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The Development of One Liter Motorcycle Engines
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English
Abstract
A new 0.9-liter 4-valve-per-cylinder liquid cooled engine was developed for 1984 model motorcycles. This new engine was optimized from the standpoint of performance, durability, and weight efficiency. Semi-Flat slide carburetors, high compression ratio, relatively short stroke and large valves were employed. This engine was upgraded every other year with changes in displacement. Induction system, exhaust system, and valve train. This paper describes, from the viewpoint of the designer, the evolution of the 4-valve liquid-cooled engine from the 1984 to 1988 models. In that evolutionary process we employed: (1) semi-down draft carburetors with smooth air ducts, (2) a computer-aided intake and exhaust port design and manufacturing system. (3) individual rocker arms. (4) a cool air intake system. (5) lightweight pistons. (6) angle -controlled tightening of connecting rod bolts.
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Citation
Yamada, K., "The Development of One Liter Motorcycle Engines," SAE Technical Paper 891800, 1989, https://doi.org/10.4271/891800.Also In
References
- Gruden D. Richter H. Wurster W. “Combustion Chamber Investigation at Porsche,” SAE Paper 845005
- Blech J. J. “Heat Transfer and Stress Analysis of Engine Heads and Evaluation of Methods of Preventing Head Cracks.” SAE Paper 820504