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What is the purpose of double clutching?

What is the purpose of double-clutching in racing?

  • I've heard in numerous places that double clutching is used during racing. To my knowledge, double-clutching is a technique used to synchronize gears in older model trucks. So, ...show more

  • Answer:

    Under normal circumstances, double-clutching is not used any more in racing - it's too slow to shift that way. The only exceptions to this rule is: 1) if you need to shift down to first gear (using an old H-pattern gearbox) - first is hard to engage at speed, and double-clutching makes the shift easier and smoother, and 2) vintage racing, where the cars don't have synchromesh gears. You rarely see double-clutching these days, as most race gearboxes are sequential shift - there is no neutral between second and first to use for the double-clutch.

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Race cars have straight-cut gears which do not try to force themselves apart and out of the case. They need to be double-clutched if they are made without synchros.Helical cut gears and synchros allow transmissions to shift smoother and run quieter,but they add rotating mass, and are less durable which are undesirable qualities in a racing application where noise and harshness are acceptable in the quest for speed and endurance.

kevin k

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