Combustion confusion
Article Abstract:
Unconventional combustion engines in motorcycles cause confusion as to whether they are two-stroke or four-stroke. For instance, the Wankel engine is sometimes mistaken for a two-stroke engine because it has no cylinder and poppet valves. Wankel is actually a four-stroke combustion engine.
Publication Name: Cycle World
Subject: Sports and fitness
ISSN: 0011-4286
Year: 1998
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Burn baby burn: valves and more valves
Article Abstract:
Yamaha motorcycles are famous for their signature five-valves-per-cylinder engines. Company engineers found that the five-valve engine improves intake airflow, prevents masking and accelerates combustion. Four Daytona motorcycle race championships evidence the efficiency of these engines.
Publication Name: Cycle World
Subject: Sports and fitness
ISSN: 0011-4286
Year: 1997
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Spring to action
Article Abstract:
Motorcycle designers have attempted to solve the problem of valve spring surge by replacing springs with paired cams, using hairpin springs and using fewer coils. An air-assisted spring system is another possibility.
Publication Name: Cycle World
Subject: Sports and fitness
ISSN: 0011-4286
Year: 1993
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