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<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>Hello
Tim,</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>Let me see if I can
offer a couple of experiments.</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>1) Can you fatten
the idle mixture? That will help.</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>2) Your pipe is
long, and long pipes lean the midrange, while short pipes fatten the
midrange.</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>3) If you
disassembled and re-assembled the engine, even a tiny bit of overtightening of
the four screws holding the cylinder to the case will cause piston skirt
and bottom end heating which will do ugly things to the base compression
after warmup. This will cause leaning in both suction-fed and pumped engines. I
forget the torque spec, but it was in the Mintor 140 review article in MA
several years ago.</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial size=2>Hope that
helps,</FONT></SPAN></DIV>
<DIV><SPAN class=071031314-03082006><FONT face=Arial color=#0000ff size=2><FONT
color=#000000>
Dean</FONT> </FONT></SPAN></DIV>
<DIV><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of
</B>Pascoe,Tim [Burlington]<BR><B>Sent:</B> Thursday, August 03, 2006 10:02
AM<BR><B>To:</B> nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B>
[NSRCA-discussion] Mintor 1.70 Question<BR><BR></FONT></DIV><!-- Converted from text/rtf format -->
<P align=left><SPAN lang=en-us><FONT face=Arial size=2>Hey
List,</FONT></SPAN></P>
<P align=left><SPAN lang=en-us>
<FONT face=Arial size=2>I</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2>’</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2>ve been setting up
a Mintor 1.70 in a new plane, and am running into some minor difficulties. I
first started running the engine last fall, and has some mechanical trouble
which lead to some major needle twisting. After getting the mechanical trouble
out of the way, I</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2>ve found myself trying to get the
pump/needles back to where they should be, with varying levels of
success.</FONT></SPAN></P>
<P align=left><SPAN lang=en-us>
<FONT face=Arial size=2>The</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us> <FONT face=Arial size=2>original</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2> symptoms seemed to
indicate a lean mid-range on the engine; dying on throttle up after a down
line, the odd backfire when spooling up from idle in the flat.
I</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>ve been constantly richening the pump in an attempt to solve
these issues, and it seemed to work at first. Better mid-range, no dead
sticks. However, I am still getting the odd backfire, and I</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>m really afraid that I</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>m going to start busting stuff.</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2></FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Arial size=2>I am now well in
on the pump screw, much further than another Mintor 1.70</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Arial
size=2>flier</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT
face=Arial size=2>running the same fuel, and a long way past flush with the
screw housing.</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2> The mid-range needle is also on the rich side of the
setting.</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P align=left><SPAN lang=en-us>
<FONT face=Arial size=2>Any suggestions would be
appreciated.</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT
face=Arial size=2>The lines have all been checked, and they are fine (pretty
much new anyway). The tank clunk is free, and the vent line is clear. Is it
possible the backfire issue is in fact a too rich mixture, and
I</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>m chasing the problem the wrong way?</FONT></SPAN></P>
<P align=left><SPAN
lang=en-us> </SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Arial
size=2>It</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>’</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2>s getting frustrating, as the engine is
great in</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT
face=Arial size=2>many</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us>
<FONT face=Arial size=2>other ways</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us> <FONT face=Arial size=2>–</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2> very easy to
start, phenomenal power, good</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us> <FONT face=Arial size=2>throttle</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2>
response.</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT
face=Arial size=2>I</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2>’</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial size=2>m running a 17x13
prop (s</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>o</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2>on to switch to the new 18.1x10) on an Aeroslave carbon pipe
set approx</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us> <FONT
face=Arial size=2>¼</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2></FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us> <FONT face=Arial size=2>to</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us> <FONT face=Arial
size=2>½</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2> inch longer than the Aeroslave recommended
length</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>,</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us><FONT
face=Arial size=2></FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us>
<FONT face=Arial size=2>with</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us><FONT face=Arial size=2> Cool Power 15% for fuel</FONT></SPAN><SPAN
lang=en-us></SPAN><SPAN lang=en-us><FONT face=Arial
size=2>.</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN></P>
<P align=left><SPAN lang=en-us><FONT face=Arial size=2>Tim
Pascoe</FONT></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us></SPAN></P></BLOCKQUOTE></BODY></HTML>