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Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
In the 1930s, the United Kingdom and its former colonies also developed "clip-on" motors for bicycles (35 to 49 cc), followed by the "Autocycle" with a purpose-built frame incorporating pedals and a two-stroke engine (often a 98 cc Villiers engine), but without a gearbox (e.g. the Malvern Star). Autocycle manufacturers were well established in ...
Phillips Cycles Ltd. was a British bicycle manufacturer based in Smethwick near Birmingham, England. Its history began early in the 20th century and ended in the 1980s by which time it had become part of Raleigh Industries, itself a part of the Tube Investments group. For a number of years, the company was the second-largest bicycle producer in ...
Boxer crankshaft configuration. Most flat-twin engines use a boxer configuration for the crankshaft and are therefore called "boxer-twin" engines. In a boxer-twin engine, the 180° crankshaft moves the pistons in phase with each other, therefore the forces generated by one piston are cancelled out by the other, resulting in excellent primary balance.
The M4+2 engine, also known as the double-piston internal combustion engine, is a type of internal combustion engine invented by Polish patent holder Piotr Mężyk. [1] The M4+2 engine took its name from a combination of two-stroke engines and four-stroke engines. The two-stroke combustion engine is characterized by a simple construction and ...
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
Whizzer bicycle engines are a line of bicycle engines that were produced in the United States from 1939 to 1965. They were commonly sold as kits to be assembled and attached to a consumer's bicycle thus creating a motorized bicycle. Whizzer U.S.A. re-appeared in 1997 to sell an improved version, pre-assembled on an old Schwinn-style bicycle frame.
Phillips Cycles Ltd. was a respected British bicycle manufacturer based in Bridge Street, Smethwick, England. Founded by J.A. Phillips and E.W Bohle in Birmingham around 1892, its history ended in the 1970s, by which time it had become part of Raleigh Industries , itself a part of the huge Tube Investments group. [ 1 ]