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Rich

interesting article BMW M12 engine

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Interesting, but as usual not factually correct.  The range of M12 moto,rs goes from M12/1 - M12/13.  Some of the early ones were 'parallel and diametral' motors.  In 1973 they were using the M12/6 in F2 which made around 275bhp, the M12/7 was introduced in 1974 and manufactured by Motorsport through 1979 and used in F2, Gr. 2, Gr5, and various sports racers (Chevron, Lola, March and probably a few others).  Horsepower, 'allegedly' up to 320bhp (@ 10,ooo rpm <which means that motor was probably only good for a few hours>).

No idea really about motor production numbers I would guess there were a few more (maybe) than that between the M12/6's and 7's.  Just an fyi for whatever its worth.  They are incredible engines for sure, engineering masterpieces with a very unique sound.

 

 

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