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Development of Titanium Engine Valves for Motorcycles

Recently, it has been expected that titanium alloy valves will be adopted at extremely high rate to motorcycle engines where higher engine performance is required than in automobiles. However, there were difficulties with respect to reliability required for motorcycle engines. The reason for this is that engine valves of motorcycle engines are not only smaller in stem diameter, but also used at a higher maximum engine speed than those of automobile engines. This study is about a development of titanium alloy engine valves that meet reliability requirements in motorcycle engines.