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<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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