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I just replaced the vacuum pump on an IO360 and on the initial runup the
gage
indicated only 1-2" at idle, 3" at 1200 rpm, 4" at 1400 rpm and 5" at higher
rpms. This is less vacuum at low rpms than the old pump produced
which is why I replaced it to begin with - and the fact that it had almost
1000 hrs on it.

Is this the typical performance of vacuum pumps at low rpms? The old pump
was an Airborn  211CC, the new one is an Airborn 215CC (new, not remanf). It
is only driving
the AI & DG.

My concern is that while sitting for an extended period waiting for an IFR
release or at any prolonged time at idle, the gyros will start spinning
down.

I have not had a chance to fly it due to pea soup fog all weekend. Perhaps a
new pump
gets better after 15 minutes of running?

Neal Garvin
ngarvin@home.com





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