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<DIV><FONT face=Arial size=2>Ed - the only conrod wear issues I had with the ST
seemed to be related to running the bigger props and higher nitro. I think
the sheer mass of the larger load puts more wear on the upper part of the
conrod. In my situation, though, I also saw similar wear on the lower
end...If I kept the nitro around 22-25%, 18% oil, and the load slightly less,
things improved.</FONT></DIV>
<DIV><FONT face=Arial size=2> As always, YMMV, and I could be
*completely* wrong.</FONT></DIV>
<DIV><BR>Bob Pastorello, Oklahoma<BR>NSRCA 199, IMAC 1320, AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=edbon85@optonline.net href="mailto:edbon85@optonline.net">Ed
Miller</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> Monday, June 23, 2003 9:41 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> ST2300 conrod, wrist pin
end</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Any of you folks out there that have been running
ST2300's ever experience a short lived wrist pin end of the con rod ?? I have
approximately 100 flights on a ST2300 in a Hanson Dalotel spinning an APC 18x8
with S&W fuels 20% to 30% nitro ( 20% oil in all fuels ) and the bushing
in the wrist pin end of the con rod is worn out. I'd say there is at least
.030" clearance, maybe more. Engine was down about 700rpm on the ground and
never really settled on a rpm and acted lean in the air, in verticals it
went flat, would no longer haul plane vertically indefinately. This all
happened in maybe 5 or 6 flights, went from a powerhouse to a dog. There is
only one small hole in the top of the conrod to lube the wrist pin ( approx
.040" in dia. ), the wrist pin is fine and measures no wear at all where the
conrod rides on it. I'm going to order a new conrod, if the new one only has
one hole in it I may enlarge it a bit as well as add a second hole from the
bottom of the wrist pin boss on the rod. Luckily I have a 2nd ST2300, just
installed it and I'm back to 8800 rpm on 25% nitro with the 18x8 so I'm ready
for the Pocono pattern contest. Both my ST2300's are Italian made, the only
notable difference is one has a longer crankshaft ( prop end ).</FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks...Ed
M.</FONT></DIV></BLOCKQUOTE></BODY></HTML>