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Idle Characterists of 0" of Vacuum

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Old 09-03-2009, 10:01 PM
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Default Idle Characterists of 0" of Vacuum
Wondering about what the title says.....
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Old 09-03-2009, 10:12 PM
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Originally Posted by ls1290
Wondering about what the title says.....
They rattle a lot and require diesel fuel. Some have no rattle, but require JET A, very similar to kerosene. What is your question.
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Old 09-03-2009, 10:19 PM
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Originally Posted by gametech
They rattle a lot and require diesel fuel. Some have no rattle, but require JET A, very similar to kerosene. What is your question.
Did you read the title.....
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Old 09-04-2009, 01:00 AM
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Isn't that just ambient air, like maybe a motor that is shut off?

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Old 09-04-2009, 01:09 AM
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Probably would be lumpy as hell but I doubt the motor could run on its own? Why do you ask?
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Old 09-04-2009, 06:20 AM
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If it truly had 0" of vacuum at idle, then cracking the throttle open would make no difference at all.
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Old 09-04-2009, 05:06 PM
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Right, it's a motor that isn't drawing any air, or its idle speed is also its WOT speed which is unusual to say the least.

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Old 09-04-2009, 05:33 PM
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Looks like maybe a trick question. 0#'s of vacuum is no vacuum or 101 KPa. 0" inHg is 14.7#'s of vacuum or 0 KPa.
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Old 09-04-2009, 06:42 PM
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It wouldn't "idle".
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Old 09-04-2009, 06:59 PM
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ok so no restriction from a throttlebody, and something else controlling the engine speed electronically lol.
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Old 09-04-2009, 07:20 PM
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no i think he means a supercharger putting out enough boost at idle to make 0 psi instead of vaccuum like a turbo or smaller supercharger would have at idle.
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Old 09-04-2009, 07:45 PM
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Originally Posted by KILLER-LS1
no i think he means a supercharger putting out enough boost at idle to make 0 psi instead of vaccuum like a turbo or smaller supercharger would have at idle.
No, because if 0 psi got into the intake plenum, it wouldn't be at idle any more.
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Old 09-05-2009, 01:35 AM
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Maybe his cam is so big it would have no vacuum

296/299 .868 .976 099lsa














j/k!
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Old 09-05-2009, 01:23 PM
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Maybe he just has a bad MAP sensor. LOL
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