Valvetrain Channel

Some design considerations for timing gears

Monday, November 10, 2014
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Although the North American passenger car market still uses overhead valve (pushrod) valvetrains, they are very much out of vogue in the rest of the world. While big-capacity, lazy, low-revving engines are common in the US, where gasoline is relative... read more

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Powder-metal valve seats

Tuesday, September 30, 2014
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Modern race engines place very harsh demands on valve seats for a number of reasons, all of which are concerned with extracting the absolute maximum from the engine. In comparison to a passenger car engine, as an example, racing seats are expected to... read more

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Combined valve locks and lash caps

Monday, August 18, 2014
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Some engine components are generally ‘out of the limelight’ as far as coverage in motorsport publications are concerned. Race Engine Technology magazine and these RET-Monitor articles tend to cover most items in detail, so you can find ar... read more

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Avoiding damaging spring vibration

Wednesday, July 09, 2014
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In race engines that contain them, the valve spring is the most highly stressed component. In the best springs, the materials, heat treatments, hardening processes, manufacturing techniques and surface treatments combine to allow them to operate at i... read more

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Pushrods

Thursday, May 08, 2014
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 Pushrod engines are ‘old hat’, an anachronism in these modern times, but while the rest of the world has moved on and adopted the overhead camshaft, the users of big V8 engines have remained loyal to the old tech. That is probably a... read more

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Lifters

Thursday, March 27, 2014
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The overhead valvetrain is no longer widely used in much of the world, although it retains a firm grip on the North American market and engines based on it also appeal to the Australian motorist. Perhaps the advantage of having historically had low f... read more

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Collets - surface treatments and coatings

Wednesday, February 19, 2014
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Valve collets (also known as valve keepers, valve cotters or valve locks) are not something that engine tuners often turn to in order to make their engines perform better or improve reliability. While collets for the general automotive market are ver... read more

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Design of spring retainers

Wednesday, January 08, 2014
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Valvetrains are often the key to improving engine performance. Given a free hand, most engine development engineers will strive for ever higher engine speeds as a route to increased power output, if friction can be prevented from overcoming the extra... read more

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Surface treatments for timing gears

Monday, December 02, 2013
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With the dominance of the four-stroke engine in both the automotive passenger car market and most types of motorsport, there are plenty of opportunities for suppliers of timing gears to improve either on standard equipment or to optimise these compon... read more

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Heat transfer through valve guides

Monday, October 07, 2013
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In most race engines, much of the heat transfer from the valve to the cooling medium – whether it be oil, water or air – is via the valve seat insert, then into the head and eventually to a fluid that will reject the heat to atmosphere. ... read more

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