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Re: Question on 6 Pack Vaccuum requirement
[Re: Twostick]
#1484982
08/15/13 02:29 PM
08/15/13 02:29 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Manifold vacuum has nothing to do with opening the outboard carbs.
Kevin
x2, it's air velocity thru the passenger side center carb venturi. look for a fuel delivery problem.
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Re: Question on 6 Pack Vaccuum requirement
[Re: superwrench]
#1484985
08/16/13 01:58 AM
08/16/13 01:58 AM
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Joined: Jun 2009
Posts: 233
vashon island washington
hunterstroble
enthusiast
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enthusiast
Joined: Jun 2009
Posts: 233
vashon island washington
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I had a new engine I wass dissapointed with until one day I noticed my throttle cable was only opening up the throttle 75%. Dumb question, is your throttle getting max pull?
1969 Dodge dart 500 stroker
1973 Dodge Challenger 440
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Re: Question on 6 Pack Vaccuum requirement
[Re: superwrench]
#1484987
08/16/13 10:22 AM
08/16/13 10:22 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Quote:
Make sure those end carbs cycle freely... and another thing that might sound stupid......make sure the base gasket is on the right way otherwise the end carbs will NOT open. I've ran into that twice on a couple of customers cars. 
As said, engine vacuum has nothing to do with the end carbs opening.
x2 - the gaskets can also hold the secondaries open... DAMHIK
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Question on 6 Pack Vaccuum requirement
[Re: superwrench]
#1484988
08/16/13 10:58 AM
08/16/13 10:58 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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why do you have the idle so low? I'd think you'd want it a tad higher. I'm running a solid roller, (588) I pull about 8-9 at idle (900-1000rpm) I'm running the stock MP 6-pack, I'm using 70main jets (probably a tad rich) 35 squirters, and purple springs. I'd probably go back to square one, set your timing in full at 36* early 2200rpm, turn you mixture screws all the way in them out a turn and go from there, tweak for best vacuum. You should also make sure your outboards are opening 100% Your build should fly. not sure how the billet blocks work, but it should run fine w/ or w/o them. I adjusted my primary w/o the outboards hooked up. Good luck
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Re: Question on 6 Pack Vaccuum requirement
[Re: lewtot184]
#1484993
08/16/13 04:02 PM
08/16/13 04:02 PM
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Joined: May 2005
Posts: 476
Mount Airy, Maryland
scrag
OP
mopar
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OP
mopar
Joined: May 2005
Posts: 476
Mount Airy, Maryland
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Well I took a the vacuum lines off and tested each carb - rear carb works like a champ front carb hisses....diaphragm is toast and it is my fault as I over tightened the cover when I was swapped the springs out....and of course no one in MD has a 135-6 diaphragm. I have one place left to try...thanks for the help. I am also going to spring is lt silver and not yellow btw...
Last edited by scrag; 08/16/13 04:03 PM.
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Re: Question on 6 Pack Vaccuum requirement
[Re: scrag]
#1484996
08/16/13 06:20 PM
08/16/13 06:20 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Well I took a the vacuum lines off and tested each carb - rear carb works like a champ front carb hisses....diaphragm is toast and it is my fault as I over tightened the cover when I was swapped the springs out....and of course no one in MD has a 135-6 diaphragm. I have one place left to try...thanks for the help. I am also going to spring is lt silver and not yellow btw...
I have one or 2 on my bench... except I'm in SC until Sunday. If you can't find one by then PM me. Advanced Auto has a complete re-build kit however it's like $35
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Re: Question on 6 Pack Vaccuum requirement
[Re: 62maxwgn]
#1484998
08/16/13 09:15 PM
08/16/13 09:15 PM
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Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
superwrench
master
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master
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
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Quote:
Have a few !!
Also,put a little grease on the screws,if not the screw can catch and tear the rubber around the hole if the opening is not centered over the hole.o
Like he says.... 
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Re: Question on 6 Pack Vaccuum requirement
[Re: scrag]
#1485002
08/18/13 09:39 PM
08/18/13 09:39 PM
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Joined: Feb 2005
Posts: 4,314
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,314
Prospect, PA
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Quote:
... I was told smooth is the word when it comes to secondary operation....
You were told wrong. If you are trying to maximize performance, you can only determine the best spring at the track. The springs that generate the lowest et, best mph, may, or may not be smooth on the street. Weight, gear, and converter play a key role in what springs are best, and whether or not there will be a sag when they come-in on the street.
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Re: Question on 6 Pack Vaccuum requirement
[Re: BSB67]
#1485003
08/18/13 10:25 PM
08/18/13 10:25 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Quote:
... I was told smooth is the word when it comes to secondary operation....
You were told wrong. If you are trying to maximize performance, you can only determine the best spring at the track. The springs that generate the lowest et, best mph, may, or may not be smooth on the street. Weight, gear, and converter play a key role in what springs are best, and whether or not there will be a sag when they come-in on the street.
what BSB67 says is fact. as far as the short yellows slowing a car down; the short yellows actually have a slower opening rate than the long yellows. this is per holley's info. i don't know why they even marketed them. i use purples for street use but yellows go quicker. from a standing start you won't feel any soggy spots, like from a kickdown, with softer springs. anything heavier than purples is worthless.
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Make sure those end carbs cycle freely... and another thing that might sound stupid......make sure the base gasket is on the right way otherwise the end carbs will NOT open. I've ran into that twice on a couple of customers cars. 
