Vacuum Reading At Idle?

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02-09-2004, 05:11 PM

#11

FrestyleFC3S

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Join Date: Apr 2003

Location: Schofield Barracks, HI

Posts: 2,259

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

02-09-2004, 08:51 PM

#12

RETed

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Join Date: Nov 2002

Location: Honolulu, Hawaii USA

Posts: 925

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

02-10-2004, 11:35 AM

#13

Cheers!

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Join Date: Nov 2002

Posts: 3,108

-380 mmHG at 750 rpm

02-10-2004, 02:15 PM

#14

RETed

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Join Date: Nov 2002

Location: Honolulu, Hawaii USA

Posts: 925

Quote:

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

-380 mmHG at 750 rpm

That's about 15inHg.

-Ted

02-10-2004, 02:35 PM

#15

Fluid Dynamics

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Join Date: Dec 2003

Location: Corvallis, Oregon

Posts: 419

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.