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The modern racing car gearbox

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It can be sobering to sit back and consider what we ask of a racing car gearbox when we require it to perform a structural role as well as functioning as a change speed box... Generally the loads that we will ask it to absorb are a significant proportion of, or even a multiple of all up vehicle weight, and they will act in a variety of directions and combinations. First, if it is to do its job of providing the rearmost section of chassis, we ask it to take the same torsional loading as the...

Revamping the NMT

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Until relatively recently it has been acceptable to keep racing gearboxes relatively simple and add ancillary systems externally. But space inside a racecar is at an ever-greater premium, mainly due to the overriding demands of aerodynamics squeezing the internal volume in pursuit of better airflow. It was once perfectly acceptable for oil pumps and filters to be mounted in the lines to the gearbox oil cooler. But now these things are an unwelcome accessory and racecar designers want to...

Back Torque Limiters

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Back Torque Limiters - what are they and why would you possibly need one?More commonly known as slipper clutches the back torque limiter has been one of the major growth businesses in motorcycling during the last few years.Its all about grip and smoothness. Motorcycles have tiny tyre contact patches compared to cars and the racers that can manage that contact patch and maximise the grip available will be the winners.. A back torque limiter is a clutch that deliberately slips in a smooth...
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