[SPAM] Re: A Bearing Tip - Boca Bearing Newsletter

[Keith Black]

Dave, did you do something to reduce the compression/timing such as adding a shim to the Webra 160?
  ----- Original Message ----- 
  From: David Lockhart 
  To: discussion at nsrca.org 
  Sent: Thursday, May 19, 2005 11:04 PM
  Subject: Re: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter


  With specific reference to the OS140, I gotta agree - use the sealed SS BB with both seals.  I've seen 500+ flights.

  I'm also concluding that much of the damage to rear bearings is from running the engines overcompressed resulting in pre-ignition (detonation, pinging, etc).  I just changed the stock bearing in a Webra160 after about 400 flights - all with the compression substantially reduced.  Several years ago, a Bully (Webra) 145 I ran needed new bearings every 100-150 flights, and was relatively much more compressed.

  Dave

    ----- Original Message ----- 
    From: Verne Koester 
    To: discussion at nsrca.org 
    Sent: Thursday, May 19, 2005 11:18 PM
    Subject: Re: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter


    Rodney, 
    If you're putting it in an O.S. 1.4, definitely leave the seals in. You'll get 300-500 flights with the seals in. With them out, you'll be lucky to put 5 gallons  through the engine before they're shot!

    Verne Koester
      ----- Original Message ----- 
      From: Rodney Tanner 
      To: discussion at nsrca.org 
      Sent: Thursday, May 19, 2005 10:33 PM
      Subject: [SPAM] Re: A Bearing Tip - Boca Bearing Newsletter


      Bob, So using an OS 140 EFI bearing, is it advisable to remove the seals?
      Rodney

      Bob Pastorello <rcaerobob at cox.net> wrote:
        Since I use theirs, I get this e-newsletter.  This month's tip;
        <<If your Front engine bearing has two rubber seals you should not remove them. These bearings have their own grease and can help stop oil leaks. If your bearing has two shields, we recommend you remove one of them. For instructions on removing your shields take a look at this Help Section.

        Your Rear engine bearing should be open on both sides to allow as much fuel as possible to pass through and act as a lubricant. You may however want leave one shield on in the rear which would help to protect the rest of the engine from any foreign matter getting through. This should not be done with one seal. If you find your engine is stingy in getting fuel to the rear, you should definitely leave the bearing open.
        In our next issue of the Boca Bearings Tips & Advice Newsletter we will show you how to remove your bearing shields. >>

        Note - if you open your crankcase, using sealed bearings, and the crankshaft counterweight it dry-looking, or the lower part of the bearing isn't pooling oil, you may think about removing the seals.  I do, for this reason.


        Bob Pastorello
        www.rcaerobats.net
        rcaerobob at cox.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050520/5b9d7d89/attachment.html