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Valve spring life and reliability are key

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Starting the NHRA Full Throttle Drag Racing Series Pro Stock season with a brand new Ford engine and car this year, veteran driver/tuner Larry Morgan faced many challenges. It's been a trial-and-error situation for the Ohio-based entrant, particularly in the area of valve springs. "I've been using PSI springs for over a year and I have to give those guys, particularly Larry and Steve, a lot of credit. They want to make the valve springs fit our engines and that is good; they...

Valve Materials for Extreme Applications (2)

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In the last article, the author looked briefly at the kinds of materials that we might use for high specific output applications such as supercharged or turbocharged engines. In the article we mentioned a couple of the popular 'superalloys' which are used for poppet valves, namely 'Nimonic' and 'Inconel' alloys. Although not as widely used as the Nimonic materials, Inconel is used in the same sorts of applications, and Wayne Ward recently discussed its use as a valve...

Pushrod clearances count

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Toyota Racing Development (TRD) of Costa Mesa, California maintains a long-term relationship with pushrod manufacturer Trend Performance of Warren, Michigan. "We've worked with them on many other projects as well as the NASCAR Sprint Cup developments," notes David Currier, vice president of engine engineering at TRD. Although the service life of intake and exhaust pushrods is, conceivably, longer than the 700 miles that make up each Sprint Cup race weekend, TRD elects to...

There's plenty of R&D to Toyota Racing Development's valve springs

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As the newest player in NASCAR's Sprint Cup arena, Toyota Racing Development (TRD) in Costa Mesa, California is playing catch-up to manufacturers that have been in the sport for many, many years. According to David Currier, vice president of engine engineering for TRD, his company prefers to use multiple sources for its double-spring valve springs. "Our biggest challenge with valve springs is making them survive with more lift and extra cam work, trying to make them survive. We...

Materials for extreme applications

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In a previous RET Monitor articles, we have looked at a couple of valve materials, namely titanium and titanium aluminide. The chief advantage of these materials is their low density which has obvious appeal when trying to keep control of valves at increasing engine speeds. Titanium aluminide, besides being possessed of even lower density than titanium has the additional advantage of increased stiffness, making it an excellent choice for poppet valves.In this article we shall begin to look...