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<DIV>A long pipe flattens the torque curve and that is what we want. We
want more torque at lower rpm. If you were racing and had a constant load
you would tune for maximum rpm, but in aerobatics when you pull vertical
the engine slows down. It won't slow as much if you have increased the
torque at the lower rpm. Make sense?</DIV>
<DIV>Back in the 70s Pete Callas figured this out and while many guys had more
rpm on the ground, their engines didn't pull like Pete's. Chip picked up
on this and probably got more credit than Pete for going to the long pipe.</DIV>
<DIV>Jim</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jghughes@insightbb.com
href="mailto:jghughes@insightbb.com">jghughes</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 01, 2004 6:14
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Mintor Review</DIV>
<DIV><BR></DIV>
<DIV>I normally agree with you guys on 2 stroke tuning, but as we lengthen the
pipe to get a smoother transition, what is really happening is you are
bringing the "resonance" rpm down and giving up top end power. If you go to Ed
Hartley's two stroke page, You will see that there is not a lot of difference
in rpm between the muffled OS1.40's and the tuned pipe ones. I agree that if
you have an engine ported for a pipe and all's you care about is top end, a
pipe makes a huge difference. But we care more about throttleability on these
engines, so the HP is down. I'll loan one of you guys my 590 and you can
test back to back if you want.</DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean
Pappas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 01, 2004 12:41
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Mintor Review</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=772544020-01042004>Karl's right.</SPAN></DIV>
<DIV><SPAN class=772544020-01042004> Dean</SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B> Karl G. Mueller
[mailto:kgamueller@rogers.com]<BR><B>Sent:</B> Thursday, April 01, 2004
3:37 PM<BR><B>To:</B> <A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR><B>Subject:</B>
Re: Mintor Review<BR><BR></FONT></DIV>
<DIV>Steve,</DIV>
<DIV> </DIV>
<DIV>With proper exhaust port timing and setup with a good pipe you
will</DIV>
<DIV>loose that bet. My bet is that you will gain closer to 20%
improvement</DIV>
<DIV>in power, of course with more power comes a higher fuel
consumption</DIV>
<DIV>as well. Most engines are very conservatively ported in the
exhaust</DIV>
<DIV>timing to run on a muffler as well as on a pipe. Just an
other compromise</DIV>
<DIV>by the manufacturers.</DIV>
<DIV> </DIV>
<DIV>Karl G. Mueller<BR><A
href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</A><BR>
</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Patternrules@aol.com
href="mailto:Patternrules@aol.com">Patternrules@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, April 01, 2004 9:49
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Mintor Review</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>In a message dated 4/1/2004 9:28:50 AM US Eastern Standard Time, <A
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
face=Arial>Mintor 140 article, how does it run on a muffler
as<BR>opposed to a pipe. I would expect some loss in power<BR>but also
a loss in cost.</FONT></BLOCKQUOTE></DIV>
<DIV><STRONG> I don't use pipes on any on mine engines Jeff Hughes
and I have been using the Bolly 590r which is a muffler, no tuning head
aches, no midrange problems, if you change props, fuel or anything else
NON PROBLEMS, I have been running the Mintor 140 with it and it runs
super, don't know how much less power you get from just running a
muffler but I'd bet it's not over 5%, I use Coolpower 15%
fuel.</STRONG></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT lang=0 face="Arial Baltic" FAMILY="SANSSERIF"
PTSIZE="10"><B><I>Steve
Maxwell</B></I></FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>