I’ve heard, on two different occasions from Continental, that the minimum desired CHT was 320 dF. I was told that cylinders and pistons are manufactured out-of-round to compensate for unequal heating around the cylinder circumference, but are designed to be in-round in the normal operational temperature range.
It was the Continental guy that was at the Branson fly-in that told me this, but I don’t remember his name. Maybe Walter will see this and comment.
Jay Phillips
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn Case
Sent: Wednesday, October 23, 2013 5:21 AM
To: Lancair Mailing List
Subject: [LML] Re: GAMIjector installation on TSIO 550
Neal did mention a number at Greenville but I don't remember what it was. I'm guessing low 300's.
The reason being all the tolerances were set assuming a certain temperature. When it's colder they change.
On Oct 23, 2013, at 7:45 AM, Dico Reijers wrote:
I just got back from the Advanced Pilot course and I asked about the delta between high and low CHT temps and was told that a big spread (mine is about 90F between hot and cold) isn't a big deal and the engine will run fine. However, it is a baffling issue and thats how you can solve the issue if you want to keep the temps closer together. Continental apparantly doesn't publish a minimum CHT temp (unlike Lycoming) but they suggested that they would want to keep them at 235F or higher.
-dr