John, let’s clarify your previous statement “ I turned of
the fuel pump and with the injector switch's off the engine continued to run
until the fuel press was down to 17 pds. and quit.” Do
you really mean BOTH INJECTORS are OFF and the engine keeps running? Does your
system automatically switch to carburetor if the fuel injection system is
disabled or fails? Or do you have to take manual intervention to switch from
one to the other?
Your manifold pressure and EGT behavior are normal for a misfiring
engine.
I doubt there is anything wrong with the injectors.
There was a lot of discussion about 2 months ago on primary and
secondary injectors above and below staging point – you may want to
review some of that. However, if your EC2 is wired as per Tracy’s
recommendation it doesn’t matter whether PRI, SEC or BOTH are on below
staging – the DPDT switches take care of that, but above staging BOTH
should be ON. You also need to know where your staging point is in terms
of manifold pressure. Default is ~15”; I increased mine to 17” and
some guys have set it to 20”.
Steve’s comment about the pressure regulator may be the
key …
Jeff
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John
Sent: Friday, September 18, 2009 3:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Mixture condition
Jeff,
I went back out and ran the engine again. The fuel pumps are T-eed of
after the gascolator and go to the separate fuel systems, the Weber is on top
of the engine, above the fuel level in tank. I ran the engine on fuel
injection and it was working fine when it was cool. I shut off the
primary injector switch and the engine quit immediately like it had always done
in the past, but when it go warm (190) and started missing, it ran a lot better
with the injector switch off and when I turned the injectors back on it was
missing terrible and this time I noticed that the Manifold pressure creep up
from 13# to 24# and the EGT on the #1 rotor went down to the bottom of the
scale. I tried the scene 3 times and the results were the same each time
with the primary or secondary injector switches on. Like wise it is
a big question to me, as to the change in function in the injector
switches.
Could
it be that the computer is flooding the #2 rotor and the reason it doesn't quit
when I turn the mixture to full lean at 2000 rpm. It does run a little
better at higher rpm's (like 4000).
The
injectors were reconditioned ones that I got from Bruce T and I'm thinking that
the #1 primary injector may not be working when it gets hot. On the other
hand, doesn't the secondary system take over, or is that only at higher rpm's.
If
it is a ground condition, it seems like it wouldn't wait until the engine is
hot to quit working, it would be happening at any time. JohnD