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 the drag engines but was probably unneeded "insurance" on
the road race engines. 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.
On 8/11/2020 1:43 PM, Mark Langford via KRnet wrote:
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 contract 15 years ago, and I made a trip to their factory in
Germany to see the factory, including crank assembly with a giant
press. Not sure you could say "in common use" though.....
Mark Langford
m...@n56ml.com
http://www.n56ml.com
Huntsville, AL
_______________________________________________
Search the KRnet Archives at
https://www.mail-archive.com/krnet@list.krnet.org/.
Please see LIST RULES and KRnet info at http://www.krnet.org/info.html.
see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to
change options.
To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
_______________________________________________
Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/.
Please see LIST RULES and KRnet info at http://www.krnet.org/info.html.
see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change
options.
To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
