Hydraulic tappets

Wednesday, February 16, 2011
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In the OE roadcar business, where noise and cost of ownership are major barriers to many prospective buyers, the hydraulic tappet has much to recommend it. But in the world of motorsports, where lightweight and efficient valvetrains are most desirabl... read more
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The domed tappet

Thursday, December 16, 2010
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For anyone starting out on a clean-sheet engine design it is always worth remembering the notice at the entrance to the Sahara desert. The notice, or so I am reliably informed, says something like, "Choose your rut very carefully…. you will be... read more
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Split cams

Wednesday, November 10, 2010
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A few months ago, in May I believe, we looked at a variable duration cam made in two pieces. While this was a novel approach to optimising the airflow into an engine over a range of conditions, reader Reine Gustafson of AGAP in Sweden contacted me re... read more
Tags :  camshafts

Hertzian stresses

Tuesday, September 28, 2010
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The surface of a camshaft or its associated follower can fail in a number of ways. Adhesive wear leading to abrasive wear, and corrosive wear, are perhaps the most common but another type of wear - surface fatigue - is sometimes perhaps harder to und... read more
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Camshaft surface finish

Tuesday, August 17, 2010
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The complex interaction of components that represents the valvetrain operates in some of the most difficult tribological circumstances. With rapid changes in instantaneous direction between adjacent parts, and high contact stresses, the challenge of ... read more
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Machine backlash

Friday, July 02, 2010
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One of the biggest issues with any machine tool, camshaft grinders included, is that of axis backlash. Defined as the loss of motion when the machine's axis, either rotational or linear, reverses, it can have a major influence on the precision of the... read more
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Variable Duration Camshafts

Thursday, May 13, 2010
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Given enough time in engine research and development, only someone who is very blinkered could say they've never come across something a bit, shall we say, unusual. Devices to increase fuel economy substantially tend to be the norm here. Now and agai... read more
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Cam grinding the CNC way

Tuesday, March 30, 2010
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If you talk to anyone in the camshaft manufacturing business, it isn't very long before the name of Landis crops up. Old timers might reflect fondly on such machines as the Berco RAC1500 cam grinder - "The best manual cam grinder in the business" or ... read more
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Friction and the camshaft

Tuesday, February 16, 2010
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Perhaps the most noticeable trend in lubricant technology over the last 30 years or so is the movement towards lower viscosity oils. The relentless drive for greater efficiency and hence higher power has led to developments where in the past claims o... read more
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Camshaft duration

Thursday, January 21, 2010
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Invariably measured in crankshaft degrees, the duration of any camshaft is generally accepted to be the number of degrees the valve is lifted off its seat to the instant that it shuts again. Ideally it should open instantaneously to its maximum lift ... read more
Tags :  camshafts
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