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<DIV><FONT color=#000000 size=2>Lance Vanodstrand and I did some testing on his
airplane with the O.S. and grieve pipe. He had the length too long and
couldnt seem to get enough power. The pipe was way too long. We
shortend the pipe and he got much better results. Try shortening it a
little at a time till you reach a peak rpm and if the rpm drop after shortening
it then back it off about 1/4-3/8". You should be able to turn
a 17x12n APC about 8400rpm on 15% fuel O.S. "F" plug. You could
have other issues but this is what we found on the tuning part. </FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT size=2>Wayne</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
<DIV><FONT face=Arial size=2><B>-----Original Message-----</B><BR><B>From:
</B>GW <<A href="mailto:gw@gwair.com">gw@gwair.com</A>><BR><B>To:
</B><A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> <<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>><BR><B>Date:
</B>Saturday, April 26, 2003 11:04 AM<BR><B>Subject: </B>OS 140 and Greve
pipe question<BR><BR></DIV></FONT>
<DIV><FONT face=Arial size=2>Can someone let me know the proper setup
lengths for this engine and pipe combo? OS 140 /Greve pipe.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have tried many different lengths on the
pipe, and many different setting on the needles, and I still have a very
rich midrange that the engine cannot overcome. The engine will reach max RPM
if I go from idle to full throttle in a quick transition, but with a slow
advance of the throttle from low to high, it stumbles,spits and sputters
from mid throttle on and often just quits after a few moments of
stumbling.and never reaches max rpm.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have run the pressure adjust on the pump out
up to 1 1/2 turns to reduce pressure, with little or no change.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am about to install a 3M head with dual plugs
to see if it will help.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As a side note, I have a CD products Muffler
(very restrictive but quiet) and the engine runs flawlessly on this setup,
Transition is perfect, but this setup will not fit in my new CA Models
Eclipse, so the Greve needs to work!</FONT></DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Any advise?</FONT></DIV>
<DIV> </DIV></FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
<DIV><FONT face=Arial size=2>GW</FONT></DIV>
<DIV><FONT face=Arial size=2>Gerald</FONT></DIV>
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