Vacuum Reading At Idle?

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Feb 9, 2004 | 05:11 PM

#11

FrestyleFC3S

Senior Member

Joined: Apr 2003

Posts: 2,259

From: Schofield Barracks, HI

i can fire mine up if you want....off the top of my head im usually seeing around -14 though

Feb 9, 2004 | 08:51 PM

#12

RETed

Senior Member

Joined: Nov 2002

Posts: 925

From: Honolulu, Hawaii USA

Stock ports - 18" or lower

Mild SP - 16" to 18"

Large SP - 12" to 16"

BP - 8" to 12"

Autometers are not the best vacuum/boost gauges out there.

If you have drastic vacuum readings before/after engine warmed up, it might be a loose hose.

-Ted

Feb 10, 2004 | 11:35 AM

#13

Cheers!

Senior Member

Joined: Nov 2002

Posts: 3,108

-380 mmHG at 750 rpm

Feb 10, 2004 | 02:15 PM

#14

RETed

Senior Member

Joined: Nov 2002

Posts: 925

From: Honolulu, Hawaii USA

Quote:

Originally Posted by Cheers!' date='Feb 10 2004, 09:35 AM

-380 mmHG at 750 rpm

That's about 15inHg.

-Ted

Feb 10, 2004 | 02:35 PM

#15

Fluid Dynamics

Senior Member

Joined: Dec 2003

Posts: 419

From: Corvallis, Oregon

I have a 3k mile rebuilt streetported S4 six port NA engine: .5 atm at 750 rpm (cold), .6 atm at 1000 rpm (cold); .55 atm at 750 rpm (warm) and .6 to .62 at 1000 rpm (warm).

.5 atm = 15.0 in Hg

.6 atm = 17.9 in Hg

The gauge is made by VDO.