Losing oil pressure is bad right away in a plain bearing engine,
sometimes not so in a roller bearing engine. 4 stroke roller cranks can
run for a remarkably long time after losing oil pressure, though
sometimes they don't. You can't count on it.
On 8/11/2020 2:52 PM, Flesner via KRnet wrote:
On 8/11/2020 3:12 PM, Chris Kinnaman via KRnet wrote:
Kawasaki went to plain bearings on their 4 strokes after that due to
the greatly reduced internal friction and reduced rotating mass,
which would seem to be the advantage exploited by (most of?) the
airplane engine folks so many years before.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I'm not an engine guru but I was wondering why you would want roller
bearings, which I assume would be much more expensive and, as you
stated, less adventurous. then plain bearings. The "plain" bearings
in my 0-200 went 2400 hours and 40 years and would have gone another
500 hours easy if I had left them alone. They left not a single mark
on my crank anywhere and my crank measured very usable by two
different shops, better than minimum service limits and nothing out of
round. I let no one touch it to screw it up and reassembled using new
bearings. I'm guessing it will perform longer than I will.
Larry Flesner
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