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<DIV><FONT face=Arial size=2>Oh man, I just hate to hear that! How many hours do
you have on this engine? Based on your posts it doesn't sound like too much.
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I hope we don't loose you for ever as a pattern
flier.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></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=auto7832@bellsouth.net href="mailto:auto7832@bellsouth.net">Brian
Billings</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> Friday, June 06, 2003 10:43
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MC carb for Webra</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Well, I would like to start off by thanking
everyone who has donated time and knowledge to this thread. It seems my
problems are much worse than I wanted. After reading the second half of Lee's
post last night I decided to pull the backplate and inspect for piston skirt
marks on the backplate, sure enough the con rod is shot so it looks like I am
in need of rod and pin, I will do the piston and ring as well to be
safe and to start off fresh with the motor. I will get it back
together and adjust pump to richen the midrange. I think I will put the
pattern ambitions off till next year, this whole thing has been a pain in my
ass, I was excited but now it feels to much like work {been dealing with
this since the beginning of march}. I think I am just going back to boring
some holes in the sky with my Edge until I get the urge again. Thanks again
everybody.</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=tkeithb@attbi.com href="mailto:tkeithb@attbi.com">Keith Black</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> Friday, June 06, 2003 12:17
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MC carb for Webra</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>In my neck of the woods, D6, I've never spoken
to anyone that has run a Bully or Webra that has *not* had to adjust the
pump settings, and some of the guys here have been running the Bullys for
about four years. They counseled me with my pump adjustments and it made a
tremendous difference. Besides, if it doesn't work you can always change it
back, just keep up with how much you change it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Keith</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=auto7832@bellsouth.net href="mailto:auto7832@bellsouth.net">Brian
Billings</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> Thursday, June 05, 2003 7:38
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MC carb for Webra</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Keith, Matt, I have not messed with the pump
yet but that is next, I had lots of mail that said don't mess with the
pump and a few that said it's ok. I have triple checked everything
else and adjusted needles 1/16 at a time from one extream to the
other, I guess adjusting the pump is in order. Is everyone in
agrement that increasing the spring pressure in the pump increases the
pressure.</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=tkeithb@attbi.com href="mailto:tkeithb@attbi.com">Keith
Black</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> Thursday, June 05, 2003 6:56
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: MC carb for
Webra</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Brian, have you experimented with
increasing the pump pressure? Maybe the upline mid-range is starving due
to not having enough fuel but WOT creates enough extra suction to pull
the fuel through. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you haven't already tried this why don't
you increase the pump pressure by 1/4 turn at a time and see if it
helps.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>BTW, you're correct that the throttle is
very non-linear. Once my carb is about half open the engine is much
closer to full throttle than mid throttle. I added a mix to my radio to
introduce an expo behavior with the throttle and this tremendously
improved how linear the throttle response is on my throttle stick. This
made the plane much easier to fly.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Good luck,</FONT></DIV>
<DIV><FONT face=Arial size=2>Keith Black</FONT></DIV>
<DIV><FONT face=Arial size=2></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=auto7832@bellsouth.net
href="mailto:auto7832@bellsouth.net">Brian Billings</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> Thursday, June 05, 2003
2:27 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> MC carb for Webra</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2> Bob, I was very
careful running this motor in, ran several tanks through engine before
flying and monitored the cylinder head temp the whole time. Motor ran
great the first weekend out with the plane but the next weekend motor
was having trouble from the first start of the day and I was
unable to fly due to troubles, sagging mainly. I sent motor to
piedmont for check out and they said it ran fine and had no problems.
I can hold engine against compression with no leak down felt but the
discoloration of the ring and top of piston does add credence to your
theory, plus it does seem like there is less compression once engine
has been ran to operating temperature. I would put a piston, ring and
liner in it if I new my problems would go away but I am afraid that it
is not the root of my problem but a outcome of the sagging in
flight. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><BR><FONT face=Arial><FONT size=2>Hi<BR><BR>I'm sticking my nose
in here, but I've been running the Greve (Piedmont) set up for some
time now and at their setting it WORKS, very well. I agree with
Jerry, by the way, the numbers are wrong, based on my theory, but it
works so I have not messed with it. Reading your symptoms, I
suspect you have a bad ring, allowing blow by into the crank case,
which changes with temp, which changes the crank case pressure, which
changes the "pump performance", which changes the temp, which
changes........ I have found that long before the ring is worn
enough to cause loss of compression/power it will upset the
pump/regulator (speaking of the OS here) because of combustion blow by
into the crankcase. Not enough leakage to effect peak
performance, but with crankcase pressure at 8-12 lbs (I think those
are the numbers) and combustion pressure at probably thousands
of lbs a little leakage could double the case pressure and screw
things up. I have found replacing the ring sometimes ring and
cylinder to solve this, anyway, the theory as to way is just that,
theory/speculation.<BR><BR>Hope this helps<BR><BR>Bob</FONT>
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