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Old 01/14/2020, 06:49 PM   #1
Powell
 
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Location: Beaverton, Oregon
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low vaccum

Hoping someone can give me some help/info here. My brother-in-law has built me a 302 motor for my GT/CS. It has a "mild " cam that claimed to be without any worries with vacuum.
Upon start up we find the intake vacuum is only 8 inches of mercury, Running a Fitech fuel injection system and it runs poorly at idle,but nice on the drive. Problem is the low vacuum is not good for the power brakes. Any thoughts of adding a external vacuum pump to solve the problem?
Thanks in advance for any help.
POWELL
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Old 01/14/2020, 09:52 PM   #2
franklinair
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Location: Franklin, NC
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Summit Racing sells many models of supplemental vacuum pumps. 15"hg should operate vacuum requirements for PB booster & A/C vacuum controls OK.

Neil
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Old 01/15/2020, 10:36 PM   #3
robert campbell
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Please let me know the cam specs. Eight inches at idle is way less than a mild cam should deliver. I think you have some other issues other than the cam. Timing or fuel delivery problems.

We need more info. What dizzy and what is your initial timing? I think we can sort this out.

Rob
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Old 01/16/2020, 02:36 PM   #4
1968Cally
 
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Quote:
Originally Posted by robert campbell View Post
Please let me know the cam specs. Eight inches at idle is way less than a mild cam should deliver. I think you have some other issues other than the cam. Timing or fuel delivery problems.

We need more info. What dizzy and what is your initial timing? I think we can sort this out.

Rob
I agree. At this point, I would not be worried about the power brakes or an external booster. I would be worried that there could be a flaw in the engine rebuild.

Dave
'68 GTCS
8R01J140036 2/8/1968
C4/PS/PB/AC
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