuum power valves because at the big end of the track the vacuum could come back up and close the valve causing the motor to lean! Never have ran a vacuum gauge in the car going down the track,(may have to) what do you guys think? Roger

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Gary Ferringer

Posts: 59
From: Kennerdell,Pa.
Registered: Feb 2001

posted 03-10-2001 02:27 PM     Click Here to See the Profile for Gary Ferringer   Click Here to Email Gary Ferringer     Edit/Delete Message   Reply w/Quote
You definitely want to be careful. If you are starting to run out of air flow in your carb it could happen. What is your idle vacuum? I have about 9 inches of hg,and I am running a 5.0 P.V. in mine. It seems to work ok. This is something to be very careful of,so monitor it closely.

'85 Capri
Cleveland powered

'72 Pinto
CARBURETTED,draw thru turbo 4 cylinder. Runs good.

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Posts: 11493
From: Lyons, IL, USA
Registered: May 99

posted 03-10-2001 06:54 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I don't like to use anything less than a 3.5 or 4.5 PV normally. 2.5's are generally used in extreme conditions where ultra high overlap cams are used or in certain circle trac carb applications.

Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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