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I'm getting pretty much the same thing, I was out today doing some ground running and specifically was looking at EGTs. Running above the staging point, I'm getting EGTs that are very close to each other, within 30 degrees, but I am seeing that rotor one EGT temps bounce around quite a bit, like 20-30 degrees in a time frame of a second. I believe that it is a sensor or wiring error of some sort. The #2 rotor EGT stays pretty consistent. At near full throttle settings I am getting some missing, not so much on the ground, it's more pronounced in the air. I'll do some more checking on it in flight. The last time I flew, the tower called and said they had calls from the town that I was flying over at 5,500 AGL from people who said there was a plane in distress with engine trouble.
So, my EGTs are very close up and down the powerband and through the staging point, maybe there is a spark related issue up at high RPMs. More testing in a few days.
Brian Trubee
-----Original Message-----
From: Tracy <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sat, Mar 5, 2011 5:10 pm
Subject: [FlyRotary] Re: Miss above staging point.
Use those instruments! What happens to the EGTs when passing through the staging point? Data is better than guessing.
Tracy
On Sat, Mar 5, 2011 at 5:56 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
I have developed a miss above the staging point. The fuel pressure seems ok, the mixture also seems ok. I am at a loss.
To try and troubleshoot, I am considering getting above the staging point and disabling the primaries and secondaries to see if I can identify which is the cause. Since it runs ok below the stage, I assume it is not the primaries.
I recently changed my fuel filters and installed a large canister filter. There seems a possibility that I introduced some contamination that clogged an injector. Other wise it seems it must be spark related. This just happened one flight ago. The engine was running fine, till that last takeoff. It was missing and would only get about 6300 rpm. After take off, I turned the prop back and slowed the engine down to below that number and it smoothed out and ran fine the res of the flight. Today while taxiing around, I noticed that the miss was back.
Opinions welcomed.
Bill B
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