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Date: Mon, 03 Oct 2011 18:10:36 -0400
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From: Brent Regan <brent@regandesigns.com>
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Peter asks:

<<<<<1 . CHTs are all around 185 with the exeption of no. 3. It is also 
the one where EGT is only 620 wheras all others are at 790. That should 
not be the case and I am surching the reason.

2. Engine cowling is quite close to the exhaust - what is the 
recommended minimum distance?

3. In case I want to isolate the exhaust for heat isolation, is it 
better to isolate the exhaust or to put some isolating material to the 
cowling ?

4. Any recomentations for a pull rod  for the Lancair 360 ? Finally is 
decided that I need one and do not want to reinvent the wheel.>>>>>>

1) Ground runs will not give you an accurate indication of what will 
happen at high power settings. You can try to swap injectors to see if 
the low temperature follows the injector but I suspect these readings 
will become meaningful at higher power settings. Monitor these readings 
carefully during early flight testing.

2) This depends on how much cooling is available. An effective product 
to use is Zetex A600. It is a cloth material that has one face covered 
in thin aluminum. You can make your own by using spray adhesive (3M #90) 
to bond heavy duty cooking aluminum foil to class cloth and then bonding 
that to your cowling. Seal the edges with RTV.

3) Do NOT insulate the exhaust pipe. This causes the pipe to get hot and 
can lead to failure.

4) I can't help you with this one.

I hope this helps. In what country are you building your aircraft?

Regards
Brent Regan