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Rocker stands

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In the previous article on rocker stands, and as a general theme to the subject of pushrod valvetrains, the importance of stiffness was stressed. Also important though is that the mechanism is set up on the engine as intended when designed. This means that the relationship between the tip of the valve, the roller tip and rocker pivot are as designed. Not only does a badly set-up mechanism deviate away from the designed valve lift profile, but the relationship of the contact between the...

Solving the problem of valve spring breakage

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Finding the right valve springs for an inline four-cylinder USAC National Midget engine that makes upwards of 365 hp at the wheels could be a difficult procedure. But, says Erik Milholland, manager of the racing division at Kentucky-based Stanton Racing, "In the last couple of years we've found some really good springs." Stanton Racing fields both Mopar and Toyota Midgets in USAC competition. The company took over the build and rebuild procedures for California-based Toyota...

Choosing valve materials

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The question of valve material selection has been discussed before in the RET-Monitor. Much of the motivation for a given selection is provided by the operating conditions in which the valve must operate. Some materials are not suited for very high temperature use while others are too dense to be used in conjunction with very extreme valve lift profiles. In previous articles, we have looked mainly at the different classes of material with a view to having the valves made in a certain...