Re: holley carb set-up for footbrake
[Re: Dan Brewer]
#821844
10/04/10 08:53 PM
10/04/10 08:53 PM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
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master
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Posts: 5,080
organ
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if the air is good you may need to try 50cc pumps front and rear. holley used to recommend this on all double pumper drag race apps, and many times it is required.
for what is the good life if not doing things thoughtfully?
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Re: holley carb set-up for footbrake
[Re: Locomotion]
#821847
10/04/10 09:23 PM
10/04/10 09:23 PM
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Joined: Apr 2006
Posts: 3,675 Akron, Ohio U.S.A.
roadhazard
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Akron, Ohio U.S.A.
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Dan I have 28 squirters in my Dominator Been up in the 40's to get away from a bog myself but didn't help What's your initial timing at? Edit; you have 9-10" with a .620 cam what cam is that
Last edited by roadhazard; 10/04/10 09:26 PM.
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Re: holley carb set-up for footbrake
[Re: roadhazard]
#821849
10/04/10 09:52 PM
10/04/10 09:52 PM
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Joined: Jul 2008
Posts: 1,534 bronx n.y
one bad fish
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pro stock
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bronx n.y
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Quote:
Dan
I have 28 squirters in my Dominator Been up in the 40's to get away from a bog myself but didn't help
What's your initial timing at ? 40 degrees bu i have a small block Edit; you have 9-10" with a .620 cam what cam is that
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Re: holley carb set-up for footbrake
[Re: Dan Brewer]
#821851
10/04/10 10:22 PM
10/04/10 10:22 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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""Has a bog when you launch at 2000.""
Try moving your primary pump cam to position #2. This will delay the shot. You are wasting some of the pump shot from the cam while bringing up the rpms to 2000. Delay the cam to see if the bog gets better. Some pump cams have three holes for this purpose. My Demon had three holes on the pink cams to delay the shot.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: holley carb set-up for footbrake
[Re: Quicktree]
#821853
10/04/10 10:32 PM
10/04/10 10:32 PM
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Joined: Jan 2003
Posts: 5,895 Florida
Locomotion
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Quote:
one thing I see is the power valve is to small with that vac. it should be around 7-8 instead of 4.5. what pump cam do you have?
"Late", not "small". Flow is the same regardless of #.
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Re: holley carb set-up for footbrake
[Re: Locomotion]
#821854
10/04/10 10:36 PM
10/04/10 10:36 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
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Quote:
Quote:
one thing I see is the power valve is to small with that vac. it should be around 7-8 instead of 4.5. what pump cam do you have?
"Late", not "small". Flow is the same regardless of #.
thats what I was talking about. being late could cause the stumble
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Re: holley carb set-up for footbrake
[Re: Dan Brewer]
#821858
10/04/10 11:41 PM
10/04/10 11:41 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
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Quote:
Annular boosters, the pump cams are white. I have a pr of 37 squirters so I can try them. I always thought that you divide the idle vac by 2 and that is a good starting point for the pv's I haven't been to the track yet but I do have 80' of new concrete that is getting broke in proper. Thanks for all the input, I have some things to try now.
you may get away with the dividing thing on a stock street car but it doesn't work well with performance combo's. also try a more aggressive cam like a brown or blue if the bigger squirters don't work. I myself like the 50cc pumps. you can use a smaller squirter.
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Re: holley carb set-up for footbrake
[Re: Quicktree]
#821859
10/05/10 11:13 PM
10/05/10 11:13 PM
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Joined: Mar 2008
Posts: 768 Ohio
Dan Brewer
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-Update- So I switched the squiters from 28 to 37's. I had them so I gave them a try. Seems to have fixed the problem. Flashing the conv in high or launching the car feels great. I have some other pv's and cams on the way so I can tinker with them. Going to the track thurs for the real results. Anyone want to take a guess if the single 4 will be quicker/slower than the mw crossram and carters in similar air? Thanks again for the help/suggestions.
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