The Menley Cyclecar 
(picture: All Car Index) 

the aircooled 999cc V-twin engine produced 8 hp

The engine used to power the Menely cyclecar was manufactured by a company named Burney Blackburne Ltd. The Blackburne engine was made from 1908 to 1937 and used by many British and European motorcycle and cyclecar manufacturers. 

The 8hp air-cooled engine had a three speed gearbox and chain/belt transmission. It was said to be capable of reaching 60mph.

The frame was made of ash with tubular metal cross members and sold for £250

Cyclecars were small, generally inexpensive cars manufactured mainly between 1910 and the late 1920s.

Cyclecars were propelled by single cylinder, V-twin or more rarely four cylinder engines, often air cooled. Sometimes these had been originally used in motorcycles and other components from this source such as gearboxes were also employed. Cyclecars were halfway between motorcycles and cars and were fitted with lightweight bodies, sometimes in a tandem two-seater configuration and could be primitive with minimal comfort and weather protection. They used various layouts and means of transmitting the engine power to the wheels, such as belt drive or chain drive often to one rear wheel only to avoid having to provide a differential.
The rise of cyclecars was a direct result of reduced taxation both for registration and annual licences of lightweight small engined cars. 

From 1898 to 1910, automobile production quickly expanded. Light cars of that era were commonly known as voiturettes. The smaller cyclecars appeared around 1910 with a boom shortly before the outbreak of World War I. 
By the early 1920s, the days of the cyclecar were numbered. Mass producers, such as Ford, were able to reduce their prices to undercut those of the usually small cyclecar makers. Similar affordable cars were offered in Europe such as the Citroën 5CV, Austin 7 or Morris Cowley.
The cyclecar boom was over. The majority of cyclecar manufacturers closed down. 

[see Wikipedia Article]