Hi Paul-

 We're running crazy-rich on the 13b right now.  We lean the EC2 fully &
 still think we could go leaner for nice smooth running.  We've come to the
 conclusion that the injectors are pumping way too much fuel in (moving the
 throttle 1/4" will send us zooming from 2300rpm - 4500rpm).

 I'm going nuts trying to find the specs for the fuel injectors we have on
 there.  Can't find the Mfr/Model to save my life -- do you happen to
 remember from way back when?

 Anyway - we're going to try turning down the injector flow rate & see if
 that makes our throttle less touchy & lets us not have to fully lean for
 smooth running.

 Also -- egts on the two rotors are off by ~100F.  We think that also
 suggests the injectors are not right.

 Mark (Rocky Mtn High)

 Try lowering the injection pressure.
 The injectors are GM/MSD as I recall.

 Paul Lamar
 --


Mark,

If you don't have a prop installed you will have a very touchy throttle, to
the point that you could easily over-rev the engine.  Basically, you're
running without a flywheel.  If this is the case, be very careful running
in
this mode.  And forget trying to do any tuning with  no load on the engine.

Mark S.

I think he has the prop on there Mark. He mentioned "blade" when the
engine started as I recalled. That is good info however and it confirms
my theory on aircraft engine simple fuel injection systems. A car EFI
engine will
run well with or with out a load.

Paul Lamar



Yep, we're well aware that running the engine with no load would qualify as
a "very bad thing".  The prop is installed.

I'll be checking the fuel pressure tomorrow to see if it's too high &
causing the excessively rich mixture.  If that's not it, I'll try reducing
quantity from the injectors.

Mark (Rocky Mtn High)