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Date: Sun, 17 Aug 2014 08:25:22 -0400
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From: John B <2thman1@gmail.com>
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Subject: TSIO 550 exhaust stacks

Hello Lancairians,

I was recently shown soot marks on my exhaust stacks by a former Continental=
 employee.  He said those are defined by the angle of the exit gases directi=
on on climb out.  He advised to cut the stacks back to the line defined by t=
hese marks.  Doing so, he said would result in more efficient performance an=
d cooler CHTs. =20

I may or may not have remembered the benefits or rationale correctly.

I set out to do this today and marked the stacks with masking tape and it lo=
oks like the resulting trim will position the face of the stack exit about 2=
0 to 30 degrees different from existing.

I am wondering if others are aware of this, understand the concept, have don=
e this, or have opinions/data about it. =20

I have no reason to distrust the advice given and I believe the individual w=
ho gave the recommendation is extremely knowledgable.  I would just like to k=
now if there is a body of knowledge and experience among our group.

Thanks,

John Barrett
N31VP - about 80% or more finished with body work in prep for paint.=20

Sent from my iPad