FYI, In the late 60's and early 70's there were roller cranks in racing
Porsche's and another company made some for early VW's to but the cost was
prohibitive. Back then they were about 7-8 hundred dollars when a standard new
crank was 40-50. Today I imagine it would be 6-7 thousand or more. Al;
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
2 strokes, of course, but I guess I should have stated 4 strokes. The
last 4 stroke roller bearing crank I saw was a 1978 or 79 Kawasaki
KZ1000. We welded a blob across a point on the inside edge of the throws
and outside edge of the pins to resist the throws from twisting - which
happened on t
Chris Kinnaman wrote:
> It would be
> interesting to find out - Anybody on the list know of any A/C engines in
> common use with roller cranks?
Hirth aircraft engines (at least some of the two stroke engines) use
roller cranks. We developed a new version of one of them for a US
military cont
Ken - My Rotec R3600 has roller crank bearings as most radial engines
do, but I can't think of any horizontally opposed aircraft engines
including VW-based designs that do not have plain bearings. It would be
interesting to find out - Anybody on the list know of any A/C engines in
common use wi
Much thanks to the guys that responded to my concerns about the axle bolt.
As I said, I know squat about aircraft engineering, I'm mostly a motorcycle
guy with a misplaced love of airplanes and flying.
I do find that bikes have a lot in common with aircraft, one case being the
complete roller beari
Joe Horton wrote:
>> That very thought makes me want to cry Jeff.
I thought there would be someone with the wisdom to buy that plane no
questions asked...<<
Yep, but we all know the explanationKR builders are usually building
KRs because they can be built on a budget, and we are a pretty
That very thought makes me want to cry Jeff.
I thought there would be someone with the wisdom to buy that plane no questions
asked...
Joe Horton, N357CJ
-
By comparison, One could buy the hopped up O-200 firewall forward off from my
KR for $12K, including Pmags, B&C starter, Plane Power alter
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