Managing torsion vibration

Monday, November 10, 2014
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While much has been written about the design of camshaft profiles and how to install and time them in an engine, comparatively few details are available about the actual dynamics in the valvetrain system due to the torsional vibrations induced. Much... read more
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Limits to cam timing

Tuesday, September 30, 2014
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In anything but perhaps the most simple of designs the complete camshaft profile cannot be described by a single mathematical expression. Thus, when designing an engine camshaft, the profile will consist of a number of segments described mathematical... read more
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Valve overlap

Monday, August 18, 2014
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I can’t remember precisely when I first saw an engine camshaft or heard the word ‘overlap’, but I can only assume it must have been while I was still in short trousers. I do remember though my father taking the engine out of our car... read more
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Slip sliding away

Wednesday, July 09, 2014
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Friction in an engine means different things to different people. To some it equates to lost power; to others it is lost fuel economy, while to the environmentally aware it represents increased engine emissions, and so faced with these it is little w... read more
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Thumpety-thump

Thursday, May 08, 2014
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Never underestimate the power of nostalgia. For example, the quality of the exhaust noise of a performance car can make all the difference to the enjoyable experience of owning and driving a vehicle, particularly if that vehicle is of a certain age. ... read more
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Multi-profile camshafts

Thursday, March 27, 2014
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The most widely used term in the 21st century automotive world is surely the verb ‘to optimise’. Meaning “to make the best or most effective use of a situation or resource”, in the modern world and with so many variables, engi... read more
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Fishy tales?

Wednesday, February 19, 2014
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I was asked a question the other day that, for a moment, simply floored me. Strolling around an exhibition, my friend and I were talking about the stand we had just visited and the company’s claim that its camshafts were being ground to an accu... read more
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Good vibrations

Wednesday, January 08, 2014
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Readers may well be familiar with the concept of torsional vibration in an engine crankshaft. The situation where the intermittent torques fed into the crankshaft by the successive firing of the cylinders induces cyclical strain within the shaft &nda... read more
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Friction

Monday, December 02, 2013
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While the friction in the valvetrain may not be particularly high, is it not insignificant. And even assuming a suitable motored rig can be developed, understanding the output data can bring considerable challenges. Indeed, my own attempts to measure... read more
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The camless engine (2)

Monday, October 07, 2013
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The demise of the camshaft has been predicted for many years. Optimised over a narrow window of engine operating range, in one way the camshaft can be used to enhance engine performance, but in others it can also limit it. So when optimised at one pa... read more
Tags :  camshafts
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