idle mixture setting.
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Elder User
Joined: Dec 2007
Posts: 526
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From: fallbrook ca.
idle mixture setting.
ok, so im trying to set up a new carburetor(new for my truck)
when setting the idle mix. you use a vacuum gauge, right. so which vac. port do i tap into? a
also i have a few open vaccuum ports, should these be plugged up?
when setting the idle mix. you use a vacuum gauge, right. so which vac. port do i tap into? a
also i have a few open vaccuum ports, should these be plugged up?
Elder User
Joined: Apr 2003
Posts: 502
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Yes, all vac. plugs should be plugged into something or capped off. You will want to find direct manifold vacuum-probably off the vac. tree at the back of the intake manifold. When I set mine, I check idle speed, timing, and vacuum. Go for the highest vacuum setting, while keeping your idle and timing in spec., engine operating temperature. You will find a "sweet" spot where it sounds good and have good vacuum and throttle response, your idle and timing should be close and not vary much by then. Next, you should set your idle mixture screws, say 1/8 turn rich. I do this because, if you set it for max. vacuum and leave it, it probably will be too lean. It takes a bit of monkeying around getting it all right, yet I've set multiple engines up this way, and it works good-for me at least! I've seen bad mechanics set carbs up by ear, then wonder why the brand new engine has glowing exhaust manifolds, then soon followed by burnt exhaust valves. Search around, theres alot of info out there!
Happy Tuning!
Happy Tuning!
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Freshman User
Joined: Jun 2004
Posts: 32
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From: Utah
anyone have any magic for a Edlebrock 650 carb tuning with the performer manifold? Seems really rich. Just installed a new HEI dist also.
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Thread Starter
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Elder User
Joined: Dec 2007
Posts: 526
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From: fallbrook ca.
well i just did it, its pretty straight forward. make sure you have all your vaccuum lines plugged into something, then tap into a vac. richen your mix until you achieve the highest vac rating possible, then back off until pressure lowers then return to the highest pressure you got. then richen you mix just a tad bit.
im not sure how you control your mix on a edelbrock, im a holley guy by force.
here you go this should help,
http://edelbrock.com/automotive_new/...ll/index.shtml
im not sure how you control your mix on a edelbrock, im a holley guy by force.
here you go this should help,
http://edelbrock.com/automotive_new/...ll/index.shtml
Elder User
Joined: Nov 2005
Posts: 597
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From: San Antonio, TX
Originally Posted by 79Supercab400
anyone have any magic for a Edlebrock 650 carb tuning with the performer manifold? Seems really rich. Just installed a new HEI dist also.