OS BEARINGS

[Karl G. Mueller]

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
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