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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dug up some old notes…..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Engine Exhaust
Intake <o:p></o:p></span></font></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=234
style='width:175.4pt;border-collapse:collapse'>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OS140RX<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>154<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>124<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>KB150<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>147<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>107<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ST2300<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>150<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>116<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Bully145<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>150<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>106<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Webra160<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>142<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>107<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Mintor140<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>140<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>120<o:p></o:p></span></font></p>
</td>
</tr>
<tr height=17 style='height:12.75pt'>
<td width=76 nowrap height=17 valign=bottom style='width:56.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt'>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Mintor170<o:p></o:p></span></font></p>
</td>
<td width=93 nowrap height=17 valign=bottom style='width:69.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>150<o:p></o:p></span></font></p>
</td>
<td width=65 nowrap height=17 valign=bottom style='width:48.8pt;padding:0in 5.4pt 0in 5.4pt;
height:12.75pt' x:num>
<p class=MsoNormal align=right style='text-align:right'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>110<o:p></o:p></span></font></p>
</td>
</tr>
</table>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If anyone has access to volumes of engine
data generated by Clarence Lee, crankcase timing for many of the above engines
could probably be found.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In general –<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- high exhaust port timing increase power
and raises RPM of peak torque.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- high exhaust timing allows bigger power
increases from a pipe.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- longer overlap allows more effect from the
pipe (power, pipe jump, midrange mixture, etc).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- given constant RPM and no other changes
(compression, glow plug, etc), lowering the exhaust timing will “want”
the pipe shortened.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- lengthening the pipe (within a range)
will increase torque, and lean the midrange mixture.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And there is so much more to get the “perfect”
tune on a 2C.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Most pattern timed engines will have a “window”
(blowdown?) in which exhaust, intake, and crankcase ports are all open – during
that window, the pipe can be very powerful as a negative pressure pulse from the
pipe will not only scavenge exhaust gases from the combustion chamber, but pull
fresh fuel/air mixture the length of the intake path. I never documented blowdown,
but I think it was typically around 10 degrees.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><br>
Dave Lockhart<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>John Pavlick<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, November 06, 2008
9:06 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">General
pattern discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Engine tuning info</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Karl,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Thanks for the info. I never put a degree wheel on a
model engine so this is interesting to say the least. I'm surprised that model
4-strokes have no overlap. Hmm. You'd think that something like the YS 170
could benefit from that. I don't have as much tuning experience with 2-strokes
as I do with 4-strokes (motorcycles). I'd like to do some experiments with
model engines now...</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>John Pavlick<br>
<a href="http://www.idseng.com">http://www.idseng.com</a></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:kgamueller@rogers.com" title="kgamueller@rogers.com">Karl G.
Mueller</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jpavlick@idseng.com" title="jpavlick@idseng.com">jpavlick@idseng.com</a>
; <a href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">General pattern discussion</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Thursday, November
06, 2008 7:19 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re:
[NSRCA-discussion] Engine tuning info<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>John,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Most of the 2C sport engines to be used with a muffler are
timed</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>at about 145-148º exhaust down time.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>On most of the .60 to 1.60 size, to get the benefit of the
supercharging</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>effect from the pipe, I increase the exhaust downtime to
155-158º, without</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>changing the intake timing, except for some directional
porting for better </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>scavenging effect. This all will not decrease a reliable
idle.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I believe that the pylon engines are ported to 170º exhaust
down time and </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>on those you are not looking for a reliable low idle. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Never tried any work on 4 strokes. To get any benefit from a
pipe on those</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>you would have to have overlapping valve timing, which none
of our model</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>4 stroke engines have.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Karl G. Mueller<br>
<a href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</a></span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
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<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jpavlick@idseng.com" title="jpavlick@idseng.com">John Pavlick</a> <o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a> <o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Thursday, November
06, 2008 5:02 PM<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> [NSRCA-discussion]
Engine tuning info<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Has anyone taken the time to measure the port
timing of various model airplane 2C engines? Specifically the OS140 and
160? Also, if anyone has cam profiles + index info for the YS 160
and 170 4C motors I'd be interested in that as well.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>John Pavlick<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>_______________________________________________<br>
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