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Date: Mon, 19 Oct 2009 15:38:38 -0400
Message-ID: <1ab24f410910191238i30c45f94q4ae7f6a299ddb070@mail.gmail.com>
Subject: External Muffler
From: Lynn Hanover <lehanover@gmail.com>
To: flyrotary@lancaironline.net
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Lynn,
   This gives me a lot info for the proposed external exhaust/muffler system
for my "Dyke Delta"
and for any other of the Rotary group needing such a system............One
question......You show
the straight run noted "As long as possible"...........Will there be a down
side if the total primary
header length is longer than 22-24 inches ?..........I have more space under
the "Delta" cowl than
average and may be able to add more primary length before the
collector.........What would be
the next primary length that "Tunes" ??..............Really appreciate your
knowledge and the effort
you go to helping myself and the group out...............

Thanks Again,
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold

Our engine builder said that 2 exhaust pulses before the collector was
abouit it for tuning. Racing Beat says 22" to 24" for Nonported or street
ported engines. That is the short system length to the collector.

The long system would be 120" to 125". That would have the muffler under the
rear bumper. The primary length is designed to pump up the dismal torque at
the lower end of the power band. So think about 7,000RPM to 7,500RPM. So
airplanes (assuming 5,000RPM to 6,500RPM cruise) would do fine with about
30" to 36" which is about the length of a street header. And 36" was what I
used on the piston 4 cylinder engines I raced. The major interest is the
equal length primaries and long collector. I wasted a year of tuning with a
header that had one tube longer than the other. When I redid that to get
equal lengths the engine came alive.

The intake tuned length would more likely have a bigger effect on torque
peak And best power. So, I would put the most efffort into the intake
lengths.

Lynn E. Hanover

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<div>Lynn,</div>
<div>=A0=A0 This gives me a lot info for=A0the proposed external exhaust/mu=
ffler system for my &quot;Dyke Delta&quot; </div>
<div>and for any other of the Rotary group needing such a system...........=
.One question......You show</div>
<div>the straight run noted &quot;As long as possible&quot;...........Will =
there be a down side if the total primary</div>
<div>header length is longer than 22-24 inches ?..........I have more space=
 under the &quot;Delta&quot; cowl than</div>
<div>average and may be able to add more primary length before the collecto=
r.........What would be </div>
<div>the next primary length that &quot;Tunes&quot; ??..............Really =
appreciate your knowledge and the effort</div>
<div>you go to helping myself and the group out...............</div>
<div>=A0</div>
<div>Thanks Again,</div>
<div id=3D"signature" class=3D"signature">--<br>Kelly Troyer <br>&quot;Dyke=
 Delta&quot;_13B ROTARY Engine <br>&quot;RWS&quot;_RD1C/EC2/EM2 <br>&quot;M=
istral&quot;_Backplate/Oil Manifold </div>
<div class=3D"signature">=A0</div>
<div class=3D"signature">Our engine builder said that 2 exhaust pulses befo=
re the collector was abouit it for tuning. Racing Beat says 22&quot; to 24&=
quot; for Nonported or street ported engines. That is the short system leng=
th to the collector.</div>

<div class=3D"signature">=A0</div>
<div class=3D"signature">The long system would be 120&quot; to 125&quot;. T=
hat would have the muffler under the rear bumper. The primary length is des=
igned to pump up the dismal torque at the lower end of the power band. So t=
hink about 7,000RPM to 7,500RPM. So airplanes (assuming 5,000RPM to 6,500RP=
M=A0cruise) would do fine with about 30&quot; to 36&quot; which is about th=
e length of a street header. And 36&quot; was what I used on the piston 4 c=
ylinder engines I raced. The major interest is the equal length primaries a=
nd long collector. I wasted a year of tuning with a header that had one tub=
e longer than the other. When I redid that to get equal lengths the engine =
came alive.=A0=A0</div>

<div class=3D"signature">=A0</div>
<div class=3D"signature">The intake tuned length=A0would more likely have a=
 bigger effect on torque peak And best power. So, I would put the most efff=
ort into the intake lengths. </div>
<div class=3D"signature">=A0</div>
<div class=3D"signature">Lynn E. Hanover</div>

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