Yes the oval steel inserts are common to all engines.
Unfortunately for you, you don't have the rectangular splitters. Expect to shred your muffler in short order :)

Since Tracy don't have these either and he's using 0.035 header elbows, they should hold up and so my recommendation of shaping your elbows to fit in the ovals (protruding past the flanges) still holds.

I don't see any advantage of letting the exhaust expand to the full 2" size of the steel inserts and then narrow down again to 1.75" via a cone when you can just jam the 1.75" pipe into the steel inserts until it's smooth with the insert circumference (which is oval at that point).

Others may have different opinions... :)

Finn

john wrote:

Ed and Finn;  The engine that I have, I purchased from Atkins Aviation and I
don't know much else about it.  Looking in the Haynes Manual there is a
picture of some rectanglar metal pieces in the exhaust ports.  Are these
inserts used in the turbo engines, at any rate the engine I have doesn't
have those .  There appears to be some nearly round inserts in the aluminum
rotor housing, I assume these may be peculiar to all 13B engines.  Thankyou
for the info.  Next week i'll have to do some price checking with some
different vendors and go from there.  JohnD


  

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