Hi Al, I'm back from Sn'F but still in recovery mode. Great
fly-in, lots of talking about engines & airplanes, found brakes for my Kolb
Twinstar, wonderful flight to & from Lakeland. The Renesis humming
under the cowl had me wishing it was farther away.
From your description it sounds like the primary injectors (your
secondaries are on the primary drivers as I recall) are
not coming on line (no power?) Remember that all
running on cold start is with all injectors running even below staging manifold
pressure. The secondaries are probably the only ones running since engine
dies immediately when cold start is switched off.
Could also be a staging relay problem, no power being switched on
to secondaries (opposite problem of what I described above). Have
you kept engine running long enough to get warmed up? Does engine still
die then? Try turning mixture full rich when switching off cold
start.
Or, maybe the injector disable switch wiring has a problem (if you
installed this feature).
BTW, do you have latest 20B EC2 updates? Lots of good changes
in them.
Tracy (out of ideas for now)
Subject: [FlyRotary] Re: FI mystery
Since we are looking for something
obscure here I would check the voltage to the fuel injectors. Low
voltage would make for a lean mixture. Other items
are:
2. vacuum line
disconnected
Haven’t checked the
voltage to the injectors yet; so I can do that.
Checked - No vacuum
line leaks; no lines out of place. Leak in MAP line would give a higher MAP
reading and too rich a mixture.
Checked - No air
leaks – would take a major leak
downstream from the injectors to give these symptoms.
Fuel pressure is
normal.
Did you try both
controllers?
Tried both
controllers – same behavior. Looked at the mixture correction table on
the EM-2; things look normal. The mixture “map” would have to be WAY off
to require ‘cold start’ switch on.
The only thing I
noted as abnormal was that the EGT on rotor one was not stable; seemed to be
‘hunting’ around the values of the other two. Since the engine was
running smooth and steady, I attributed this to something related to the TC,
like poor connection, TC going bad, etc. I can find no connection
between this and a way to lean mixture w/o cold start switch
on.
Al (still
baffled)