Steve,
(assuming you are using the EC2 AND that you are using a proper 3
port fuel pressure regulator which adjusts pressure with manifold
pressure) I also assume you are saying that mixture is too rich even
though the mixture control is at leanest setting?
If you have already adjusted the mixture as lean as possible at low
throttle using Mode 1 or 9, you need to do the following:
On the ground with airplane restrained, run engine at about 25" Hg
MAP. In Mode 3, LEAN the mixture about 3 - 4 steps.
Go to low throttle where you were too rich and see if mixture can
be made right using Mode 1 or 9. If not, go back to MODE 3 and
adjust leaner a couple of steps.
Repeat until you can get mixture in proper range at low
throttle.
After doing this, you may find that mixture is too lean at higher throttle
settings. If so, adjust richer where needed using Mode 1 or 9.
Make sure you know exactly how the different Modes work. They are not
the same. See instructions for details.
Change injectors and other hardware only after you are sure the problem
can't be solved by adjustments.
Tracy (working on automatic program mode for EC2)
----- Original Message -----
Sent: Tuesday, December 14, 2004 9:07
PM
Subject: [FlyRotary] Injectors
One nagging problem that I have is the engine running rich at
low power
levels. I've turned the fuel pressure regulator down to 30
lbs to get it
reasonably lean, but I still don't have enough
adjustment. The higher power
levels have a pretty good mixture on the
default tuning.
Right now I'm running the stock 550cc injectors, but
I'm considering
changing the primary injectors to 440cc, to help the low
end mixture, and
leave the secondaries at 550cc, so that I still get
sufficient fuel flow
with the turbo at higher power settings.
My
thinking is that the 440cc injectors would allow me turn the fuel
pressure
back up to 38 lbs. and hopefully still be able to tune the lower
end where
only the primary injectors are supplying fuel.
Does anyone have
experience doing this, hopefully with a turbo, or just have
an opinion
?
Steve Brooks
>> Homepage: http://www.flyrotary.com/
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