The aluminum unit housed the three-bearing crankshaft and cylinder liners. The aluminum unit head contained eight vertically-arranged valves that were directly activated by the camshaft arranged above them. The original option was to use short crossbeams, but this idea was later abandoned. Both the camshaft and the oil pump located in the engine sump were driven by the cog wheels from the crankshaft.
The oil pump played a leading role in the total design since the Windhoff motorcycle engine was cooled with oil. Circulating under pressure between all stressed parts of the engine the 6.5 liters of oil set onto the walls that were heavily ribbed on the outside, and then it cooled off while flowing down into the sump—thus no oil cooler was needed.
A 3-speed manually-switched gear box with the multiple-disc clutch, the kick starter and the transmission brake controlled by a foot pedal were directly affixed to the engine. The whole power assembly was the base of the suspension system: a forged frame with the steering column was “put onto” the cylinder head, from the top, while at the back horizontal tubes extended from the gear-box casing and between these tubes the sump of the cardan main gear was secured (well, it was actually torsional for the rear suspension was rigid and universal joints were not used).
The front fork of the Windhoff motorcycle was a leading link fork, rather complex in its design, and two short quarter-elliptic springs were used as elastic elements. The manual drum-type brake was installed in the front wheel flange. The speedometer was arranged on the fuel tank that had capacity of 14 liters. The 4-cylinder Windhoff had a mass of 185 kg and it could achieve a maximum speed of 120 km/h. These motorcycles did not enjoy a great commercial success, but there was a stable demand for them coming from the connoisseurs of technology.
|Manufacturer||Windhoff Motorenbau GmbH, Berlin (Germany)|
|Years of manufacture||1927 – 1931|
|Quantity produced, units||1 450|
|Price||1 750 RМ|
|Today’s value||5083,34 $|
|ENGINE AND TRANSMISSION|
|Engine capacity, cc||748|
|Bore and stroke, mm||63 х 60|
|Engine rating||22 h.p. at 4000 rpm|
|FRAME AND WHEELBASE|
|Frame type||Engine makes up the frame|
|Front suspension||Quarter-elliptic spring|
|Brakes||Manual, drum-type, at the front wheel|
|Wheel size||3,85 х 20|
|Ground clearance, mm||
|Seat height, mm||
|Gas tank size, l||
|Maximum speed, km/h||