[Diy_efi] crankcase vacuum control

[Brian Dessent]

md4etal wrote:

> > Inches in mercury, is not a unit I'm used to, I note some have commented
> > 10-15" of vacuum but where is that in relation to?
> >
> Atmosphere is 31.92" Hg absolute pressure or 0" relative.  10" of vacuum
> from the zero reference is 21.92" Hg absolute.  Ill leave you to the
> engineering units/books to get it to bar.

Here's a chart I made a while ago with all the common pressure units. 
All the values in a row (i.e., across) are equivalent, so 1"Hg = 13.595
inches water column  = 3.386 kpa, etc.

   inHg   inH2O     kPa     bar     psi     atm
  1.000  13.595   3.386   0.034   0.491   0.033
  0.074   1.000   0.249   0.002   0.036   0.002
  0.295   4.015   1.000   0.010   0.145   0.010
 29.530 401.463 100.000   1.000  14.504   0.987
  2.036  27.680   6.895   0.069   1.000   0.068
 29.921 406.782 101.325   1.013  14.696   1.000

Brian

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