Two eccentrics top and bottom coupled by links resembling con rods - phased at 90 degrees.
"the problem of overcoming differences in thermal expansion between the links and the cylinder is met by providing a member between the two shafts which maintains them at the same center-distance as the links, the variation in timing thus caused being negligible"
now you know as much as i do - and that was written by one of the best technical writers ever....
My brother had a Sport Max 250 NSU and i remember we looked at the setup, found it ran at more clearance in the "conrod" bores than it should but was silent and working well - so buttoned it up and left it alone....
I think Bentley used the same system in one of the big motors in the 20's.
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