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Message
Al, if the wiring of your injector switches are to
Tracy's diagram, then any time you turn off either set of injectors (staged of
not) the other pair will come on (unless. of course. their switch is also in the
OFF position). When only a single pair are working above the stage point
the injector duration is doubled (to make up for the pair not
injecting).
I had similar symptoms that about drove me
batty. The engine simply acted as if it were too rich at low rpms and the
secondaries were on below the point they should have been. If I leaned it
out enough to cure this problem, the high end would be too lean.
This WILL happen IF the pressure sensor is
not seeing manifold pressure. In my case, I though I had pushed the
manifold hoses on the barbs of the sensors but in reality had apparently shoved
them between some board components.
But, for whatever reason, if the manifold pressure
is not present at the sensor - then you are staged!
I have not asked but presume you have tried the "B"
controller. In my case, it made no difference because neither pressure
sensor were sensing manifold pressure. But, if one is connected then
switch controllers should make a difference (if this is the
problem).
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Saturday, August 28, 2004 1:47
AM
Subject: [FlyRotary] Re: Engine run
I guess I didn’t
realize that the secondaries would turn on below the staging point, but the
thing that puzzles me is that turning off the secondaries reduced the rpm and
made it rougher. So apparently they were on even thought the MAP reading
was 13.1. Something fishy.
That is fishy
alright. Might be a good time to go through the injector and switch
wiring again.
Good
luck,
Yeah, but these are
the same wiring harnesses, connected the same way as on the dyno – and it
worked fine there. OK; its worth some further checking. It is
always something you least expect.
Al
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