What is the cylinder temperature red line on Lycoming 320/360's?

 

Gary

----- Original Message -----

From: Colyn Case

To: Lancair Mailing List

Sent: Thursday, May 30, 2013 8:58 PM

Subject: [LML] Re: Lancair 360 CHT during climb

Giles, 

I don't know what it takes to get CHT's on a  360 in range but the real question is what does the engine like?  GAMI/APS argue that the metal of the cylinders is getting steadily softer as you go up in temp so they like to see 380.  The engine mfg's tend to list higher numbers and say that those numbers are considered in the engineering.  Personally, I run my (IV-P TSIO-550) engine hard but I don't like to see more than 380.

I think Grayhawk posted a chart a while back that plotted cylinder strength vs. temp but I can't find it.    I did find this article by Mike Busch in which he says that at 400 degrees the cylinder is half as strong as when cold and makes a number of other points about CHT's.   http://www.avweb.com/news/savvyaviator/savvy_aviator_59_egt_cht_and_leaning_198162-1.html

If the engine cooling is adequate, higher CHT's tend to correlate with higher internal cylinder pressures which can result from timing that is too far advanced or mixture not rich enough or not lean enough.   Your A&P should be able to address those but make sure he follows manufacturer's recommendations on the fuel setup.  I've seen more than one mechanic set the fuel flow way below manufacturer's recommendations.   (Too high will ruin your day too).

If you have not taken the Advanced Pilot Seminars course on engine management,   I highly recommend it.  It's available on line at www.advancedpilot.com.

If the engine cooling is not adequate, then hopefully one of the 360 guys can tell you how to fix that.  On the IV-P engine installation, it takes some baffle mods and air guides to get it right.

Colyn

On May 30, 2013, at 11:47 AM, Gary Edwards wrote:

Same here.  Temperatures routinely over 400.  So 380 to 415 is ok to me.

 

Gary

LNC2 320

----- Original Message -----

From: Matt

To: lml@lancaironline.net

Sent: Thursday, May 30, 2013 7:35 AM

Subject: [LML] Re: Lancair 360 CHT during climb

My 360 runs that hot and has 1700 hours on the engine.  I would say it is fine. In the summer it can even get that hot in cruise. Not saying it wouldn't be nice if it ran cooler but again 1700 hours on the engine and she still flies. I live in Southern California so summer is very hot. 

Matt

Sent from my iPhone

On May 30, 2013, at 5:20 AM, steve <n5276j@aol.com> wrote:

380 is OK 415 is not, can you richen to bring down under 400?  I would suggest reducing power to keep it under 400 until you fix the problem, most likely your baffling.  Be sure you are sealed. 

 

 

-----Original Message-----
From: Gilles Canese <gilles.canese@sfr.fr>
To: lml <lml@lancaironline.net>
Sent: Wed, May 29, 2013 5:44 pm
Subject: [LML] Lancair 360 CHT during climb

Hello 
I am a new Lancair 360 owner and I have a question about CHT during climbing At 
full power after take off,  CHT 's are between 380 and 415 oF, is it normal for 
a 360?

Thanks for the answers 

Gilles 


Envoyé de mon iPad
--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html