Mailing List flyrotary@lancaironline.net Message #60417
From: Chris Barber <cbarber@texasattorney.net>
Subject: Re: [FlyRotary] Re: PCM for EC2
Date: Sat, 30 Nov 2013 23:29:02 +0000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Cc: Rotary motors in aircraft <flyrotary@lancaironline.net>
Not stupid, something to look at. I've just gotten to a point to see it's causing a problem. Haven't had the opportunity to take a closer look yes. It is my back up unit so had had limited use. I will hopefully learn more if I make it out to the airport tomorrow on my day off. 

I miss having Tracy's engine monitor (EM2). I had not realized how much easier the tuning prices is with those ten little map bars showing the mixture. A stand alone O2 sensor is useful but not as much as the monitor. 

Chris

Sent from my iPhone 5

On Nov 30, 2013, at 16:53, "Mark Steitle" <msteitle@gmail.com> wrote:

Chris,

This may be a dumb question, but is the EC-2 program knob centered on the potentiometer's travel.  In other words, if you turn it CCW and it stops at 7 o'clock, and then turn it CW it should stop at 5 o'clock.  If it doesn't, then you need to re-center the knob so the pointer is correctly referencing the true position of the potentiometer.  If the knob has been installed incorrectly, you may think you have set it to go rich, when in fact the potentiometer shaft is still on the lean side. You push the button expecting one result, but you get the opposite. 

Mark


On Sat, Nov 30, 2013 at 4:24 PM, Chris Barber <cbarber@texasattorney.net> wrote:
Yes, it's back together. Seems the problem was what the good folks at Mazdatrix felt was the least likely reason (they have always been helpful). My rear stationary bearing was TRASHED.   I have torn the engine down, verified tolerances, replaced a couple of stuck side seals, and two apex seals that were slightly questionable in the rear housing. 

After not being satisfied with the adding more oil "solution" I said screw it.....or something similar, and just tore it down. I've said it before, and it is more so now, the idea of opening up the engine is easier each time. Perhaps naively so, but each time garners more confidence in ability and understanding. What seemed tricky and stressful before are now just steps in the process. Of course it's not lost on me that us have screwed it up before.  Any of y'all are welcome to come down and hold my hand as you inspect my work....ok, no hand holding but I value a visit from one and all. 

Obviously, the rear bearing (and gear) was replaced new as was the rear rotor bearing that showed slight wear. The front rotor bearing and front stationary gear bearing were fine. Since it was mentioned here, I verified the oil pickup tube was solid and installed properly as well as my mod to the pesky front o-ring. 

I have been able to clean up the overall install a bit more and am looking forward to fine tuning now that I have seemingly got the timing to play nice. 

The current issue is that the PCM is not responding as before. It seems to be related to the program knob. Ill position the knob, press the program button but don't get a response consistently. The program button seem ok as it primes in Mode 0 fine. Also, the mixture knob adjusts the mixture as expected. 

Chris

Sent from my iPhone 5

On Nov 30, 2013, at 10:21, "Mark Steitle" <msteitle@gmail.com> wrote:

Chris, 

So, I take it you have your engine back together.  Did you figure out the cause for the low oil pressure?  What was the fix?

Mark


On Fri, Nov 29, 2013 at 7:17 PM, Chris Barber <cbarber@texasattorney.net> wrote:
By any chance does any one out there have an extra PCM (Program Control Module) for Tracy's EC2 you are willing to part with and sell?

I have two, but one is with Tracy for repair (....the program button physically broke on my first PCM, he also has my EM2) and, as luck would have it, my second one is not responding properly to input from the Program knob.  The program button is ok, as I can prime the engine in Mode 0 fine, but when I try to tune in Mode 1 or 9, moving the knob and pressing the button give me sporadic results.

Thanks guys/gals, as I think I have banged out my recent set backs and have the engine seemingly running properly, sans proper tuning. 

......what are the odds???????

Chris Barber
Houston
832-818-2355


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