Re: should i block power valve
[Re: oldschoolracer]
#1467408
07/13/13 06:51 PM
07/13/13 06:51 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
Joined: Jan 2003
Posts: 32,394
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Re: should i block power valve
[Re: oldschoolracer]
#1467411
07/13/13 08:06 PM
07/13/13 08:06 PM
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Joined: Jan 2003
Posts: 26,005 Rio Linda, CA
John_Kunkel
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Too Many Posts
Joined: Jan 2003
Posts: 26,005
Rio Linda, CA
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If you're not pulling a vacuum at WOT there's no reason to block the PV.
The INTERNET, the MISinformation superhighway
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Re: should i block power valve
[Re: Crizila]
#1467412
07/14/13 12:20 AM
07/14/13 12:20 AM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Quote:
Quote:
On a race only engine, a power valve isn't necessary if the carb is set up properly. I've seen guys use them, but more as a crutch when they have another problem.
If you do decide to block it off, you'll need to increase the primary jets. A good starting point is go Square.
Give Quickfuel a call. They can get you pointed the right direction and save you some trouble/time and money.
Paul.
I use one ( on the primary side only ) in a race only application. IMO, it keeps the plugs cleaner idling around the pits, on the return road, and in the staging lanes.
Me to, I use the power valve restriction channel size for getting the tune correct at wide open throttle, I jet the primary jet down one or two sizes to keep the part throttle driving lean on the primarys and use the PVRC to make up for the differences in sizes at WOT
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: should i block power valve
[Re: bigtimeauto]
#1467415
07/14/13 10:43 AM
07/14/13 10:43 AM
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Joined: Sep 2003
Posts: 2,008 Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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I don't like power valves on a Race engine.A race engine with high CR & big cams & lots of timing is going to spit back through the carb at times cranking and thats the end of the PV!An its seems like some times they have a mind of their own and can open & close as they please. Power Valves=Trouble!!!!!
Last edited by MRMOPAR622; 07/14/13 10:46 AM.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: should i block power valve
[Re: MRMOPAR622]
#1467416
07/14/13 10:48 AM
07/14/13 10:48 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I don't like power valves on a Race engine.A race engine with high CR & big cams & lots of timing is going to spit back through the carb at times cranking and thats the end of the PV!An its seems like some times they have a mind of their own and can open & close as they please. Power Valves=Trouble!!!!!
I dont run a PV but the carbs now days have a back fire valve to prevent the back fire to blow out the PV
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Re: should i block power valve
[Re: emarine01]
#1467421
07/14/13 04:07 PM
07/14/13 04:07 PM
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Joined: Jun 2007
Posts: 2,646 Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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There is more to drag racing than full throttle. Use a power valve, learn how a carb works and you will be more consistent and be able to foot brake or trans break cleanly. I even use one in my Dart blow thru.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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