JVanLaak(at)aol.com
Guest
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 Posted: Thu May 11, 2006 2:32 pm Post subject: Electro-air failures |
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List,
I had one Electroair system on a previous RV-6 built in the mid-90s. It was
a beautiful installation (I was not the builder) and worked beautifully most
of the time. Then I had a series of incidents when during high climb in
cool weather the engine would begin a severe knock and vibration together with a
loss of power. Naturally I would retard the throttle until the knocking
stopped, usually about 20 inches or so.
I went through many steps trying to find the source of the problem. Timing,
plugs, ignition unit, wires, valves, etc. etc. After I found a loose plug
where the primer goes into one of the cylinders (causing it to go lean when
the cylinder heated up quickly) the problem seemed licked. The plane was sold
in the early summer to take care of college expenses for my daughter and the
new owner was thrilled with the plane.
But when the cool weather came back he started to have the problem I just
described on an intermittent basis. I felt bad that I had sold a problem to
him but he loved the airplane so much he could not be angry. He eventually
figured out that the manifold pressure sensor had some kind of an intermittent
failure mode that was causing the problem and its replacement has removed the
problem.
Bottom line is I liked the system very much but this intermittent problem
severely impacted the value of the airplane. The step I could have taken but
did not was to replace the system totally or with a mag.
Jim
Flying RV-6 N79RL
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