Hi John,
I believe Tracy
is out in Colorado
at this time, so don’t know if he is able to monitor the list from his
mountain top cabin or not. Personally, I would be hesitant to fly
(particularly a first flight) with anything amiss -particularly like the engine
flooding. Yes, you may disarm the problem by pulling the circuit breakers
to the injectors, but if you do not know what is actually causing the problem
then you can not be absolutely certain that action will prevent it from occurring
in flight.
Two things I can think of that might cause
the injectors to hang open – either something is causing the EC2 to hold open
the injectors OR an electrical short in the leads from the injectors to the EC2
is somehow getting grounded. Either one could cause the injector to stay
open. Pulling the CB power to the injectors should prevent them from
being opened either way – Provided there is no other way for the
injectors to get power to them. Depending on how the injector disable
switches are wired to power and the circuit breakers – you might actually
have two power sources (one unintended) to your injectors which could be
causing the problem.
You might try connecting a volt ohm
meter on one of the primary injectors electrical connection and try turn on/off
your CB to make certain it does remove the power to the injectors – also try
flipping your injector disable switches on/off to check that they don’t
somehow provide power when the CB is pulled.
Play it safe, John.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of John
Sent: Wednesday, May 19, 2010 9:51
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] fuel
injection
Tracy, this
morning I got the Tailwind out for the first flight, started it up and every
thing looked like a go, the wind has finally subsided. Went to the house
to tell my wife and went out to go. On start up the engine was flooding
bad, so I shut of the primary and secondary injector switches and the engine
leaned out enough to stay running. From past posts it is my understanding
that the injectors are activated by the ground, is this correct. This is
the same way it acted last fall when I changed the injectors, some thing is
causing them to stay open, apparently when things get up to temperature and it
sits for a short period of time. The wiring harness is one of Bob Whites
and is wired according to his diagram, which I have checked several
times. I noticed that the mixture and program knobs do not function
with the injectors switches off.
If I pull the fuse to the fuel injection system, can I fly
on the Weber carb, it runs well with it. If I can get the 40 hrs flown
off, maybe I can get it down to Mason and have David check it out, as is
beyond my capabilities. JohnD