Mailing List flyrotary@lancaironline.net Message #65532
From: Matt Boiteau mattboiteau@gmail.com <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] mufflers
Date: Tue, 21 Jan 2020 15:03:37 -0500
To: Jeff Whaley jwhaley@datacast.com <flyrotary@lancaironline.net>
Only 28%. Geesh, I just drilled mine and did about 200%, I guess that is way to much. I guessed the drill area to be double the size of the pipe. Did make design so I can drill out one cap and switch out the inner pipe full of holes to test different back pressure. Neil, can you confirm 28%?  

Is the big can stuffed full of wool, so the primary tubes fire right into it? How does it exit out that bottom pipe?

In RX8, they (car forum) say 2.75" is the best (but hard to find) exhaust size. But since we are taking large harsh pulses and bring them down to a small constant flow, they say you can run smaller size. I did my downpipe as 2.75" and will do the long exhaust underneath plane in 2.5"



- Matt Boiteau

On 2020-01-20 8:24:41 PM, Neil Unger 12348ung@gmail.com <flyrotary@lancaironline.net> wrote:

Second time with 1 photo each to get past the editor!!

Photo of modified straight through muffler to attach directly to the RX8
engine.  The science apparently is to have approx 1/8" holes that amount
to 28% of the area of the through pipe.  This one is 3 inch but the
Manufacturer claims that  2.5" is better. Dia is 5 " and the space
between is packed with fine S/S "wool". THis is the first bloke that can
tell me the science in mufflers as he has made them all his working life.

JUst passing this on as I am totally ignorant as usual.  Still trying to
mount my turbo if I live long enough.

More photos to follw for those interested.  Neil

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