Don't have a solution short of building a new intake or a really tight
airbox with longer air feed path to throttle body. Just one more reason I
don’t like injectors on the far end of intake.
I can confirm that most people vastly underestimate the violent
activity (including reverse airflow) in an intake system.
Last point: It is not possible to program the EC2 to run only on the
secondaries with the staging level . Did you really mean
primaries? You could accomplish what you wanted by disabling
the unwanted injectors if you installed the disable switches.
----- Original Message -----
Sent: Thursday, October 28, 2004 12:40
AM
Subject: [FlyRotary] There I was, half
way to Vegas...
So as you know I have converted to a normally aspirated state. I
went flying to vegas this weekend, and actually won $300 net even after my
wife lost $100.
The engine ran as well as coulld be expected considering my sea level WOT
MAP is only 28". Max n.a. static is 46-4700 RPM. Plenty enough to
take off well over Van's recomended gross and fly at 130 KTAS (using only 8
gal/hr). Better than a typical cessna - but less tan I had with the
turbo. Anyway,
The point of this e-mail is to discuss injector backflow... I have
always had a problem with a faint fuel smell in the cocktpit. As part of
the n.a. conversion I removed the plenum over the intake (see pic.).
Every flight since removing that plenum has included a rather strong smell of
fuel coming in theough the passenger air vent. This smell is only
evident after take off. It turns out that my TWM secondaries, mounted on
a downhill part of the intakes, freely leak fuel down and out of the
bellmouths even during WOT operations. This leaked fuel then seeps out
the cracks in my cowl and goes into the passenger air vent. It also
loostly covers everything on that side of the engine, and the side of the fues
around the pax air intake with 2-stroke oil. This was enouth to make me
uncomfortable. The wife, who is still reeling from the emergency landing
after the turbo broke, now states that she will only fly cessnas from now on -
due to the very disconcerting smell of fuel the whole trip - and I can't
blamer her.
While in vegas I tried to program the 'B' computer to use the secondarys
only above 27" MAP but I guess the adjustment did not take because we still
had the same condition on return. I have checked and re-checked the fuel
system far any evidence of a leak. It is coming out the back end of the
intake for sure.
Something to think about if you are installing the TWM injectors near the
air inlet end.
Dave
Leonard