Curved-top tappets

Friday, May 11, 2012
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For those familiar with the design of overhead cam engines, the most common type of cam follower used in bespoke race engines of this type is the solid 'bucket' tappet. These are akin to the flat-faced followers used in pushrod engines, except that t... read more
Tags :  valvetrain

Roller lifters

Thursday, March 29, 2012
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In terms of circuit racing, the pushrod engine is most famously used in NASCAR competition; while some other race series allow all kinds of valve actuation, NASCAR mandates cam-in-block and overhead valve engine architecture. One aspect of valvetrain... read more
Tags :  valvetrain

Exhaust valve materials

Thursday, March 29, 2012
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The poppet valves of a four-stroke engine have an arduous life, and the current design trend of engine downsizing in production vehicles and several race series is likely to make their life more difficult still. With downsizing comes boosting, mainly... read more
Tags :  valvetrain

The importance of natural frequencies

Thursday, February 09, 2012
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Some of the recent articles concerning pushrod valvetrains have tried to explain the importance of valvetrain stiffness. The advent of the Spintron tester, and its widespread deployment in the r&d shops of engine builders, has given engineers a b... read more
Tags :  valvetrain

Aluminium as a valve material?

Thursday, February 09, 2012
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The poppet valve is almost universally used in all forms of transport powered by an internal combustion engine. Motorsport has always had a buoyant two-stroke sector in the motorcycle arena, although this is on the wane now with Grand Prix motorcycle... read more
Tags :  valvetrain

Rocker stands

Thursday, December 15, 2011
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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 mea... read more
Tags :  valvetrain

Choosing valve materials

Thursday, December 15, 2011
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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 t... read more
Tags :  valvetrain
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