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Message
I follow that, Steve.
That sounds like a possible reason why my idle is so
"sloppy" below 2000 rpm. It acts like its overly rich but when I attempt
to reduce the fuel ratio by reducing the mixture control the engine
dies. So when I reduce the mixture and it drops the pulse duration below 2
milliseconds the engine dies - but 2 milliseconds provides too much fuel at
idle.
I wonder if Tracy now flying with a Renesis engine does
not have this problem because I believe the primary injectors on it are around
250 cc/min compared to my 460 cc/min. So nearly 1/2 the fuel flow per
millisecond than my injectors. So two milliseconds on the 250 cc/min
injectors may be OK at idle but 2 milliseconds on 460 cc/min is just too
much.
Thanks for pointing that out Steve. All is becoming
much clearer.
Ed
----- Original Message -----
Sent: Saturday, March 10, 2007 10:44
PM
Subject: [FlyRotary] Re: The truth??? /
Injector flow rate mystery solved
Ed and
George,
In my plane, at
least, injector open times need to be less than 2 ms at idle and just above
the staging point. This is not
possible with a minimum open time of 2 ms due to the delay on closing. You can program the EC2 for less than
2 ms but the hardware is unable to do this. That means that the problem can’t be
fixed with software or programming different values in the map table. A shorter close delay time is required
unless you lower the flow rate of the injectors by changing the injector
itself or lower the fuel pressure.
The injector open time is at least 2 ms or it doesn’t open at
all.
Steve Boese
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