John, I presume you are using a Manifold
Pressure gauge and not a Manifold vacuum gauge? In the old days past it was
common to find manifold vacuum gauges on automobiles rather than the manifold
pressure gauges used by aircraft engines.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of John Downing
Sent: Sunday, September 21, 2008
8:19 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Manifold
vacuum gauge
Today I sorted out the wiring and everything is now
working. The only problem is that the manifold vacuum gauge is reading
backwards. I tried changing the plus-minus wires around on the back of
the gauge and it reads nothing, even with vacuum applied. The question is
what happens if I switch the power and ground wires around, does that do
anything besides blow the fuse or the gauge. Will run the engine again
tomorrow with the ole steam gauge and try and get a start on the EC2
tuning.
One other question, does the vacuum lines to the EC2
need some kind of pulse chamber, like a small fuel filter or orifice in each
line. JohnD
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