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<DIV><SPAN class=791420418-15022005>Emory,</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>Lengthen the pipe. It widens the sweet-spot,
at the expense of all-out power in level flight.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>If the sweet-spot is very narrow, you may
even be too short for best power in the vertical.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>Actually, there is a best length for
horsepower after a two or three seconds of warmup in the vertical
climb,</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>and just a quarter or so of inch longer will
produce better grunt for the first two seconds of climb.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>That's the length I usually
prefer.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>Also try this test: fly at wide open
throttle for a good four or five Mississippi count.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>If the engine does not go just a
<EM>little</EM> bit rich, lengthen the pipe a quarter inch.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>If the engine goes solidly rich, then that's
too long.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>Alternatively ...</SPAN></DIV>
<DIV><SPAN class=791420418-15022005>Sometimes a hotter plug allows you to run
richer.</SPAN></DIV>
<DIV><SPAN class=791420418-15022005></SPAN> </DIV>
<DIV><SPAN class=791420418-15022005>Hope this helps,</SPAN></DIV>
<DIV> </DIV>
<P><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> </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On Behalf
Of </B>Emory Schroeter<BR><B>Sent:</B> Tuesday, February 15, 2005 12:54
PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> Re: Webra 160
Problem<BR><BR></FONT></DIV>
<DIV>OK Matt and others,</DIV>
<DIV> </DIV>
<DIV>I have a question also. I have two Webra 1.60's with the MC carbs that do
run well. The only thing I don't like is that the adjustment seems real
critical (there is a small window from lean to rich). How can I adjust the
engine or pipe to make that window larger so that I am not so close to being
too lean? Do I need to change the pipe length or increase the pump pressure?
Here is the set-up that I am running...</DIV>
<DIV> </DIV>
<DIV>20% Cool Power fuel</DIV>
<DIV>Greve pipe set at 31 to 31.5 inches (measured from glow plug to rear
of pipe where the stinger starts)</DIV>
<DIV> </DIV>
<DIV>What do you all think?</DIV>
<DIV> </DIV>
<DIV>Thanks, Emory Schroeter</DIV>
<BLOCKQUOTE dir=ltr
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=Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</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> Tuesday, February 15, 2005 11:30
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Webra 160 Problem</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000>
<DIV>Hey folks, thought I'd pass on a problem I experienced with my new 160
this past weekend and share the apparent solution.</DIV>
<DIV> </DIV>
<DIV>Extremely strong engine, easy starting just like its small brother.
However, it did something very annoying this past weekend. Rich running on
theground and for the first couple passes around the field. But after about
a minute of running, the moment I would point the nose up at partial
throttle, the engine would sag to lean, and then catch and run fine again.
It did this continuously at partial throttle but not at full throttle. Oil
on the exhaust stinger was darker than I would like to see, indicating
lean</DIV>
<DIV> </DIV>
<DIV>Fuel delivery was compromised somehow after the first minute or two. I
did some playing around with making certain the pump wasn't being blocked
from cooling ram air, re-plumbed the tank and everything else, used large
bore tubing throughout, etc. Problem persisted.</DIV>
<DIV> </DIV>
<DIV>Took a close look at the vent's one-way valve (standard YS valve) and
saw that this was sticking. Removed it. To avoid syphoning of fuel
through the vent, I looped the vent line and secured with a tie strap
forming a P trap.</DIV>
<DIV> </DIV>
<DIV>Also increased pump pressure about 1/4 turn. These changes have helped
richen the engine to normal levels. </DIV>
<DIV> </DIV>
<DIV>MattK</DIV>
<DIV> </DIV>
<DIV> </DIV></BLOCKQUOTE></BLOCKQUOTE></FONT></BODY></HTML>