Mailing List lml@lancaironline.net Message #70510
From: Bob Rickard <r.rickard@rcginc-us.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] High CHTs on #2, TSIO 550
Date: Thu, 07 Aug 2014 16:18:05 -0400
To: <lml@lancaironline.net>
I agree with Colyn,

I climb at 145 even in the summer and CHT’s stay below 380 - without exhaust tunnel extensions.  I find that fuel flow at WOT set at 45-47gph helps a lot.

Bob R




On Aug 7, 2014, at 8:21 AM, Colyn Case <colyncase@earthlink.net> wrote:

140 is Vy.   It can work fine (CHT 380 or less) if your engine, baffles, fuel flow etc. are set up correctly, and you have the exhaust tunnel extensions. 11 minutes to FL200 @43gph will use 7.8 gallons of fuel.

On Aug 7, 2014, at 7:28 AM, John B wrote:

I think 140 on the climb is very slow, Tom. I suggest you set your climb speed at 165. That should still allow 1500 to 1800 fpm vertical at least to about FL 180.  The bonus is that CHT should be a lot cooler.

John

Sent from my iPad


On Aug 6, 2014, at 1:19 PM, Thomas Whalen <thomasjwhalen@att.net> wrote:

I have been fighting for over a year to try to keep the #2 CHT below 400 dg on the climb. It has hit as high as 430. I leave it full rich and climb at 140kts. When I level off, I then LOP and then #1 cools off. I have the Lancair baffles and RTV the gaps with the engine and have a good baffle seal. I even covered my 3rd intercooler and that only helped a little. Behind the prop the baffle seals up to the top cowl but not down to the bottom. I have seen it the reverse of that as well. If close the oil cooler door the CHT will drop 5dg at times.
This was a factory new engine.
Any suggestions?

Thomas Whalen
N444TW
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