Mailing List flyrotary@lancaironline.net Message #21402
From: rijakits <rijakits@cwpanama.net>
Subject: Re: [FlyRotary] Re: EGT temps
Date: Wed, 4 May 2005 19:07:49 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sorry, was sent off to fast - now it is edited!
----- Original Message -----
From: rijakits
Sent: Wednesday, May 04, 2005 7:01 PM
Subject: [FlyRotary] Re: EGT temps

We have been here before (...I think), you want to know everything about LOP operation got to: http://www.gami.com
 
Also the following reading is a good primer on the subject:
 
 
If not everything, at least the parts that concern detonation can be applied directly to the rotary ( or to any engine for that matter).
 
I didn't finish reading the turbo articles yet, but through #2, they are very interesting! So I just post the rest right away too!
 
If you got that far you might just read on through all of John Deakin's Pelican's Perch articles....
 
For me it will be LOP as often as possible, however please note that it is pointed out, more than once, that you will need rather precise sensor/indication equipment and well balanced injectors. How ever as most on this list run Electronic Engine Controls, this is mostly basic equipment anyway. Setting up the controller correctly for LOP is the challenge, .....I think :)
 
Thomas Jakits
----- Original Message -----
Sent: Wednesday, May 04, 2005 5:04 PM
Subject: [FlyRotary] Re: EGT temps



David Carter wrote:
A point I like to think of is that 50 or 80 degrees "from" "peak" on the rich side and on the lean side is, the same temperature.  For piston engines, running 50 deg lean of peak is the same temp as running 50 deg rich of peak, so the valves are seeing the same temp - so why are some engine "gurus" so adament about cruising 50 deg rich of peak?  It makes no sense to me.
 
So, I believe there is no such thing as "EGT too high".  There is only "peak EGT", whatever it is for  your installation.
 
David

If you look at the lycoming temp/power graphics that seem to make their way around this board, you will notice that while 50..(or 80) degrees rich OR lean of peak are the same temperature, their effect is NOT the same. The Cylinder Head Temps in the rich of peak equation have been documented to be hotter, and "best power" occurs on the rich of peak side, not AT peak EGT or lean of peak. Now, we HAVE water cooling to help attenuate the temps the block attains.. but the lesson to be learned is that running on the rich of peak side results in more heat generation which is more heat that must be dissipated.
 
The air cooled guys dont/shouldnt climb lean of peak primarily to avoid detonation and to use fuel for cooling. We probably could, but it helps to be aware of the events at play.
 
Dave

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