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zevenenergie wrote on 04/09/20 at 04:46:26:LANCER wrote on 04/03/20 at 11:20:34:The length of the stock header is good.
That low sounding thump is what I like too, as well as the deep sounding O-W-H-H-H-H on a high speed & rpm deceleration. For me, that is achieved with a good reverse cone with proper baffling around a central straight through core. 18-20” long
That’s just me.
I have heard that when you have a cone on the end of the pipe that works like a pipe of various lengths, is that what you mean?
Would you like to make a sketch of what you mean?
A sketch ?
You want me to make a sketch on an electronic device ?
It seems I did try it a few times and that was a few years ago.
So, until I can get my wife to do a little tutoring for me I will try this.
My muffler is an old R&D unit from Cone Engineering years ago, maybe 15 yrs. it is the inside functional portion of a large ballgna shaped chrome HD type. I cut of the chrome shell and that inside functional section is what I use.
I will need to go back later with photo & sketch if my wife is successful with my training.
It is all stainless, 20” L, 1.75”-3.0” OD
The first 3 inches are 1.75”OD, then 7” widening to 3”OD, and then 3”OD for another 10”.
It has a straight through core of 1.5-1.6”, and around that core is a set of spirals. When I spoke with guy I purchased it from (that had the test assignment from Cone Engineering) he said the engineers told him of the construction design. It was designed to push exhaust through the entire can are low-mid rpm and produce a very nice rumble and aid Torque. As rpm rises something about the shape inside causes the higher speed air to exit mostly through the central core, making a nice wail and my engine likes it.
It is a forgiving muffler regarding carb tuning and responds 99.9% of the time by never backfiring on me. It sounds GOOD. 😎.
On the rare occasion I’ve had a backfire it’s been due to an upstream air leak.
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Will work on the sketch or photos.