Received-SPF: pass
 receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com
Message-ID: <001001c61b8d$e490c770$2402a8c0@edward2>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-929970@logan.com>
Subject: Re: [FlyRotary] TCP Doesn't Work?
Date: Tue, 17 Jan 2006 12:46:05 -0500
MIME-Version: 1.0
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit

Thanks for the feed back, Perry.  The  lead fouling is the cause of our SAG, 
but with the stock plugs I used, I generally get 20 hours before SAG starts. 
But, as in your case, it will continue to get worst until you change spark 
plugs - did I ever tell you how many used spark plugs I have waiting for a 
good lead cleaning solution? {:>).  I fly mostly with 100LL and found that 
so long as I change the plugs ever 20-25 hours no SAG, might get to 30 
hours, but Tracy reported gets close to 200 hours on a set of plugs using 
Mogas.

Going to try some of this Hobbs #9 gun cleaning solution that I have heard 
removes lead and see if I can just soak them in it and get at least 40 hours 
off of a set.

Sounds like a neat way to control the mixture on the stock auto CPU.  Just 
put a potentiometer in the circuit and  ala! a mixture control.  Let us know 
how it works out.


Ed A

----- Original Message ----- 
From: "Perry Mick" <pjmick@mail.viclink.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, January 17, 2006 12:34 PM
Subject: [FlyRotary] TCP Doesn't Work?


> >Hi Perry,
>
>>Disappointed to hear that TCP did not work.  May I ask "in what regard?".
>>Did the O2 sensor degrade? - SAG occur?
>
>>I purchased this  product (Decalin) appears to function similar to TCP and
>>I noticed they say to clean the O2 sensor every 20 hours as well.  I have
>>not tried it yet, but intend to in the near future.
>
>>Ed A
>
> I'm running the stock Mazda ECU still. It runs the engine rich best-power
> all the time, automatically compensating for altitude. This is open-loop
> mode not using the O2 sensor. It only uses the O2 sensor below 3000 RPM,
> which means it's only using it while I'm taxiing or on final approach. In
> fact the wire to my O2 sensor is broken, doesn't matter, I'm not using it,
> and it has no effect on engine operation even at idle RPM. The ECU will
> still run the engine without it.
>
> The problem with 100LL is it fouls the leading spark plugs after about 4
> hours. The symptoms are exactly like SAG, just after takeoff with the
> corrupted plugs, there is a power loss and the engine is running only on 
> the
> trailing plugs. When it first occurs, I can throttle back a little for a
> minute or so, then throttle back up and it clears. As the plugs get more
> corrupted this will no longer work and the plugs need to be removed and
> cleaned.
>
> So on my long trip to Kansas last summer I was able to burn mogas all the
> way to Kansas and on the return until I got to Logan Utah. I had some
> Decalin TCP with me to try because the fouling problem is well known to me
> and I avoid 100LL like the plague. I was west of the Rocky Mountains so I
> had many more options to land on the way back to Oregon, so I put in 100LL
> and TCP since I had no contacts in the area to help obtain mogas. I didn't
> have quite enough fuel to get all the way home to McMinnville OR so I had 
> to
> stop in The Dalles to add a few more gallons of 100LL. By this time I had
> been burning 100LL for about 4 hours. Sure enough, as soon as I took off
> from The Dalles, big power loss. I circled the airport in the pattern
> throttled back until it cleared, then climbed out to the west over the
> Columbia river, everything fine from there to MMV. But I took the plugs 
> out
> and cleaned them before my next flight and tried to dilute the remaing 
> 100LL
> in the tanks with as much mogas as possible. At least in my situation the
> TCP did nothing.
>
> I've built a circuit to intercept and manipulate the airflow sensor signal
> to the ECU, for rich/lean control. It is installed in my RX-7 and works,
> eventually I will transplant it to the Long-EZ. Also considering a MSD
> system.
>
> Perry
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>