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<DIV><FONT face=Arial size=2>Ed,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have over 400 flights on my ST2300, still has
original bearings and ring. I run a 17x10N on 15% Ritches 15cc Macs
Quitepipe and it spun 8400rpm. I think the high nitro seems to be
the killer in these engines as most people I speak to have fewer problems with
the lower nitro content.</FONT></DIV>
<DIV><FONT face=Arial size=2>I also ran an ST in a Cap I had but with a
18x8 Simitar prop spinning 8200rpm on 15% Ritches brew and a Bisson
muffler.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Good luck... lower the nitro... live
longer.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne G.</FONT></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=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>