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.

Evaluation, Engine cylinders, Wankel engine, Wankel engines

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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.

Analysis, Product information, Motorcycle industry, Valves, Yamaha Motor Company Ltd.

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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.

Column

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