From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Tue, 21 Jan 2020 15:03:37 -0500
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Subject: Re: [FlyRotary] mufflers
To: "Jeff Whaley jwhaley@datacast.com" <flyrotary@lancaironline.net>
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Only 28%. Geesh, I just drilled mine and did about 200%, I guess that is wa=
y 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 o=
f holes to test different back pressure.=C2=A0Neil, can you confirm 28%? =
=C2=A0

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

In RX8, they (car forum) say 2.75" is the best (but hard to find) exhaust s=
ize. But since we are taking large harsh pulses and bring them down to a sm=
all 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@lancairo=
nline.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

--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.ht=
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<body><div id=3D"__MailbirdStyleContent" style=3D"font-size: 10pt;font-fami=
ly: Arial;color: #000000">
                                        Only 28%. Geesh, I just drilled min=
e 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 pres=
sure.&nbsp;<span style=3D"font-size: 13.3333px">Neil, can you confirm 28%? =
&nbsp;</span><br><br>Is the big can stuffed full of wool, so the primary tu=
bes fire right into it? How does it exit out that bottom pipe?<br><br>In RX=
8, 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 c=
onstant 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"<br><br><br><div><br>=
</div><div class=3D"mb_sig">- Matt Boiteau</div><blockquote class=3D"histor=
y_container" type=3D"cite" style=3D"border-left-style:solid;border-width:1p=
x; margin-top:20px; margin-left:0px;padding-left:10px;">
                        <p style=3D"color: #AAAAAA; margin-top: 10px;">On 2=
020-01-20 8:24:41 PM, Neil Unger 12348ung@gmail.com &lt;flyrotary@lancairon=
line.net&gt; wrote:</p><div style=3D"font-family:Arial,Helvetica,sans-serif=
">Second time with 1 photo each to get past the editor!!=0D<br>=0D<br>Photo=
 of modified straight through muffler to attach directly to the RX8 =0D<br>=
engine.=C2=A0 The science apparently is to have approx 1/8" holes that amou=
nt =0D<br>to 28% of the area of the through pipe.=C2=A0 This one is 3 inch =
but the =0D<br>Manufacturer claims that=C2=A0 2.5" is better. Dia is 5 " an=
d the space =0D<br>between is packed with fine S/S "wool". THis is the firs=
t bloke that can =0D<br>tell me the science in mufflers as he has made them=
 all his working life.=0D<br>=0D<br>JUst passing this on as I am totally ig=
norant as usual.=C2=A0 Still trying to =0D<br>mount my turbo if I live long=
 enough.=0D<br>=0D<br>More photos to follw for those interested.=C2=A0 Neil=
=0D<br>=0D<br>--=0D<br>Homepage:  http://www.flyrotary.com/=0D<br>Archive a=
nd UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html=0D<b=
r></div></blockquote>
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