No, I don't have a secondary injector failure as far as I know. Several points- I had the injectors cleaned and flow tested. Primaries are 28 #, secondaries 40#- the engine
is a 13bREW- 93 twin turbo, but normally aspirated. I checked to see if all the injectors were firing by disconnecting all the other leads and running on mode 1, engine off and press program switch. They all are firing. Also ran the injector backup proceedure.
The engine runs well on the ground all through the power band, but in the air , after staging it is a bit rough and misses. My theory- the secondaries are not firing equally and need to be tuned in mode 4. The engine stages normally at MAP address 84, and transistions through that point pretty smoothly, and runs very smooth below that point. That's why I think I need a bit of rotor matching in mode 4 above the staging point using the EGTs.
I feel that I am making definate progress.
Brian Trubee
-----Original Message-----
From: Steven W. Boese <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sun, Feb 27, 2011 8:48 am
Subject: [FlyRotary] Re: EC2/ Tracy
The same thing can be accomplished without removing and exchanging the injectors by using the injector backup procedure.
Steve Boese
Hi Brian
You don't have a secondary injector failure do you?
If your Pri and Sec injectors are the same, how about swapping them and run on the secondaries under the staging point and see if she is smooth, thus confirming the Secondaries are OK.
Otherwise if you can run her up on the ground above the staging point and disconnect one sec and then the other, you'll be able to confirm the Sec's are OK.
So if after disconnecting a secondary there is no change, that injector is Duff. With the other one if she goes smooth, it would suggest the other Sec is Duff.
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