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Rear power valve blocked.... Jetting???
#858645
11/20/10 06:28 PM
11/20/10 06:28 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Just cracked into my 830 DP. This carb was purchased from a company on EBay as remanufactured. It is a List 4788. Stock specs are square jetted at 80's front and rear, 6.5 power valves front and rear. I found that it was assembled with the rear power valve blocked, but was jetted per stock spec. Should I rejet the secondarys up to about an 88? or should I just install a powervalve?
This is on a street / strip 451, I am most interested in what will go fastest.
Thanks guys-
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Rear power valve blocked.... Jetting???
[Re: ProStDodge]
#858647
11/20/10 07:13 PM
11/20/10 07:13 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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Puyallup, WA
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okay, I've installed 89's in the rear with no PV.
I was dissapointed with the performance I saw last year out of my combo. Could this have been a reason? Essentially, I was 8-10 jet sizes lean in the secondary's.
Last edited by GEnsrud; 11/20/10 07:14 PM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Rear power valve blocked.... Jetting???
[Re: StealthWedge67]
#858648
11/20/10 10:27 PM
11/20/10 10:27 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
okay, I've installed 89's in the rear with no PV.
I was dissapointed with the performance I saw last year out of my combo. Could this have been a reason? Essentially, I was 8-10 jet sizes lean in the secondary's.
You have to remember the P/V was adding fuel at wide open throttle also so the amount of fuel going into the secondaries might have been close. But you did what I do as I dont run a P/V in my secondaries either and my jetting is about 80's and 86's. I would try what you have now and go from there. Good luck , Ron
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Re: Rear power valve blocked.... Jetting???
[Re: 383man]
#858649
11/20/10 10:38 PM
11/20/10 10:38 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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OP
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Glad you chimed in, Ron. I consider your car the benchmark for my combo, so I was wondering what you run jetting wise. Sounds like we're real close, now.
Just took it for a drive. Butt Dyno says we took a big step in the right direction. (Man, I love the sound of this thing at 6k with the poor street tires screaming for mercy) Gonna be a while before I know if that's true or not (tracks are closed for the season), but I'm really glad I found this issue.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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What p/v do you have in the primary block? What is your vacuum reading at idle(in gear)??? 
