Originally Posted by
wolfgang
Gentlemen,
there was (still is) just one company in Germany which makes and used to make (e.g. post-war Mercedes 8il racecars, which had roller-bearing cranks, certain Koenig cranks also for the 500cc 4-cyl world-record motor for Rolf Goetze, aircraft engines - whole and components therefore, Porsche Carrera 4-cyl four cam motors) cranks with tapered splines perpendicular to the CL. Name of company is HIRTH. Hence the spline arrangement is called Hirth-Verzahnung. Yes, you need a special spanner to assemble the crank throws. The pitches of the male and female threads were slightly different (Differential-Gewinde), so that the lot cannot shake itself apart.
I think I have a cross-sectional drawing of that 2-cyl rotary valve cross-flow Koenig block at home. Will have a look tonight, scan and post. Rgds, Wolfgang (engine builder apprenticeship in the mid-60s of the previous century)
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