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Roller lifters

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In terms of circuit racing, the pushrod engine is most famously used in NASCAR competition; while some other race series allow all kinds of valve actuation, NASCAR mandates cam-in-block and overhead valve engine architecture. One aspect of valvetrain development that affects engine design and development engineers all over the world is valve lift profiles, and there has been a strong tendency over the years to design cam profiles that are more 'aggressive' in terms of using ever...

Bad valve spring wire can ruin a racer's title hopes

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In the Pro Stock Motorcycle category of NHRA Full Throttle Drag Racing Series, there are three engines currently in the game. Only the two-rider Vance & Hines team uses the Harley-Davidson Screamin' Eagle, while the balance of the field is split between the Buell engines, supplied by S&S Racing, and Suzuki engines, furnished by Vance & Hines' workshops. While Harley-Davidson puts a good deal of support behind its factory team, and S&S has managed to get NHRA to open...

Exhaust valve materials

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The poppet valves of a four-stroke engine have an arduous life, and the current design trend of engine downsizing in production vehicles and several race series is likely to make their life more difficult still. With downsizing comes boosting, mainly in the form of turbocharging; any form of boosting leads to increased temperatures and pressures in the combustion chamber, and much higher exhaust gas temperatures. The exhaust valve, which already has much higher temperatures to deal with...

Rapid prototyping

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Until relatively recently, the so-called 'rapid prototype' manufacturing methods were restricted to polymers and some other fairly 'flaky' materials - at least in terms of commercial availability. After the initial polymer materials (some of which are excellent and can be used perfectly well as test and race parts for chassis and engine use) some metal materials became available, though nothing which we might have considered useful for race engine components. In the past few...

Flywheel design

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With all the press coverage of Formula One KERS systems, you might be forgiven for thinking that all racing hybrid systems are of the 'conventional' electric-hybrid type. This is far from the case, and if you look a little deeper, there are a number of systems that are based on mechanical technology rather than electric machines, power electronics and batteries If you want to see real diversity of technology in terms of energy recovery then you need look no further than sportscar...
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