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
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