<br><font size=2 face="sans-serif">Tim</font>
<br>
<br><font size=2 face="sans-serif">Are you sure that the pump is functioning?
The backfire is a sign of lean mid and will damage the CF pipe baffles.
During the hot summer, the pump can get very hot. Do you have the pump
insulator modification on your engine? Mintor designed this at Lance's
request, as the Texans discovered this problem flying in 100F+ temps that
exceed European climates.</font>
<br><font size=2 face="sans-serif"><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radome and Composites Engineering<br>
Raytheon</font>
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<td width=40%><font size=1 face="sans-serif"><b>"Pascoe,Tim [Burlington]"
<Tim.Pascoe@ec.gc.ca></b> </font>
<br><font size=1 face="sans-serif">Sent by: nsrca-discussion-bounces@lists.nsrca.org</font>
<p><font size=1 face="sans-serif">08/03/2006 09:01 AM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
NSRCA Mailing List <nsrca-discussion@lists.nsrca.org></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif"><nsrca-discussion@lists.nsrca.org></font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">[NSRCA-discussion] Mintor 1.70 Question</font></table>
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<br><font size=2 face="Arial">Hey List,</font>
<p><font size=3> </font><font size=2 face="Arial">I’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’ve found myself trying
to get the pump/needles back to where they should be, with varying levels
of success.</font>
<p><font size=3> </font><font size=2 face="Arial">The</font><font size=3>
</font><font size=2 face="Arial">original 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’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’m really afraid that I’m going to start busting
stuff.</font><font size=3> </font><font size=2 face="Arial">I am now well
in on the pump screw, much further than another Mintor 1.70</font><font size=3>
</font><font size=2 face="Arial">flier</font><font size=3> </font><font size=2 face="Arial">running
the same fuel, and a long way past flush with the screw housing. The mid-range
needle is also on the rich side of the setting.</font>
<p><font size=3> </font><font size=2 face="Arial">Any
suggestions would be appreciated.</font><font size=3> </font><font size=2 face="Arial">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’m chasing the problem
the wrong way?</font>
<p><font size=3> </font><font size=2 face="Arial">It’s
getting frustrating, as the engine is great in</font><font size=3> </font><font size=2 face="Arial">many</font><font size=3>
</font><font size=2 face="Arial">other ways</font><font size=3> </font><font size=2 face="Arial">–
very easy to start, phenomenal power, good</font><font size=3> </font><font size=2 face="Arial">throttle
response.</font><font size=3> </font><font size=2 face="Arial">I’m running
a 17x13 prop (soon to switch to the new 18.1x10) on an Aeroslave carbon
pipe set approx</font><font size=3> </font><font size=2 face="Arial">¼</font><font size=3>
</font><font size=2 face="Arial">to</font><font size=3> </font><font size=2 face="Arial">½
inch longer than the Aeroslave recommended length,</font><font size=3>
</font><font size=2 face="Arial">with Cool Power 15% for fuel.</font>
<p><font size=2 face="Arial">Tim Pascoe</font><font size=2><tt>_______________________________________________<br>
NSRCA-discussion mailing list<br>
NSRCA-discussion@lists.nsrca.org<br>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</tt></font>
<p>