Webra Problem

[Randy]

MessageIt sounds like I may have a pump problem.  I may need to send it in to get it fixed.  Do not seem to be able to get is too rich; even after turning puimp pressure in one turn.

But it does seem to be somewhat better.  Low to mid-range seems to work just fine.  Just going past mod-range on a upline seems to be a problem.

Randy
  ----- Original Message ----- 
  From: Lee Davis 
  To: discussion at nsrca.org 
  Sent: Wednesday, June 09, 2004 6:22 PM
  Subject: RE: Webra Problem


  Check the high end mix on the ground.  If you can set it so the engine is obviously too rich then you do not have a pump problem.  If you cannot, then replace the pump diaphrams.  They can distort if the pump gets overheated which is not uncommon.

  If you have a lot of time on the engine you might be due for a rebuild.  Replace the rear bearing, con rod (it tends to get sloppy on the wrist pin) and ring.  Assuming you have an AAR the sleeve will outlast several ring replacements.

  The 1.60's are cool and all, but the truth is a solid 1.45 will yank an even overweight pattern plane around like a toy.  IMO, stick with it.  If you have a few bucks to spare buy it one of the mixture control carbs - sweet setup.

  Lee Davis
  Piedmont Models
    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Randy
    Sent: Wednesday, June 09, 2004 1:56 PM
    To: discussion at nsrca.org
    Subject: Webra Problem


    My webra 145 with a normal carbo seems to be losing power on the up lines.  It seems to me that the pump should delive a near constant flow of fuel.  So I should not need to have is real rich on the high end to handle the up lines.  But still losing power on uplines, so have been richening it.

    Low end seems fine.
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