Preventing roller lifters from rotating

Thursday, July 04, 2013
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An important element in improving engine performance is the optimisation of the valve lift curve to maximise the mass of trapped charge in the engine. In an engine with an overhead valve (pushrod) valvetrain, the change from flat-faced lifters (also ... read more
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Choices for single-piece pushrods

Thursday, May 16, 2013
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If we look at the types of engines used in various car racing series worldwide, there is a very definite split between the US and elsewhere. The US has a hugely successful racing structure that predominantly uses pushrod (overhead valve/OHV) engines.... read more
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Valve springs – surface treatments

Friday, April 05, 2013
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Valve springs are often the most highly stressed parts in any race engine. While some types of race engine don’t have valve springs – two-stroke, Wankel, four-stroke desmodromic or four-stroke with pneumatic valve return – most of t... read more
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Collets

Thursday, February 21, 2013
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The function of the valvetrain in any engine is critical to its operation. In a race engine it is often an area of constant development; with engineers striving continually to improve the engine’s breathing characteristics or working towards hi... read more
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Spring Retainers

Thursday, January 03, 2013
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The development of a race engine is most often concerned with maximising efficiency. An integral part of many engine development projects is improved ‘breathing’, and in addition to developing the inlet system, combustion chamber and exha... read more
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Timing gears

Thursday, November 08, 2012
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If we look at a production engine from a roadcar, the chances are high that the cams will be driven by a toothed belt, whether the engine is overhead camshaft or overhead valve (pushrod). If we look at an engine from a motorcycle, the camshaft drive ... read more
Tags :  valvetrain

Variations in lash cap design

Monday, August 13, 2012
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Lash caps (also widely known as tappet shims) are probably the most innocuous of valvetrain components. They are inherently stiff and, owing to their size, they weigh very little. There is therefore no real incentive to change their design, because a... read more
Tags :  valvetrain

The effect of valve size

Tuesday, July 03, 2012
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There can be little doubt that the flow bench is a useful piece of equipment. They can be found everywhere, from the workshops of those who tinker with engines for a hobby to some of the top engine manufacturers in the world. Those with large financi... read more
Tags :  valvetrain
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