Double Clutch - Transformers - was created in 2010.
Do you mean double de-clutching? This is done only with a manual gearbox (transmission). You de-clutch, or depress the pedal to allow a gear change (the clutch engages and disengages the drive). When changing from one gear to another you pass through neutral where you rest the gear change, lift the clutch whilst simultaneously blipping the revs up then depressing the clutch again and engaging the new gear. Usually helpful on boxes without full sincro and not necessary with modern cars
Just push the peddle twice......
Yes you do. Flywheel on the Semi's are very heavy and in order to sync right you have to double clutch.
The clutch on my Honda CG125 lasted 13500 km of heavy every day use. If you do not gear down a lot your clutch will last double that.
Answer Double clutching isn't for driving normal everyday manual shift cars, it's for driving trucks. A truck driver double shifts because the shifter doesn't always go into gear with one simple push of the clutch pedal. If you are a truck driver driving in the lower gears, you have to double clutch when you want to go in the higher gears. Hope this answers your question.
Nope, you don't even have to single clutch... I work with a few people who only touch the clutch when making a full stop. Personally, I think it's hard to do, and I single clutch. If you're ever testing with DOT, you best make sure you're double clutching though, because that's the "correct" way to shift, in their book.
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It,s much less stress on the synchronizer
This is typically done for unsynchronized transmissions. You get up to the RPMs you want to get to, depress the clutch just enough to take the vehicle out of gear, release the clutch, depress it again, go into the next gear, and release the clutch. With an unsychronized transmission, you'll have to time your shifts accordingly.