Webra 145 surge seems fixed

[Brian Young]

Turning the screw in on the regulator increases the
pressure. Backing out the screw reduces the pressure.

The adjustable spring tension controls when the
diaphragm opens allowing fuel to bypass back into the
inlet side of the pump.

--- Dennis Cone <cone.man at verizon.net> wrote:
> It seems to me that  the screw on the Webra pump is
> a travel limiter screw
> and screwing it in will decrease the travel of the
> diaphragm and thus
> decrease the volume and pressure of fuel out of the
> pump. I have flown Bully
> ’s in the past and have taken the pumps apart
> several times, and that is how
> I interpreted the operation of the pump. Am I wrong?
> Any thoughts on this?
> I am glad you were able to get your problem fixed.
> 
> 
> Dennis Cone
> 
> 
> 
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On
> Behalf Of Earl Vincent
> Sent: Thursday, May 22, 2003 3:28 PM
> To: nsrca
> Subject: Webra 145 surge seems fixed
> 
> I finally got the Focus done and started to work on
> the Webra 145, last time
> I ran it I had a mid range blank in the throttle
> curve
> that had me fooled a few times that the engine had
> quit when it was still
> running. Tuesday I used most of the afternoon to
> make
> adjustments to finally get the engine running
> perfect. FYI this is exactly
> what I did, every body has an opinion but this made
> the
> engine very adjustable and the transition was fine.
> Took up first flight, long surge coming up on mid
> throttle after long done
> line, spin etc., landed, loosened engine and
> adjusted
> pump screw in 1/4 turn, flew again a little bit
> better, repeated the 1/4
> turns 4 more times each flight becoming better until
> after
> the last 1/4 it transitions, idled and ran top end
> flawlessly the rest of
> the day. The clue I got was that I have a Webra 120
> pumped
> with the same pump and carb on my Ultimate and it
> has run with little
> adjustment right out of the box but the main needle
> is only
> out about 1.25 to 1.5 turns out, the 145 at the
> start of this was out 2.5
> turns and was still a little lean, after richening
> the pump the
> 145 needle is now out about 1.5 turns out, it may or
> may not have anything
> to do with it but I thought I would share my
> findings.
> Good Flying to Ya'll
> Earl Vincent
> 


=====
Brian Young
Tulsa
b4598070 at yahoo.com
918-745-6046h
918-838-0900w

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