Powervalves
#197209
01/18/09 03:12 PM
01/18/09 03:12 PM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
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i dont have one in my Dominator carb but If I do run one what about jetting.... I read my holley book but its a book. rather hear what you guys have done...
90's squared pri shooter .035 sec shooter .035 idle feeds .035 bleeds .045 idle / .075 mid / .035 main
street car 3800lbs changes were 3.91 28" tire to 4.10's 30" tire 11" converter to 9" custom converter Eddy rpm's stage 3 to Indy CNC's 295's 8 3/4 to Dana 60 TM7 with 4500 adapter to Indy 440-3
SS springs to caltracs CE stuff to Ranchos / front calvert shocks
93 pump gas car
I listed this stuff so someone wouldnt ask
Last edited by wedgeOmatic; 01/18/09 03:17 PM.
Mopar Performance
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Re: Powervalves
[Re: Thumperdart]
#197211
01/18/09 03:21 PM
01/18/09 03:21 PM
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Joined: Feb 2007
Posts: 6,295 U.S.
moparniac
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also where do you guys hook up your vacuum guage to? got any pics also?
thx
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Re: Powervalves
[Re: moparniac]
#197212
01/18/09 03:37 PM
01/18/09 03:37 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
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A lot depend's on what your power valve channel restricter is in your metering block, mine were .082 and I ended up jetting way down in the front, because when the PV opens the jet size and PVCR are added together to give you the fuel that the motor see's, seem's like I jetted down about 13 size's in the front when I put the PV in,,,B1KEN had a chart that showed the fuel flow of the jet's and a formula that did the same for the PVCR,I have stuck to that info and it has worked good for me,,,,as far as a vac gauge I drilled and tapped a hole and added a fitting to the spacer under my carb.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Powervalves
[Re: moparniac]
#197213
01/18/09 03:55 PM
01/18/09 03:55 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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I have a port on my adapter/spacer that I hook a gauge up to although w/ big cams, a 2.5-3.5 gets the job done.
Last edited by Thumperdart; 01/18/09 03:55 PM.
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]
#197214
01/18/09 05:09 PM
01/18/09 05:09 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
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I Live Here
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Quote:
I have a port on my adapter/spacer that I hook a gauge up to although w/ big cams, a 2.5-3.5 gets the job done.
That's where I ended up with my PV,,,3.5
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Powervalves
[Re: Thumperdart]
#197217
01/18/09 05:28 PM
01/18/09 05:28 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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Quote:
I ended up w/90`s in the ft. w/a 3.5 pv and 99`s in the rear on my hp 1050 8082-3 dommy and it was chassis dynoed and has gone faster than ever this way. I usually jet down 8-10 sizes when using a pv.
how muc vac do you have at idle in gear?
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Re: Powervalves
[Re: The Avg. Valiant]
#197218
01/18/09 05:29 PM
01/18/09 05:29 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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Quote:
I just took my intake vacuum, divided by 2 and there was my PV number. This is what I was told to do by 2 old time guys, not sure if its true but its worked so far.
thats not the way you do it
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Re: Powervalves
[Re: Quicktree]
#197220
01/18/09 08:41 PM
01/18/09 08:41 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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Quicktree, I have about 5 1/2-6"`s at idle and bet 10-11 cruising.
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: Quicktree]
#197221
01/18/09 09:06 PM
01/18/09 09:06 PM
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Joined: Apr 2005
Posts: 1,091 Col. Ohio
The Avg. Valiant
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super stock
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Col. Ohio
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Quote:
Quote:
I just took my intake vacuum, divided by 2 and there was my PV number. This is what I was told to do by 2 old time guys, not sure if its true but its worked so far.
thats not the way you do it
Im all ears(im just running a 750 with vacuum secondaries, so I to am interested in how to set this as I dont have a DOM)
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Re: Powervalves
[Re: Thumperdart]
#197226
01/18/09 10:58 PM
01/18/09 10:58 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
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Quote:
Quicktree, I have about 5 1/2-6"`s at idle and bet 10-11 cruising.
then your PV should a 41/2 to 5
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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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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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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
Quicktree
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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.
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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
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Mopar Lane,Mississippi
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Why on earth would you want to run a powervalve in a dominator? 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 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....
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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: 43,215 Bend,OR USA
Cab_Burge
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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 I now use one to two inches less power valve rating than the motor has idleing in gear 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 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
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.
you are wasting your time trying to explain it.
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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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I Win
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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.
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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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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)
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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
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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
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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Posts: 6,295
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is there powervalve blowout protection for dominators...
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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.....
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