A New Take on the Double Rotary Valve: A Profile of Kingwelle

During a visit to Scooter Center at Kingwelle in Lindau, there were some real technical highlights to marvel at, including an extremely rare small-frame twin-rotary-valve engine from 2017 designed for DBM races. Since classic rotary vane engines on the market often reach their performance limits and many drivers are tired of the typical, rough sound of high-revving rotary vane engines, the Cramer brothers set out to develop a revolutionary solution. The result is a completely newly developed large-frame twin rotary-piston engine that perfectly combines power with early, robust torque right from the low end.


Kingwelle Shop

The first test run of the unmachined Quattrini M244 cylinder with a 64 mm stroke and 128 connecting rods on the new double rotary valve layout was a huge hit: From a standstill, the engine delivered a sensational 35.6 PS and just under 40 Newton-meters of torque—all while maintaining performance suitable for everyday driving. In a direct comparison to conventional designs, the system stands out above all for its powerful throttle response in fourth gear when climbing hills, without any of the annoying, high-pitched screeching typical of pure high-revving sport engines, which is often a nuisance in everyday riding.

In addition to pure performance, the well-thought-out modularity of the new engine case is particularly impressive; it does not require any disruptive frame extensions and fits into original large-frame chassis. Thanks to flexible mounting options for swingarms, shock absorbers, and brakes, as well as variants for unmachined cylinders or planned 306cc displacements, the system can be customized to suit individual needs. True to the motto “Only the best is good enough,” Kingwelle once again demonstrates genuine craftsmanship and expertise for everyone seeking reliability and riding enjoyment.