Jeff asked;

 

From: "Jeff Gregory" <jeffgregory@bellsouth.net> Sender: <marv@lancaironline.net> Subject: Lancair 4p overheating Date: Fri, 14 Jul 2006 13:32:50 -0400 To: lml

We have been having problems with our cht.  Last saturday we were cruising at 11000' and at 28" and 2500rpm our cht was rising to almost 400 degrees.  It seems like we all of a sudden started having high cht for no reason. Have you noticed this with any other 4p's. Jeff

 

Jeff, I have had a similar experience. I have over 400 hrs on my 4P and one time I was flying for over 1.5 hrs level at altitude running LOP and within about 1 min. I had number 3 CHT just start marching up to 420* where I had my alarm set. I went full rich for a while until all temps were back to my normal high and then continue back to LOP. I never saw that situation again.

 

For the record, I now only run ROP because of too high EGT's when LOP and I have replaced two complete sets of cylinders in my 400 hrs all with exhaust valve stems and guides warn beyond service limits.

Jim