Jay,

I'm still running mineral oil. I do expect the CHTs to drop when
I go to Aeroshell. I've got 15TT since TOH now. One quart in last 13 hours.


Trip


In article TUHVc.59500$TI1.36466@attbi_s52, says...

Wish I did. I have an old analog 6 cylinder anaylzer.

If you want to protect your investment it would be HIGHLY recommended to
get
a good engine analyzer.

I'll second that motion. It's a tiny percentage of what your engine just
cost, and it provides invaluable data.

Trip and I have the same engine, both in PA28-235s. In my experience, after
observing my new engine with a JPI EDM-700 for several hundred hours, CHTs
of over 400 degrees are WAY out of normal range. I keep mine below 350, and
have no problem doing so.

In cruise they will settle into the 315-320 range. EGTs can range from 1350
to 1500, depending on leaning.

Now if you have only one cylinder out of line, it could be a sensor/probe
problem, or it could be a baffling problem. I sealed all visible holes in
my baffling with high-temp RTV, and saw my CHTs drop slightly, but
noticeably.

Good luck!
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"