> >Jerry Hey wrote:

 >>
 >>  Is there a significant performance gain with the tuned version?

I

 >>  have got the impression that exhaust pipe length is not so

important

 >>  as unrestricted breathing.    Has anyone built one of these

mufflers?

 >>  Is the simple version just an empty can that the exhaust dumps

into

 >>  from the side?   What type of Stainless?  Is ".040 inconal" a
 >>  complete specification?   Jerry

 >In theory yes Jerry on the tuned version. Not to my knowledge has

any

 >one built one yet. I am not sure it would fit in your cowl as the

diameter

 >is about 10 inches while the engine is about 6 inches from center

line

 >so the width of the cowl in that area would have to be about 32
or more inches
 >wide. Brian Trubee designed a simplified version with square

runners welded

 >up from flat sheet that you might want to try. It is possible to

make it

 >slightly more compact as the runners could be rectangular.
 >
 >Just an empty can. .049 thick 316 stainless ought to be about

right.

 >0.065 thick 316 SS would probably make it bullet proof.
 >Inconel (pure nickel and chrome) is great but expensive.
 >
 >Paul Lamar

Jerry Hey wrote:

 >Paul, it is easy to find 6" O.D. SS tubing remnants in this area.
 >It is used in the vinyards. It is type 304.  The gentleman I talked
 >to thought both 049 and .063, were available,  but he did not want
 >to walk out the the remnant pile to find out.   I don't know how

304

 >stands up to the heat.   Very hard on tools as I recall.   Jerry

304 will work. Not quite as good as 316. There are tricks to
drilling SS. As I recall you need to keep the pressure on and
keep it cutting till it is done. A plasma cutter is no problem
however. Tracy just bought a new one. You might find a sheet metal shop

that does commercial kitchen

Paul Lamar

I have a plasma cutter.  I used to build the turbo exhaust manifolds
for the "TurboSuzuki" (60 cu. in-- 100hp).  I made about 20 of them
before the company went belly up. I'm thinking I will  make up a few 304
simple tangential mufflers to experiment with.   Jerry

That's great Jerry. I am sure some other people need mufflers on here.
Perhaps you would make some for them too. Both tuned and untuned.
OK folks here is your chance. Bug Jerry for mufflers :-)

Paul Lamar

Ian & Irene Beadle wrote:

I'll have one please Jerry. Or just a drawing of one that works will do.
Ian RV6A

Are you saying Ian the drawing on the ACRE NL web site does not work or it is
not a drawing? :-)

Paul Lamar
 
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