OS BEARINGS

[Wayne Galligan]

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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