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should i block power valve #1467407 07/13/13 06:50 PM 07/13/13 06:50 PM
Joined: Jan 2013 Posts: 25 pa O oldschoolracer OP member
oldschoolracer OP member O Joined: Jan 2013 Posts: 25 pa	should i block power valve in primary race only car. secondary is already blocked. it's a 1050 quick fuel ser 4150.

Re: should i block power valve [Re: oldschoolracer] #1467408 07/13/13 06:51 PM 07/13/13 06:51 PM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	i do

Re: should i block power valve [Re: oldschoolracer] #1467409 07/13/13 07:15 PM 07/13/13 07:15 PM
Joined: Mar 2006 Posts: 529 Rowlett, TX 7 74DusterP457 mopar addict
74DusterP457 mopar addict 7 Joined: Mar 2006 Posts: 529 Rowlett, TX	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.

Re: should i block power valve [Re: 74DusterP457] #1467410 07/13/13 07:55 PM 07/13/13 07:55 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	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. Fastest 300

Re: should i block power valve [Re: oldschoolracer] #1467411 07/13/13 08:06 PM 07/13/13 08:06 PM
Joined: Jan 2003 Posts: 25,881 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,881 Rio Linda, CA	If you're not pulling a vacuum at WOT there's no reason to block the PV. The INTERNET, the MISinformation superhighway

Re: should i block power valve [Re: Crizila] #1467412 07/14/13 12:20 AM 07/14/13 12:20 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	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)

Re: should i block power valve [Re: John_Kunkel] #1467413 07/14/13 12:21 AM 07/14/13 12:21 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Quote: If you're not pulling a vacuum at WOT there's no reason to block the PV. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: should i block power valve [Re: Cab_Burge] #1467414 07/14/13 01:43 AM 07/14/13 01:43 AM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Keep it, It will make your engine happier and crisper keeping the plugs cleaner. BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: should i block power valve [Re: bigtimeauto] #1467415 07/14/13 10:43 AM 07/14/13 10:43 AM
Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama M MRMOPAR622 top fuel
MRMOPAR622 top fuel M Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama	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"

Re: should i block power valve [Re: MRMOPAR622] #1467416 07/14/13 10:48 AM 07/14/13 10:48 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	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

Re: should i block power valve [Re: MR_P_BODY] #1467417 07/14/13 11:22 AM 07/14/13 11:22 AM
Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama M MRMOPAR622 top fuel
MRMOPAR622 top fuel M Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama	Quote: 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 They may have a valve now to keep the back fire from blowing out the valve,but I bet they still have a mind of their own and can open an close at will. All joking aside I have never been able to get them to work right and work right all the time on any engine,but some times on a street engine you just have to settle for as best/close as you can get things. PS thats why I am becoming a bigger & bigger fan of FI! "To Be The Man'You Have Got To Beat The Man" "T/D and Pro-Bracket Racer"

Re: should i block power valve [Re: MRMOPAR622] #1467418 07/14/13 11:23 AM 07/14/13 11:23 AM
Joined: Jan 2003 Posts: 32,394 Q Quicktree I Win
Quicktree I Win Q Joined: Jan 2003 Posts: 32,394	PV's fail all the time. just another thing to worry about on a race car. they are not needed.

Re: should i block power valve [Re: MRMOPAR622] #1467419 07/14/13 11:43 AM 07/14/13 11:43 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	PS thats why I am becoming a bigger & bigger fan of FI! Same here.. I was on the FI from the start at Chrysler but that system isnt designed for change.. if I could buy a nice aftermarket system at a REASONABLE price I would but not at close to $3000 .. I can buy ALOT of fuel for that

Re: should i block power valve [Re: MR_P_BODY] #1467420 07/14/13 03:07 PM 07/14/13 03:07 PM
Joined: Jan 2007 Posts: 3,695 nc E emarine01 master
emarine01 master E Joined: Jan 2007 Posts: 3,695 nc	No PVs here, race only, I can live without one @ low rpm, I don't cruise @ all, its WOT or idle except for a quick blip going up the ramps while loading, PVs are just one more thing to mess up, its easy to just square jet.

Re: should i block power valve [Re: emarine01] #1467421 07/14/13 04:07 PM 07/14/13 04:07 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	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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