[s-cars] Re: vac at idle

[Robert Myers]

Calculation error, Sean.  420 mmHg = 13.4 inches of Hg not 16.5.  Remember 
that the Inches of Hg vacuum scale is a negative or inverted scale where 
zero inches of Hg corresponds to an absolute pressure of 760 mmHg and 29.92 
inches of Hg corresponds to zero mmHg.

29.92 inches of Hg - (420 mmhg/25.4 mm/inch) = 13.4 inches of Hg

William, if you have a vacuum leak it is a quite small one.

At 08:50 PM 5/17/2005, Sean Douglas wrote:

>Bill asked:
>
>What is a normal vacuum reading at idle.  On my autometer boost/vac guage I
>consistently get 15 inches of vac. What should I be getting?  I've heard 
>17 is
>normal.
>
>Bill: I get 420 mm Hg on my Greddy electronic gauge which equates to 16.5
>inches of Hg.
>
>Sean Douglas
>1997 S6//RS2
>
>
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