This 1954 Tenora Dynamic 40 is a BMW motorcycle 750 air-cooled boxer-twin-powered special built for the Ecce Homo hillclimb by Czech racer Jan Tenora, who sadly lost his life behind the wheel of a more powerful version a few years later. Output is quoted as 45 HP, motivating a claimed 750 pounds for a top speed north of 95 MPH. The ad notes a former restoration effort, as well as good running order. Overall it’s a very interesting and well built looking little machine, and the very event it was built for still exists–hopefully there’s a class to accommodate it. Find it here on mobile.de in Jinocany, Czech Republic for 52k euros (~$64k USD today). Special thanks to BaT reader Kyle K. for this submission.

Bodywork is composed of thin gauge lightweight sheet metal which takes a low-profile, aerodynamic shape. Restoration work isn’t dated, but things show well in high-resolution photos, and finish stands up nicely in a few closeups under warehouse lighting. A pair of Brooklands screens are in place for the pilot and co-driver, with the higher of the two showing some pitting. Large decals on the doors indicate that the car participated in a vintage rally of some kind in 2010. Wheels are a set of knock-off wires wearing a thin set of vintage looking tires. Full lighting is also visible front and rear, something that was not present in original period photos.

This side profile gives a nice impression of how the racer cut through the air. A Dynamic 60 powered by a 1000cc engine was also constructed, which Tenora lost his life behind the wheel of in 1956.

Shots of the interior show good looking upholstery that doesn’t display much wear outside a of a few creases on the driver’s side. Just the necessary gauges are set up, and the gearshift is operated a few inches away from the steering wheel. There’s one rearview mirror between the two windscreens, but no harness, belts or other safety equipment to speak of–at least not that we can see. Note the gated shift, exposed gearbox case and cool looking instrumentation.

A BMW motorrad 750cc twin producing 45 HP drives the rear wheels. An engine of this displacement first appeared in the BMW WR 750 supercharged racing bike of the late 1920’s, and a unit of the same size and underlying architecture was later a proposed powerplant for the prototype 331 (also called the 531) which never became a reality. Presumably this one’s a tuned-up WW2 Era OHV R75 unit.The little boxer seems right at home in this lightweight racer, and also makes for a nice sight with the cowling panel removed.

Here’s a photo of the Dynamic 40 alongside its more powerful stablemate, which appears to have needed extra cooling when looking at the the added vent in the engine cover.

We’d love to know more about the history of this car, but resources seem pretty scarce in that department. Nevertheless, it’s a very interesting machine and we hope its next owner continues to drive it in vintage events.