Hallo Paul,

I have found three photos of the 1970 version of the Mercedes-Benz /
Daimler-Benz 4 rotor engine as used in the C111 sports car.
At Daimler there were some very enthusiastic developer, for example
Bensinger, Lamm ...

Development ended 1975 or 1978 (?). About the last versions there are no
publications. Finally they used 2 spark plugs per chamber + injection into
the intake channel.

I think, in you can find a lot of english written informations in the
"endless world of the internet". Patent US 3398724A shows an early version
of the rotor recess layout - the pointed out, that you should concentrate
the mixture around the spark plug (relatively deep recess) + in the
direction of rotation + that you need some vortex / tumple / swirl or
something like that ...

Perhaps is the AVL range extender RE the continuation of the Mercedes
development. The next days I will send you a little bit about that small +
beautiful engine ...


With kindest regards

Frank (Herfert)

Great pictures Frank. Thanks.

Paul Lamar


Hello Paul,

here are 3 more pictures of the Mercedes RE ...

Perhaps you can find something in the books of J.P. Norbye (1971) + N. Faith
(1976) ...

With kindest regards

Frank (Herfert)


Not much in the Norbye book on the MB rotor tub.
Funny they never got the stratified charge to work.
Perhaps it would work with a glow plug for low speed and
a turbo for high speed.

Paul Lamar

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