1953-01-01

Relationship of Valve-Spring Design to Valve Gear Dynamics and Hydraulic Lifter Pump-up 530263

THE author shows how the success of a valve-spring design is intrinsically related to both the cam design and the valve gear dynamics obtained at high engine speeds.
Good valve gear dynamics, which is characterized by minimum vibration, he says, minimizes hydraulic lifter pump-up tendency and greatly simplifies the job of making a satisfactory spring design.
He shows that the use of the smooth-acceleration curve is very helpful in producing good valve gear dynamics, and that it is to be recommended over other types.
The author also discusses the use of dual springs and cyclo-pelting and presetting of springs.
Discussion of this and other papers on “Valve Gear Problems in Modern Overhead-Valve Engines” starts on page 714.

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