what is double clutching?

Question

when driving a car, what is double clutching

Answer 1

imagine your thrashing your car in first gear then you change to second gear and release the clutch, if the car dont pick up as quick as you would like it to then keep your foot on the throttle and quickly press and release the clutch, tis allows the revs to build up and in theory give you a burst of energy to your motor.
wouldnt recommend doing it to often though!

Answer 2

WHOA! I can not believe how many people have such a totally wrong Idea about this. Double clutching as a few people have said above is when you are going down gears. It is also known as heel and toeing. The idea is to match the revs of the crankshaft with the speed of the gear you are shifting down to. Despite the existance of Synchromesh in gear boxes it still serves a purpose. If you double clutch you get rid of the engine breaking. What a lot of people dont know is if they shift down too high in the rev range it can cause the drive wheels of the car to lock for a split second. This places very large stresses on your drivetrain and in rear wheel drive cause the back of the car to come around. This is known as shift lock drifting when provoked on purpose. Double clutching negates this.

Additionally don't even "think" about doing things like "shifting into Neutral and revving it between gears" You could damage or destroy many things such as clutch, gearbox or your differential

Answer 3

Double de - clutching is something we dont have to do any more, generally, unless driving a very old (probably pre 1975) car or an HGV. It's where you have to keep the engine running at just the right speed whilst the clutch is depressed during gearchanges (tricky to do) and was solved by the introduction of synchromesh. Also requires neutral to be selected between gears.

Answer 4

As every one says "it using the clutch twice to change gear, the reason for this is on older cars the gearbox was not syncromeshed and made changing gear easier and without the crunching of gears. Hope that helps

Answer 5

The double declutch (or, more simply, double clutch) is a driving technique that is somewhat harder to describe than to learn how to do. At one time, it was a very common practice, because gearboxes had no synchronizers. Now it has largely fallen into disuse, except by drivers of large trucks, who still have to deal with the older, unsynchronized, type of gearbox.

Answer 6

Double declutching is the act of revving the engine slightly in neutral after releasing the pedal usually during gearing down.

This allows the cogs within the gearbox to spin at the same speed or sub-speed.Thus allowing the teeth to mesh and the gear to be engaged.

This method was always used in heavy vehicles and in old cars with full "crash" gearboxes.
It is still used in some modern trucks despite full synchromesh gears.

Please disregard most other answers as they are totally or partially incorrect.

Answer 7

EL1 is right it was used before gearboxes got syncromesh, which means all the cogs etc have to be spinning at the right speed for the next gear to be selected, so you had to put it in neutral and rev the engine a bit before selecting the next one, or the gears would crunch madly, probably did anyway! it was tricky but you got used to it, however most of the cars back then only had three forward gears, and maybe a top speed of about 50 mph, you find it on vintage cars and pre 50's models, after that syncromesh was the standard.

Answer 8

Putting it into neutral every time you change gear. So it's from first into neutral, foot off clutch, foot on clutch into second, back to neutral, off clutch, on clutch into third etc etc. It's just for older cars and serves no purpose nowadays.

Answer 9

Then shifting gears, pressing in the clutch all the way, letting it out a bit, pressing it in all the way again, shifting gears, then letting the clutch out.

This was required a long time ago before synchronized gears in the transmission. It was needed to align the gears to allow them to engage.

All new cars and trucks have synchronized gears in the transmission, making double clutching unnecessary.

Answer 10

Double clutching is simply pushing the clutch in twice quickly while shifting gears. This was required in heavy trucks and in some early cars (1920-1930) when shifting gears.

Answer 11

When you're driving along in a car and you go to change gear, you move it from one gear and put it into neutral, you then lift the clutch up and then put it down again and place into the next gear.