OS BEARINGS

[Wayne Galligan]

Then a grove machined in the bottom of the crankcase up to the opening of the crank inlet would be the place to make this groove...right?   How could one do this with standard shop tools and not ruin his engine?

Wayne
  ----- Original Message ----- 
  From: Karl G. Mueller 
  To: discussion at nsrca.org 
  Sent: Tuesday, August 05, 2003 8:52 AM
  Subject: Re: OS BEARINGS


  Wayne,

  On the compression stroke the passage in the crank
  for the carb would be opposite to the carb opening and 
  therefore closed.

  Karl.
    ----- Original Message ----- 
    From: Wayne Galligan 
    To: discussion at nsrca.org 
    Sent: Tuesday, August 05, 2003 9:22 AM
    Subject: OS BEARINGS


    If you machined a groove towards the rear bearing you would lose crank pressure or get blow back to the carb opening from the crankcase pressure wouldn't you?

    WG
      ----- Original Message ----- 
      From: Verne Koester 
      To: discussion at nsrca.org 
      Sent: Monday, August 04, 2003 10:39 PM
      Subject: Re: Mintor 140 Bearings


      Bob,
      Interestingly enough, my RX has the groove you describe going forward toward
      the front bearing (which is shielded anyway) but nothing rearward. I
      considered that as a last option if nothing else worked, but haven't needed
      to as yet.

      Since they already have a shielded bearing in the front, I have to assume
      that groove is there to lube the crank journal in the case between the carb
      opening and the front bearing. If that's the case, then why no groove to
      lube the journal between the carb opening and the rear bearing? Friction
      equals heat, right? Maybe they're relying on the heated aluminum case
      expanding enough to allow oil in there but then there'd be no reason for the
      forward groove.

      Verne
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030805/50b6582f/attachment.html