Re: Powervalves
[Re: AndyF]
#197230
01/19/09 07:30 AM
01/19/09 07:30 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
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Quote:
Intake vacuum divided by 2 should work fine. If the idle vacuum is higher than 12 inches then use a 6.5.
it may work if you compensate for the fuel loss at tip in some other way. 2 less than the vac at idle in gear is the way to set PV'S.
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Re: Powervalves
[Re: moparniac]
#197231
01/19/09 02:50 PM
01/19/09 02:50 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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At wot the vaccum goes to zero or close to zero. As far as 20"s at idle, camshaft duration, overlap etc. play a big role in the amount of vaccum a motor produces so the bigger the cam, the less vacuum. This is a basic version and I`m sure someone can better explain it.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Powervalves
[Re: Thumperdart]
#197232
01/19/09 03:30 PM
01/19/09 03:30 PM
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Joined: Nov 2003
Posts: 10,384 Upstate NY
Bigcube
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I run a 6.5 PV in the front. The PV will NOT see vacuum at idle if the carb is on the idle circuit therefor dividing idle vacuum makes no sense. In my 1150 dominator I ran 93 sq jetting with the PV's blocked and don't recall exactly where I ended up with the PV in the front but I think it was around 98 in the back and 85 the front with the PV.
Jim
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Re: Powervalves
[Re: Bigcube]
#197233
01/19/09 03:32 PM
01/19/09 03:32 PM
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Joined: Jan 2003
Posts: 32,394
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Quote:
I run a 6.5 PV in the front. The PV will NOT see vacuum at idle if the carb is on the idle circuit therefor dividing idle vacuum makes no sense. In my 1150 dominator I ran 93 sq jetting with the PV's blocked and don't recall exactly where I ended up with the PV in the front but I think it was around 98 in the back and 85 the front with the PV.
![](/ubbthreads/images/graemlins/iagree.gif)
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Re: Powervalves
[Re: Quicktree]
#197234
01/25/09 03:59 PM
01/25/09 03:59 PM
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Joined: May 2008
Posts: 902 Mopar Lane,Mississippi
67HEMI
super stock
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super stock
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Mopar Lane,Mississippi
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Why on earth would you want to run a powervalve in a dominator? ![](/ubbthreads/images/graemlins/rolleyes.gif) Mine has zero issues with idle and has a 268/276@ .050 roller.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: Powervalves
[Re: AndyF]
#197236
01/25/09 04:48 PM
01/25/09 04:48 PM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
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I had a customer BIGS dominator made and it dont have a powervalve.... 90 squared...... seems like most recommend one ![](/ubbthreads/images/graemlins/1343795-scratchchin.gif) Now when i had the carb made I had a 11" converter then and a custom 9" now... and MCH MW indy eZ's coming next week as opposed to the full port eddy rpm's.. 3800lb e body street car....
Mopar Performance
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Re: Powervalves
[Re: 602heavy]
#197238
01/25/09 07:44 PM
01/25/09 07:44 PM
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Joined: Aug 2003
Posts: 43,332 Bend,OR USA
Cab_Burge
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Bend,OR USA
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I have heard on hear about the power valves not opening while idling in gear but I have cured loading up on cars that had 6.5 power valeves in the carbs and idle at 5 to 5.5 inche of vacume in gear ![](/ubbthreads/images/graemlins/shruggy.gif) I now use one to two inches less power valve rating than the motor has idleing in gear ![](/ubbthreads/images/graemlins/thumbs.gif) works good, last a long time. I like using power valves in all Holley type carbs to keep the idle and part throttle cruise circuits lean enough to help keep the plugs clean ![](/ubbthreads/images/graemlins/scope.gif) The last post also brought out a good point about the power valves doing exactly what there designed to do, help add fuel at wide open throttle as needed ![](/ubbthreads/images/graemlins/thumbs.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Powervalves
[Re: 602heavy]
#197240
01/25/09 08:18 PM
01/25/09 08:18 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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Quote:
If the throttle blades are correctly set @ idle the boosters should'nt see any signal even though the vac @ idle could well be below PV rating.
As said , the PV is a fuel enrichment device , if the power valve is flowing fuel @ idle it would indicate a loose or ruptured PV diaphram. ![](/ubbthreads/images/graemlins/eeek.gif)
you are wasting your time trying to explain it. ![](/ubbthreads/images/graemlins/laugh2.gif)
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Re: Powervalves
[Re: 602heavy]
#197242
01/25/09 08:24 PM
01/25/09 08:24 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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Quote:
Okey Dokey , not exactly rocket science.
yup with you we just have a bunch of hard headed old geezers on here. ![](/ubbthreads/images/graemlins/laugh2.gif)
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Re: Powervalves
[Re: Quicktree]
#197243
01/25/09 08:25 PM
01/25/09 08:25 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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Lets see here, with a power valve that breaks, I dont get the enrichment.... no thanks I dont need anything else that can break.... I'll jet it up and be happy(plus my dom idles fine and it doesnt load up) ![](/ubbthreads/images/graemlins/wave.gif)
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Re: Powervalves
[Re: Blown61]
#197246
01/25/09 08:40 PM
01/25/09 08:40 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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I hope you didnt post that link for my behalf, I dont run one due to if it breaks I loose a engine, when I can get away without it and jet up a few jets..... but thanks for the link anyways but I have it in my favorites already ![](/ubbthreads/images/graemlins/wave.gif)
Last edited by MR_P_BODY; 01/25/09 08:42 PM.
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Re: Powervalves
[Re: 602heavy]
#197247
01/25/09 08:43 PM
01/25/09 08:43 PM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
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Joined: Feb 2007
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is there powervalve blowout protection for dominators...
Mopar Performance
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Re: Powervalves
[Re: moparniac]
#197248
01/25/09 08:44 PM
01/25/09 08:44 PM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
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just read the holley link.. it says a powervalve cant go bad on engine backfire.... impossible it says.....
Mopar Performance
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