MC carb for Webra
Woodward James R Civ 412 TW/DRP/ACQ
James.Woodward2 at edwards.af.mil
Thu Jun 5 11:45:54 AKDT 2003
I think the 31.5" is correct from plug to aft edge of pipe. That means you
cut the header down some. I did this, and it worked just fine for my Webra
R and AAR.
You can adjust the engine to run perfect on the ground. However, if you
hear a "pop" when pushing from inverted and adding power, you will need to
RICHEN the midrange.
Jim W.
-----Original Message-----
From: Jerry Budd [mailto:jbudd at QNET.COM]
Sent: Thursday, June 05, 2003 8:26 AM
To: discussion at nsrca.org
Subject: Re: MC carb for Webra
Brian,
According to the Piedmont website the baffle is 4" ahead of the aft
end of the pipe so that puts you at ~27.5" from plug to baffle. When
I tried the Greve pipe that Piedmont sells, I found that to be too
long (way down in power compared to my ES pipe at ~24" plug to
baffle).
Lee, Jim W., Matt - Are these needle settings close? I haven't run
the ProMixII carb in a while.
It sounds to me like the pipe may need to be shortened some, and the
low end richened up a bit. You also probably got the motor a bit hot
when the pump got FOD'd and that's why the internals are a bit dark.
Jerry
>That is from the center of the glow plug to the end of the large portion of
>the pipe, does not include the stinger. Not sure where the first baffle is
>located at.
>----- Original Message -----
>From: "Jerry Budd" <jbudd at QNET.COM>
>To: <discussion at nsrca.org>
>Sent: Thursday, June 05, 2003 10:09 AM
>Subject: Re: MC carb for Webra
>
>
>> Brian,
>>
>> The 31.5" pipe length you quote, what is that from? In other words
>> what is the distance from the plug to the first baffle in the pipe?
>>
>> Jerry
>>
>> > Jerry, my setup is as follows: Webra 145 red head, greve pipe at
>31.5",
>> >os typeF plug, cool power 15%, APC 17*12, 10lb. 2oz. Prophecy. Current
>> >settings on engine are 1 turn on high speed needle, 1 1/16 on low speed
>> >needle. I am guessing low 8k for top end rpm on the ground slightly
rich
>> >{have not tached the 17*12 but I was getting high 8600 or so with
17*10.
>> >Engine starts good and idles reliably but transition is not very
>linerier.
>> >In flight it sounds good with straight and level flight at a little
less
>> >than half throttle, when pulling to a 45 up line it sags momentarily
but
>> >recovers, on tall verticals or loops it will sag toward the top and
loose
>> >roughly 1\2 of it's rpm and that is with me adding throttle through the
>> >maneuver, engine with not regain good power unless you go to at least
3\4
>or
>> >better with throttle. I get no smoke trail out of engine until full
>throttle
>> >and oil out of the pipe is pretty dark but not black, top third of
piston
>> >and ring is black like cyl. temps have been high. Condition is better
>with
>> >low speed needle set richer but it's easy to flood on start ups and is
>hard
>> >to keep running when cold {must keep a very fast Idle speed until your
in
>> >the air}. I have found trash in the pump and pump screws came loose
>twice,
>> >last week I pulled pump apart again and no trash was found but screws
>where
>> >loose, I cleaned all parts in warm water and dish soap, removed tank
and
>> >cleaned, ran large fuel tubing from clunk to carb. All fuel is filtered
>from
>> >the jug and I have a filter between tank and pump. That is about all I
>can
>> >think of, any suggestions would be greatly appreciated.
>> >----- Original Message -----
>> >From: "Jerry Budd" <jbudd at QNET.COM>
>> >To: <discussion at nsrca.org>
>> >Sent: Thursday, June 05, 2003 12:32 AM
>> >Subject: Re: MC carb for Webra
>> >
>> >
>> >> Hi Brian,
>> >>
>> >> What's your setup? i.e. pipe & length, plug, prop, fuel, airplane
>> >> (including weight), rpm's, etc.
