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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 used on LeBlond and Ken-Royce engines were of the volute spring type which is wound in a beehive shape out of strip steel, unlike most engines, which have nested coil springs wound from round wire. This type of spring was inherited from the original Detroit Air-Cat as at the time of the Air-Cat design in the late twenties ...
Stiffer valve springs can help prevent valve float and valve bounce but at the expense of increased friction losses, higher stresses, and more rapid wear in the valvetrain. Various techniques have been used to offset the effect of stiffer springs, such as dual-spring and progressive-sprung valves, roller-tipped tappets, and pneumatic valve ...
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 ...
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.
If you're looking for a new feature to keep yourself busy in FarmVille 2, the new Bee Box is sure to be the thing for you.This Bee Box comes packed with bees that will fertilize your crops, giving ...