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Old 01-06-2006, 06:53 PM
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Holley Double Pumper Question...

About six months ago I bought a 750 DP from a buddy of mine at work. It's a great carburetor and it's currently sitting on top a small supercharger I just installed. Anyway, I read somewhere that I should richen the jets about 4 sizes on the primaries and secondaries so thats what I did. As it sits now I have 74 and 84 jets with a 9.5 power valve. Everything seems to work well.

Today that same person handed a brand new Proform main body to try with that carb. I want to give it a shot and see how it works. I've read through some of the archived threads and the general opinion of them seems to be high but I didnt see anything that answered my questions though.

Here are my questions. This main body has features like adjustable air bleeds, something I know nothing about. What are the advantages to changing air bleeds? He also said it should be used with 4 corner idle mixture adjustment. What do you guys think? My current setup only has 2 corner adjustment.

Later
Matt
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Old 01-06-2006, 07:45 PM
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i believe the air bleeds are to fine tune idle. What are you doing with your car?
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Old 01-06-2006, 07:48 PM
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You got a leaky spark tube...
 
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It's a Chevy Blazer. I just like tinkering with it and trying new things. Seeing what kind of power I can get out of it. I rarely take it offroad so I'm not too concerned about losing bottom end. Besides thats what the blower is for...
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Old 01-06-2006, 08:06 PM
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if you don't mind and you can afford the down time play with it but i heard good thing too about them.
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Old 01-06-2006, 09:00 PM
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Changing air bleeds will help you manage the way the systems (idle) (main)respond. intermediate systems (circuits) with doms.

How fast they come in, how hard they come in etc.

You can use them to adjust mixture also.
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Old 01-07-2006, 12:40 AM
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what infomaniac said. the air bleeds control how fast and how hard your mixture comes in through your throttle range. not just the idle. but from idle to WOT. you need to know EXACTLY what your doing to get them right, or at least have the time and resources to "play" with them to see what works. Plus, with the blower, its going to be diferent then with an N/A engine. you'll just have to mess with it one weekend and see what works. let usa know how it goes!
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Old 01-07-2006, 12:45 AM
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I'll let you know, I'm going to order some other stuff for it before I put it together though. What about the 4 corner mixture adjustment, anybody know much about these setups?
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Old 01-07-2006, 12:53 AM
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4 corner adjustments... i usually seat the secondary screws and back them out about 1/2 to 3/4 turn, then the primaries i seat and pull out 1 turn and adjust from there, if you get a lean pop when you hit the secondaries then you'll know to pull out the secondary screws another 1/8th to a 1/4. remember you can still adjust the primaries with a vaccume guage, like normal.
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Old 01-07-2006, 12:13 PM
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Does anybody know where I could find secondary metering blocks for use with 4 corner adjustment? I've been flipping through Summit and cant seem to find anything.
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Old 01-07-2006, 12:50 PM
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Quote:
Originally Posted by Blazin72

Does anybody know where I could find secondary metering blocks for use with 4 corner adjustment? I've been flipping through Summit and cant seem to find anything.
Just use any PRIMARY metering block.

I like to use a vacuum gauge to set the idle screws. I preset them the same and then adjust each for max vacuum.
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