Webra Problem

[Lance Van Nostrand]

Don't focus on the 4 threads.  Different pipe/fuel/cooling setups will slightly change the optimal set up.  The pump appears to be working because you made a change an noticed a difference.  You shouldn't really be seeing a difference on the ground and in the air with the Webra.  Tune it for peak (minus a few clicks) and it should remain.  
   I'm surprised if it really is changing in the latter half of the tank.  this shoulnd' be true if all is working well.  If everything is (i.e. pump) then maybe there is a cooling issue.  Can you fly without the chin cowl?  I had this problem once with a Prophecy of all things.  Even though the head was sticking in the breeze, the cowl was making some cooling problems.  This actually was a Bully, which is a webra.  If these simple things are exhausted, then maybe the pump diaphram needs service.  If you could swap a pump from a friend, that would ice it.
-_lance

  ----- Original Message ----- 
  From: Randy 
  To: discussion at nsrca.org 
  Sent: Thursday, June 10, 2004 10:01 PM
  Subject: Re: Webra Problem


  I got the engine new used last year.  It ia a AAR.  Did not fly that much last year; but the engine mostly ran well.  Sometime go a little rich and lose a little vertical.  Has been less reliable this year after the winter.

  Throttle up before vertical and bogges part way up about half the time.replaced fuel tank earlier this week.  Turned pump pressure in one turn today.  Have high end around 3 turns out.  I see smoke on the ground, but much in the air.  Seem to bog more on the latter half of the tank.  Moved tank to just in front of wing tube to shorten line to pump;but did not see any change.

  No idea how many flights before I got it, but not that many as owner decided to stay with OS 140.

  I am going to clean carb out in the morning.  And check to see if the pump pressure is at four threads.

  Randy

    ----- Original Message ----- 
    From: Keith Black 
    To: discussion at nsrca.org 
    Sent: Wednesday, June 09, 2004 2:12 PM
    Subject: Re: Webra Problem


    Randy, 

    Is the Webra new (or new to you)?

    Has it been running well and now it's not doing so well or has it always had problems?

    Has the pump ever been adjusted since it was new?

    When loosing power on the uplines is it wide open then bogging down after being in the upline for a while, or are you increasing throttle while in the upline and then it's coughing?

    How much smoke does it blow when wide open in level flight?

    How many flights do the bearings have on them?

    Keith Black

      ----- Original Message ----- 
      From: Randy 
      To: discussion at nsrca.org 
      Sent: Wednesday, June 09, 2004 12:55 PM
      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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