>> >>
>> >> The reason I'm asking is I've got quite a bit of experience with the
>> >> Webra's (including the MC carb) and I may be able to suggest some
>> >> work arounds until the MC is available again via Horizon (I'm
>> >> guessing but they probably underestimated the demand for the carb
and
>> >> got caught short on stock).
>> >>
>> >> Jerry
>> >>
>> >> >Sounds interesting Jim, let me know how it works out. Mine is
>> >> >driving me crazy, I have it running ok right now but it is kind of
>> >> >off and on type of power. I have been flying her but I know it is
>> >> >not right, still managed to get a gallon through it sunday with
easy
>> >> >starts good reliability but as far as uplines go it is either all
or
>> >> >nothing, no middle.
>> >> >
>> >> >----- Original Message -----
>> >> >From: <mailto:jivey61 at msn.com>jim ivey
>> >> >To: <mailto:discussion at nsrca.org>discussion
> > >> >Sent: Wednesday, June 04, 2003 10:30 PM
>> >> >Subject: Re: MC carb for Webra
>> >> >
>> >> >Brian
>> >> >I put a cline regulator, a regular back plate with a press. tap,
and
>> >> >pressurized the tank on my Webra. The ground runs have been more
>> >> >stable for throttle position The needles are a lot less sensitive
>> >> >and it doesn't seem to be fat in the middle.
>> >> >When I find some time to fly I think it will finally run good. I
>> >> >must have had a pump problem because too many people are running
>> >> >this engine. I did find a piece of foreign material in the pump.
>> >> >This was in the pump from day one. I used a YS filter and nuttin'
>> >> >gets through a YS filter.
>> >> >Will let you know when I fly it, how it does.
>> >> >
>> >> >Jim Ivey
>> >> >
>> >> >
>> >> >----- Original Message -----
>> >> >From: Brian Billings
>> >> >Sent: Wednesday, June 04, 2003 2:10 PM
>> >> >To: discussion at nsrca.org
>> >> >Subject: Re: MC carb for Webra
>> >> >
>> >> >Thanks Tony, that is what I thought.
>> >> >
>> >> >----- Original Message -----
>> >> >From: <mailto:tony at radiosouthrc.com>Tony Stillman
>> >> >To: <mailto:discussion at nsrca.org>discussion at nsrca.org
>> >> >Sent: Wednesday, June 04, 2003 9:45 AM
>> >> >Subject: Re: MC carb for Webra
>> > > >
>> >> >Brian:
>> >> >
>> >> >Horizon is the USA importer for Webra, so if they are out, you
>> >> >probably won't find one. The only other answer is to go direct to
>> >> >Webra in Europe.
>> >> >
>> >> >Tony Stillman
>> >> >Radio South
>> >> >3702 N. Pace Blvd.
>> >> >Pensacola, FL 32505
>> >> >1-800-962-7802
>> >> ><http://www.radiosouthrc.com/>www.radiosouthrc.com
>> >> >
>> >> >----- Original Message -----
>> >> >From: <mailto:auto7832 at bellsouth.net>Brian Billings
>> >> >To: <mailto:discussion at nsrca.org>discussion at nsrca.org
>> >> >Sent: Tuesday, June 03, 2003 8:29 PM
>> >> >Subject: MC carb for Webra
>> >> >
>> >> >Does anyone know where I can buy the Webra MC carb, Horizon shows
>> >> >them on their website but they don't have any in stock and where
>> >> >unable to tell me when they would. Thanks in advance
>> >> >
>> >> >Brian Billings
>> >>
>> >>
>> >> --
>> >> ___________
>> >> Jerry Budd
>> >> mailto:jbudd at qnet.com
>> >> =====================================
>> >> # To be removed from this list, send a message to
>> >> # discussion-request at nsrca.org
>> >> # and put leave discussion on the first line of the body.
>> >> #
>> >>
>> >
>> >
>> >=====================================
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>> >#
>>
>>
>> --
>> ___________
>> Jerry Budd
>> mailto:jbudd at qnet.com
>> =====================================
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>>
>>
>
>
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--
___________
Jerry Budd
mailto:jbudd at qnet.com
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