<< > > > > > I tried the Edelbrock RPM series on my plane.  It lasted

about

20 hours
 > > > > > before self destructing.  Packing (ceramic) blew out in about

5

hours. I
 > > > > > sent pictures of it to the list some time ago.
 > > > > > Tracy Crook

 > > > How about Inconel-718 turnings off a lathe? They are a bit stiff

and

can cut skin
 > > > to the bone instantly but if packed into a casing should work.
 > > >
 > > > Blake

 Don, not to worry.
 Just go up a bit on the muffler wall thickness made from stainless

steel.

 Ed Anderson's SS pipes are quite thick and they don't even discolor.
 They show signs of lasting forever. As I recall they are .065 thick.
 I forgot for sure Ed. How thick are they?

 Tracy's original .035 thick SS  muffler under the cowl lasted
 600 hours. Tracy's original muffler is on the left and what was
 left of his Eldebrock muffler on the right.

 I would guess that a .050 thick SS muffler should last ten years.

 Paul Lamar

Ed Anderson wrote:

Hi Paul,
    My header pipes are Schedule 40 Stainless Steel for 2" OD pipe.  I think
that makes the wall around 0.154 " thick.    But, they show no signs of
deterioration as of yet that is with 180 Hours of engine time on them.  Its
undoubtedly overkill, but I have hear a few stories about the damage pin
holes in RX-7 header pipes caused and did not want same to happen under my
cowling.  I use 0.032 for my muffler except for the "squish tails" which are
made of 0.065" but since my muffler pipe begins 25" from my exhaust port,
the exhaust temp has coolded down a bit before the muffler sees it.
Mufflers have 25 hours on them.

Ed Anderson

 
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