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Re: What is double clutching and is it a good idea?
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Thu, 11 Jan 2001 22:37:19 Share Post by Email
In Reply to: What is double clutching and is it a good idea?, minda, Thu, 11 Jan 2001 21:59:45
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You're close on double clutching, but not quite. What you do is push in the clutch, shift to neutral, let out the clutch, THEN hit the gas to bring the engine revs to where they would be in your new gear, push in the clutch, and shift into the new gear.

Example: You are in third gear and want to shift to second. In third gear the engine is running at 2000 rpm (say 35 rpm, just guessing), and at whatever road speed you're at would be 3000 rpm in second. Shift to neutral, rev to 3000, push the clutch back in, and while holding 3000 rpm, slip the gear shift to second. Let out the clutch.

Sound complicated? You bet. It takes a lot of practise. The whole idea is to get all of the gears turning at the right speed so the teeth mesh nicely. Double clutching comes from the old days when transmissions didn't have a nice modern invention called synchonizers (aka synchros). They speed up or slow down the various shafts and gears in the transmission so gears mesh nicely. Nowdays the only gearboxes without synchros are some race car transmissions.

Is it hard to learn? Yes and no, depends on how coordinated you are. I've heard race instructors call learning it 'making metal' because of the nasty grinding you hear.

Does it extend the life of the gearbox? Not really. The synchros on most cars are pretty stout. You don't hear about them wearing out very often. What wears out synchros? Slamming the car into gears, like cruising along at 45 in third and slamming it into second - something where the synchros need to make big speed adjustments. Shift smoothly, don't skip gears (like jump from second to fourth), and don't slam the gearbox around, and you'll never wear a synchro.
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