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Valve springs that do not resonate are progressive, wound with varying pitch or varying diameter called beehive springs [15] from their shape. The number of active coils in these springs varies during the stroke, the more closely wound coils being on the static end, becoming inactive as the spring compresses or as in the beehive spring, where ...
The valve springs feature a beehive shape and smaller retainer. The reduced weight and spring load further help lower friction and improve fuel economy. The valvetrain is driven by a silent-type, maintenance free steel timing chain that replaces a roller-type timing chain: The optimized design greatly reduces impact forces and noise when the ...
In 1921, E. J. Hall began developing the valve system of Duesenberg racing engines and developed new cam lobe profiles that improved engines' reliability and power output. His research provided an understanding of the importance of the gradual opening and closing of valves and the effect this had on valve spring durability in high-speed engines.
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Pneumatic valve springs are also found in several Moto GP motorcycle engines, debuting in 2002 with the Aprilia RS Cube. In 2005, Team Roberts was the first to use pneumatic valves full-time in their uncompetitive KTM powered bike.