CHTs - What is acceptable?

I feel as long as I keep it under 400 degrees except on
take off it should be ok. I drop

Can a cylinder heat up that much on takeoff? I have never looked.

"TripFarmer" wrote in message
...
I just don't buy that "airframe" stuff. A cylinder head can only take
so much temperature for so long before it gives in. 400 degrees is
400 degrees no matter what airframe it's in. If I'm wrong please tell
me why.........

I've got about 15 hours on 6 new Superior Millinieums and just put in my
first quart of oil since 2TT. I have a range of temps at cruise from
320 - 380. They dropped a lot after about the first 30 - 60 minutes of
break in and seem to have stabilized since to these numbers. The hot one
will run 400-410 in a full power climb in my PA28 235.



I take it you have a good engine analyzer like the JPI 700?

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


Trip


In article , says...


"TripFarmer" wrote in message
...
I just don't buy that "airframe" stuff. A cylinder head can only take
so much temperature for so long before it gives in. 400 degrees is
400 degrees no matter what airframe it's in. If I'm wrong please tell
me why.........

I've got about 15 hours on 6 new Superior Millinieums and just put in my
first quart of oil since 2TT. I have a range of temps at cruise from
320 - 380. They dropped a lot after about the first 30 - 60 minutes of
break in and seem to have stabilized since to these numbers. The hot one
will run 400-410 in a full power climb in my PA28 235.



I take it you have a good engine analyzer like the JPI 700?

"TripFarmer" wrote in message
...
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'm looking at $28K for a IO-550 Milleniunm exchange and I'm going to "baby"
those poppers. The previous owner of my bird had a JPI-700 and he got 1800
hours out of a IO-520 running LOP.


Trip


In article , says...

I take it you have a good engine analyzer like the JPI 700?

Nobody here can give you the correct CHT for your aircraft.
The engine manufacturer can, although it's like pulling teeth trying to
get it.

As a general rule, if you hold climbout to a max of 380CHT/1425 EGT and
cruise max at 350 CHT/1380EGT you won't seize or damage anything - that
is not to say that you will be at your most efficient - only that you
won't damage anything.

The most knowledgeable people I have found on this topic are Advance
Pilot Seminars. Walter Atkinson is one of their instructors and he is
often available at Cessna Owner Organization Forums.
I learned more about this subject from him than anyone else.
He teaches ROP leaning on carbs and LOP leaning on Gamis.
He really knows his subject and is the person that I recommend to answer
your question.

HTH

Tony
--

Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE


In article ,
(TripFarmer) wrote:

What is an acceptable CHT in cruise? How hot can one stay in extended cruise
flight? I've got 6 new ones and want to take care of them.


Thanks in advance.


Trip

TripFarmer,

What is an acceptable CHT in cruise?


anything below 400F. Have you read Deakin's columns on engine
management at www.avweb.com?

--
Thomas Borchert (EDDH)

I just printed them all out to read at home.

Thanks.


Trip

In article , says...

TripFarmer,

What is an acceptable CHT in cruise?


anything below 400F. Have you read Deakin's columns on engine
management at www.avweb.com?

--
Thomas Borchert (EDDH)

"TripFarmer" wrote in message
...
What is an acceptable CHT in cruise? How hot can one stay in extended
cruise
flight? I've got 6 new ones and want to take care of them.


Thanks in advance.


Is yours a turbo? What displacement?

Check out John Deakin's "Engine Series" at
http://www.avweb.com/news/columns/182146-1.html (specifically #'s 8, 18, 43,
63-66).

Never more than 400 degrees and typically at 370-390.

"TripFarmer" wrote in message
...
What is an acceptable CHT in cruise? How hot can one stay in extended
cruise
flight? I've got 6 new ones and want to take care of them.


Thanks in advance.


Trip


Our club's Skylane has one CHT gauge with a big 'ol green range & no temps
on it. Any recommendations on how to use this rather "useless" gauge?

Steven Barnes wrote:
Our club's Skylane has one CHT gauge with a big 'ol green range & no temps
on it. Any recommendations on how to use this rather "useless" gauge?

You don't, it is for reference only.
Lean until the engine starts to run rough, then enrich half- to one-turn
so it runs smooth again.