The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

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 Vacuum gauge reading 
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Joined: Thu Jul 29, 2004 2:12 pm
Posts: 728
Location: Indio, California
Post Vacuum gauge reading
What would be considered a normal reading on a vacuum gauge when connected to the intake? How steady should the needle be on a good engine?


Fri Sep 22, 2017 10:04 am
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Joined: Sun Sep 25, 2011 11:19 am
Posts: 590
Location: Woodside, CA
Post Re: Vacuum gauge reading
Assuming your vacuum gauge is calibrated in Inches of Mercury, at idle 800 -- 1,000 RPM should be about -17 to -20 InHG.
MAP readings are going to be strongly dependent upon load and RPM (and leaks).

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Fri Sep 22, 2017 1:48 pm
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