Mailing List lml@lancaironline.net Message #70533
From: pete@leapfrogventures.com <pete@leapfrogventures.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: High CHTs on #2, TSIO 550
Date: Sun, 10 Aug 2014 16:56:22 -0400
To: <lml@lancaironline.net>
That is correct. However, the only time you need to close the oil door is when temps are really cold, which means your CHTs are on the cool side as well, so it works just fine in both hot and cold scenarios. 

Pete 

On Aug 9, 2014, at 5:18 AM, Colyn Case <colyncase@earthlink.net> wrote:

Pete, am I correct that that only works if your oil cooler door is open?

On Aug 8, 2014, at 1:24 PM, pete@leapfrogventures.com wrote:

That would be the one.  Far superior to the blister approach IMHO.
 
Pete
 
From: Mark Sletten [mailto:mwsletten@gmail.com] 
Sent: Thursday, August 07, 2014 2:00 PM
Subject: Re: [LML] Re: High CHTs on #2, TSIO 550
 

 

On Thu, Aug 7, 2014 at 3:17 PM, pete@leapfrogventures.com <pete@leapfrogventures.com> wrote:
You need to install a scoop inside the oil cooler to get the air around and on the bottom back side of #2.  If you look closely, you will notice that the depth of the gap between fins at the horizontal sides of each cylinder is not symmetric.  It has depth between them on one side of the cylinder, but not on the other.  On #2, the zero depth side is up against the oil cooler, so no air gets around to the bottom.  I tried the blister idea some have used, but found the scoop to be far superior.  #2 is no longer my hottest, even on climbout - all cylinders are now within 20 degrees of each other.  I posted photos of it a few years ago, but can't seem to find my original.

Pete


-----Original Message-----
From: Thomas Whalen [mailto:thomasjwhalen@att.net]
Sent: Wednesday, August 06, 2014 1:20 PM
Subject: High CHTs on #2, TSIO 550

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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