Triple springs for drag boats

Monday, July 04, 2011
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Who could imagine using the same set of valve springs for more than two years in a nitrous-infused 565 cu in V8 engine that competes in the quarter-mile on water? Wayne Gaskamp has been able to accomplish just that with his 1800-plus hp engine that ... read more
Tags :  valvetrain

Stem stiffness and seating

Monday, July 04, 2011
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In developing a race engine it is common to evolve valve-lift profiles constantly to improve the 'breathing' of the engine. The aim is to increase volumetric efficiency or, more precisely, to increased the trapped mass of fresh, unburned charge. In t... read more
Tags :  valvetrain

Rockers - material choices

Thursday, May 12, 2011
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Rockers are a critical element in the valvetrain of any overhead-cam engine, and so we should not be surprised to find that their development continues to be the subject of much activity in racing circles. Much of the racing in the US, for example - ... read more
Tags :  valvetrain

Methods of closing hollow valves

Thursday, May 12, 2011
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In the recent Race Engine Technology article on valves, there was some discussion of the merits of hollow valves, and indeed the subject has been covered by Anne Proffit and I in these Monitor articles in the past. We should briefly restate here the... read more
Tags :  valvetrain

Lifters - flat versus roller

Thursday, March 31, 2011
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In the RET magazine Focus article on pushrod valvetrains (issue 45, March/April 2010), we looked at the effect of flat tappets in limiting the lift velocity of a direct-acting cam on a lifter. The limitation is exactly the same as that in direct-acti... read more
Tags :  valvetrain

Does size matter?

Thursday, March 31, 2011
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How much valve spring does an engine tuner need to propel 8000 hp down a 1000 ft dragstrip? Is it best to use titanium, or is steel sufficient? And are two springs best, or should there be three? For Bob Vandergriff Jr's C&J Energy Services Nati... read more
Tags :  valvetrain

Heat transfer

Thursday, March 31, 2011
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With the dominance of four-stroke engines in racing, and the near-monopoly that poppet valves have in such engines, it is little surprise that these parts have become well developed. While most racing is still based on naturally aspirated engines, it... read more
Tags :  valvetrain

Pushrods - one-piece or three-piece?

Wednesday, February 16, 2011
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When we look at the offerings from the major pushrod manufacturers, we see that there are many who offer assembled pushrods made from multiple pieces - usually three - with a typical race pushrod consisting of a long, slender central section combined... read more
Tags :  valvetrain

Small springs that do the job

Wednesday, February 16, 2011
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Working with a production engine and increasing the stroke on it can often lead to problems in the valvetrain. That hasn't been the case for Rhys Millen Motorsports (RMR), who decided - with four months to spare - that it would build up a Hyundai Lam... read more
Tags :  valvetrain
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