To get the 16X displacement and they also narrowed the rotor width. They are doing that after finding out the flame propagation does not get all the way to the sides when the width is over 75mm. The 13B is 80mm.

To increase displacement from 1146cc (12A) which was 75mm wide rotors, to about 1600cc the eccentricity and radius need to be increased. E of 17.5mm and radius of 122.5mm which is up from 15 mm and 105mm. E17.5,R 122.5, W 70 gives 1560cc. E 18, R 126, W 70 gives 1660cc. Either would increase torque and help the combustion efficiency.

Dale Davies

They did not try side by side plugs. Austro engines has a wide rotor with
plugs side by side.

Paul Lamar


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