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Re: Powervalves [Re: Blown61] #197229
01/19/09 06:29 AM 01/19/09 06:29 AM
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moparniac Offline OP
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Quote:

Why not put a vac gauge on it and map where it is during cruise and wot then you can put in a pv with a lit lower rate to stay shut until you need it?



makes sense to me but i am a racer in training.... soooooooooo

Mopar Performance
Re: Powervalves [Re: AndyF] #197230
01/19/09 07:30 AM 01/19/09 07:30 AM
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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.
Re: Powervalves [Re: moparniac] #197231
01/19/09 02:50 PM 01/19/09 02:50 PM
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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.

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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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Upstate NY
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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
Re: Powervalves [Re: Bigcube] #197233
01/19/09 03:32 PM 01/19/09 03:32 PM
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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.




Re: Powervalves [Re: Quicktree] #197234
01/25/09 03:59 PM 01/25/09 03:59 PM
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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.

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Re: Powervalves [Re: 67HEMI] #197235
01/25/09 04:17 PM 01/25/09 04:17 PM
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Oregon
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I'd almost always recommend a powervalve on the primary side of a Dominator, even for a drag race car. I don't see any reason to get rid of a fuel circuit when it is there for the taking.
Re: Powervalves [Re: AndyF] #197236
01/25/09 04:48 PM 01/25/09 04:48 PM
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moparniac Offline OP
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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....

Mopar Performance
Re: Powervalves [Re: moparniac] #197237
01/25/09 05:12 PM 01/25/09 05:12 PM
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UK
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602heavy Offline
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Always run a PV in the primaries especialy on a street/strip motor , powervalves are also common in the secondaries , there's a limit on jet size.
Re: Powervalves [Re: 602heavy] #197238
01/25/09 07:44 PM 01/25/09 07:44 PM
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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 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)
Re: Powervalves [Re: Cab_Burge] #197239
01/25/09 08:12 PM 01/25/09 08:12 PM
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UK
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602heavy Offline
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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.


Last edited by 602heavy; 01/25/09 08:16 PM.
Re: Powervalves [Re: 602heavy] #197240
01/25/09 08:18 PM 01/25/09 08:18 PM
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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.

Re: Powervalves [Re: Quicktree] #197241
01/25/09 08:22 PM 01/25/09 08:22 PM
Joined: Dec 2008
Posts: 1,200
UK
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602heavy Offline
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Okey Dokey , not exactly rocket science.
Re: Powervalves [Re: 602heavy] #197242
01/25/09 08:24 PM 01/25/09 08:24 PM
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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.

Re: Powervalves [Re: Quicktree] #197243
01/25/09 08:25 PM 01/25/09 08:25 PM
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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)
Re: Powervalves [Re: MR_P_BODY] #197244
01/25/09 08:28 PM 01/25/09 08:28 PM
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Re: Powervalves [Re: MR_P_BODY] #197245
01/25/09 08:30 PM 01/25/09 08:30 PM
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UK
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602heavy Offline
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I use a PV cos the motor is street driven , if it were purely for the strip i would remove it , can't say i would'nt use a PV in the secs though , got a bigger motor for this year so a PV in the secs might be on the cards.
Re: Powervalves [Re: Blown61] #197246
01/25/09 08:40 PM 01/25/09 08:40 PM
Joined: Jun 2003
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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

Last edited by MR_P_BODY; 01/25/09 08:42 PM.
Re: Powervalves [Re: 602heavy] #197247
01/25/09 08:43 PM 01/25/09 08:43 PM
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moparniac Offline OP
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is there powervalve blowout protection for dominators...

Mopar Performance
Re: Powervalves [Re: moparniac] #197248
01/25/09 08:44 PM 01/25/09 08:44 PM
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moparniac Offline OP
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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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