Stock Vacuum at idle
Jan 9, 2006, 08:25 PM
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Stock Vacuum at idle
Hey guys, I just installed a boost/vacuum guage. Right now the car idles at 10-12 mm/hg of vacuum. Im wondering if this is normal because my last car idled at about 20 mm/hg. I also have 272 cams, I think that might play a factor.
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Indication of vaccum leaks?
Jan 10, 2006, 08:48 AM
#12
Generally a higher vacuum (more negative pressure reading) is better as it indicates a higher energy potential in the intake. In other words, the air is getting moved into the engine with greater force. With a longer duration cam, the potential goes down slightly, but the air has more time to enter and evacuate the engine -- thus higher flow.
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d
Jan 10, 2006, 09:36 AM
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Stock I pulled every bit of 20. Now w/ my 272/264 setup I pull between 15 and 18. I am down here in Auburn/Al, so I would assume I am not that far above sea level.
Jan 10, 2006, 10:09 AM
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Generally speaking you want between 15in/hg and 20in/hg (.51bar-.68bar). Normally if your vacuum is lower than that, you may have cam timing issues. Don't forget that most fuel pressure regulators (including ours) need at least 15in/hg to operate properly at idle.
Darin
Darin
Jan 10, 2006, 01:11 PM
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Originally Posted by Deepseadiver
HKS 272's and am around 10-11 mm/hg of vacuum.
Not to flame on en1gama19 but how can your vacum be 1.4 PSI? Is that right or do you need a new gauge?
Not to flame on en1gama19 but how can your vacum be 1.4 PSI? Is that right or do you need a new gauge?
Not 1.4psi, - 4.5psi. Read it again
