From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Sunday, April 09, 2006 8:27
AM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
FI mystery
I put about 4 - 5 hours of time
on my engine installation months ago, and had everything pretty much “dialed
in” for proper running from 1000 rpm up to max static rpm (~5200). Then
it sat with no running for about 6 months while I did upholstery, paint and
other stuff in my life. I’ve moved the plane to the airport, and got it
all assembled. Yesterday rolled it out for an engine
run-up.
Since the beginning it had
always fired off after a few strokes, and I’d turn off the cold start switch
seconds after it was running. This time I had difficulty in getting it
started. Once I got it running, it would quit immediately when the cold
start switch was turned off. Leaving the cold start “on” it runs fine
above about 2000 rpm with the mixture turned toward lean to about 9:00
o’clock. Reducing rpm lower it wants to die. As I increase rpm above
2000 I need to rotate mixture knob significantly toward to richer to keep
things smooth.
Fuel pressure, MAP, ignition,
etc. all are normal. When I get the mixture knob adjusted it is smooth,
so injectors are working on all three rotors. I didn’t take it above the
staging point so it is running on one set of injectors. Haven’t had a
chance yet to look at the mixture map on the EM2, and won’t get back to the
airport until Monday.
I’m a bit baffled on what could
have changed since last operation and what to check. Anybody have any
similar experience? Ideas?
Al