I stumbled across this site by accident. I thought this would be a good place to find out if this technology has any merit.

http://www.neander-motors.com/company/index_en.php

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62 220sb
67 250S
72 280SE 4.5
74 280C
77 300D
82 240D
85 190E 2.3
86 300E RIP 12/28/09
85 300SD
92 300D 2.5
00 E320 Current
Over 1,000,000 miles in Benzes, Since66

....and a whole passel of BMW 2002 and Tii

Their slogan: "Two crankshafts for twice the frictional losses!"

Its nothing new. Just another variation of the existing reciprocating piston engine design.

Another variation, but it appears that there would not be a side load on the piston. If this is the case, it could be a real advantage.

A scotch yoke has the same benefit but with much fewer moving parts and bearing surfaces.