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the jugs on my 1974 r90/6 were made of the same material and by same ppl as airplane engines...it was a colaborated effort between BMW and another German company ...each contributed their own expertise. I read about it over 20 yrs ago.... so thats all i can remember. Barnes & Noble, has books ( or can order) very interesting to be sure. BUT YEA, the same qualities and enginnering prowess was used in the jugs of both. I would guess it carried over to other parts as well. BMW m/c engines are very over built & and understressed as were the airplane cousins
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