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Archive

Do It Yourself?

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Among those people who start out as amateur racers, some will develop a role as an engineer and learn to understand the shortcomings of their production engines in the quest for more horsepower. Of those people, most will choose not to increase horsepower further, but instead focus on other areas of improvement. This could be on the vehicle itself or on using a stronger engine. A few people though will not want to accept horsepower limits, and will choose to develop their own engine. Since...

NASCAR

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In the previous article on NASCAR exhausts 12 months ago, the subject of materials was discussed without addressing the design of the exhaust system itself. The NASCAR regulations offer very specific guidance to the teams about the design and configuration of the exhaust system. The exit of the exhaust at the sides of the race car are of particular interest. The perimeter of any pipe in the exhaust is mandated to be 13.25 in (336.5 mm), but at the exit of the system, which in NASCAR is...

Torque tensioning

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The proper pre-loading of cyclically stressed fasteners is crucial to their performance. By pre-load, I mean the tension applied to a fastener through tightening before any service loads are applied. If we are to optimise the design of the fastener for minimum mass, this is an especially important point. If the load is too great, we will overload the fastener or the joint; if it is too little, we may fail the joint through separation. Of course, in optimising the design of any given...

The Formula One gearbox lube

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If the lubricant for a Formula One engine poses one set of challenges then that needed in its gearbox creates some that are wholly different. While the internals of a Formula One V8 engine are familiar, if slightly smaller than many may be used to, those of the gearbox are more akin to the movement of a Swiss watch. With gear widths sometimes of the order of 4-5 mm, and slipping in and out of use seamlessly, the analogy is reasonably close. But whereas a watch simply and relentlessly marks...

Wet sumps

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Though rare in most competition cars, wet sumps are still found in race series as diverse as touring cars and drag racers. Each of these places different demands on the lubrication system, with engineers trying to strike a balance between ensuring sufficient oil supply without increasing the losses due to 'windage' effects (the parasitic losses caused by friction between the oil and rotating components). Here I want to investigate some of the methods used by drag racers to circumvent...
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