Oops, Manifold vacuum is MINIMUM at great load!
Remember: Vacuum is the opposite of pressure.
The absolute pressure of the manifold is smallest at idle, and max
(almost the same as atmospheric pressure) at full power.
The amount of gas/air entering the cylinders is roughly
proportional to the manifold pressure.
Supercharged cars can have a manifold pressure GREATER
than atmospheric. This sort of means that their
manifold vacuum is less than zero at high power...
Doug Braun
'72 Spit
At 04:39 AM 8/16/00 -0400, Trevor Boicey wrote:
> One is manifold vacuum, which just measures the vacuum
>in the intake manifold. It's highest at idle and at
>great load, and relatively low at cruise.
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