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Anyone know what stock vac should be?

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Old Aug 25, 2006 | 05:27 PM
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wags rx7's Avatar
wags rx7
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From: maineville
Anyone know what stock vac should be?
i have been wondering and no one has hit on it. I have an autometer *crap gauge* but it reads around 19 or 20 vac is that normal or what should it be?

thanks guys you know everything.
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Old Aug 25, 2006 | 05:48 PM
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That would seem a bit high as a healthy stock motor runs between 15 to 17hg. What kind of boost readings are you getting ? are they a little low ?
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Old Aug 25, 2006 | 06:13 PM
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Stock Vac at what RPM?
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Old Aug 25, 2006 | 06:18 PM
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http://fd3s.net/boost_test.html
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Old Aug 25, 2006 | 07:42 PM
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i get about 19 -20 vac at idle and the boost goes 10-8-10
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Old Aug 25, 2006 | 09:49 PM
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Thanks Majik for that. I've been a little worried about my Vac readings at idle but compression tested out fine. Never considered that my streetport was a contributing factor to low vac.
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Old Aug 25, 2006 | 11:58 PM
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Yup, my heavily ported motor pulls 10 to 12 inches vacuum at 900ish rpm, compression was 105 psi at all faces. That link is spot on
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Old Aug 26, 2006 | 12:28 AM
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i've heard about porting affecting vaccum readings, but would a lower restriction intake filter/port matching change it at all? seems like that would make less restriction, so vacuum would be lower.
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Old Aug 26, 2006 | 10:07 AM
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My bridgeport is about 10-11 vac at 1100 rpm that wright up is on
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