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On 24 Nov 99, at 9:57, Erkson, Toby wrote:
> Would some one please give a detailed list for when there is a
> vacuum/pressure in the intake manifold? High and low values, load/no load,
> open/partial/closed throttle positions, etc. A chart format would be nice.
Sorry, don't have a chart, but here is a summary.
In a normally aspirated engine, the intake manifold pressure is
always less that atmospheric. the greatest vacuum (lowest
absolute pressure) occurs under engine overrun at high RPM, while
the least vacuum (highest absolute pressure) occurs at low RPM
with WOT. On the road the range you can observe may be nearly a
full atmosphere, but working on your car in the driveway you will
only see maybe 1/2 - 2/3 atmosphere.
Jim
-
Jim Adney jadney@vwtype3.org
Madison WI USA
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