vacum
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Joined: Oct 2007
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From: punta gorda florida
vacum
I recently installed a new stage 2 qjet from Jet performance I carb looks great and works very well but what i did notice while setting the idle mixture was that i had about 1 1/2 inches less vacum on the guage they did provide a new base gasket and its 1/4 inch thick my question is where did that vacum go I have a cam that has .465 lift intake 224 duration on intake and .468 lift and 234 on exhaust weiand dual plane intake manifold long tube headers and patriot alum heads oh cam is flat tappet made by elgin use to run 15 in. of vac with old carb and regular gasket
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From: punta gorda florida
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When I switched carbs last month my vacuum at idle changed 2 hg and I had no vacuum leaks on either so I believe it can change that much just by switching to a different carb.
Last edited by Fishndude; Aug 2, 2009 at 07:14 AM.
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From: punta gorda florida
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Burning Brakes
Joined: Jul 2009
Posts: 1,132
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From: A town SC
Vac
Take carb spray and shoot the base plate, intake where it meets the head and any other suspicous areas. The car will stumble or jump in rpms when and if you find a leak.. Also check brake booster by plugging or by passing it, there known to leak. If no leaks are found i would rule it the carb . THE CAR NEEDS TO BE AT IDLE FOR THE CARB SPRAY TEST :0)
Thread Starter
Pro
Joined: Oct 2007
Posts: 549
Likes: 5
From: punta gorda florida
Take carb spray and shoot the base plate, intake where it meets the head and any other suspicous areas. The car will stumble or jump in rpms when and if you find a leak.. Also check brake booster by plugging or by passing it, there known to leak. If no leaks are found i would rule it the carb . THE CAR NEEDS TO BE AT IDLE FOR THE CARB SPRAY TEST :0)