Paul, here is a link showing a list of the NSU Wankel developments.

http://www.der-wankelmotor.de/Motoren/Motoren_NSU/NSU-Motorentypen/nsu-motorentypen.html

E stands for Experimental. The A after the E is likely the first series
named alphabetically. But that is just my assumption. I was gone by then.
The EA871 was the one great hopes were build on. You see the years of
development from 1973 to 1978. 4th generation, optimized KKM Optimo.
The initial KKM-871 name was still in use as well, see left most column.
The 866 and 871 were the two largest ones build, 746 cc per chamber.

Rolf


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