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BMW Motorcycles

BMW R5 1936 494cc

BMW-1936-R5-MANT-1.jpg

BMW R-5 494cc OHV Flat Twin


Production years: 1936-1937
Power: 24 CV at 5800 rpm
Capacity: 494cc
Engine: OHV HO twin
Transmission: Cardan
Maximum speed: 135 Km/h
Units produced: 2,652
Weight: 165 Kg

In 1936 BMW introduced a completely new model with considerably more power than its predecessors, achieved by employing two chaindriven camshafts allowing for much shorter pushrods to the overhead valves, with a significant increase in maximum RPM as a result.

The engine was also used after the war, with minor changes, in the R-51/2.

HO Twin

Horizontally Opposed Twin

Examples include BMW, Zundapp and Douglas HO Twins have conrods running on a common crank, with one on the exhaust stroke and the other on inlet.
Cardan

Shaft Drive

Examples include BMW, Zundapp and Velocette LE Cardan drive eliminates chain and associated mess and maintenance. Often referred to as a "diff", the final drive unit consists of bevel crown and pinion gears.

Courtesy Motos Antigua HD