DoubleShufffle/Doubling the Clutch.

You want to see some fancy footwork , watch the inset in the top left corner,



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Whch light truck requires this technique? The ones I have driven were like normal cars.
That technique is like the one you use on a roadranger gearbox when you are going for your lic

Hey Pauper unless you are driving a 23 speed road ranger split gear box, you will not need to worry to much, as today's 4wd have synchromesh gear boxes, no need to double clutch.

OHH today's technology.

Brought up on old 'crash boxes' and still D/Clutch as a habit.

Funnily, been told by a couple of mechanics, its still worth doing on modern boxes as it save wear on syncro's.


Cheers.....Lionel.

G/day , Theres a lot out there that change gears without the clutch, HeavyVehicles with the roadranger Boxes, all about the right revs and feel.



Cheers Axle.

the way the V8 racers change gear it looks like thay are the same as a motor bike.
That is when they change up they just keep clicking down on the gears and the electronics cuts the motor.
When I used to ride large bore bikes we called it "racing change" just rev the ring out of the bike and just blip the throttle to get it to go into gear without using the clutch.
Couldn't do it changing down though and had to use the clutch and five it a bit of a rev to get it to change down smoothly.

Honky

Hi all,

Synchromesh gear boxes were designed to make life easy by only having to press the clutch once to change gear especially in trucks and the like. Saves damage and excessive wear to the components as well.

The V8 Supercars all run a similar type of g/box as a motor bike ie a constant mesh box in which you move the gear lever one way to change up and the other way to change down as mentioned before. The electronics that they have in the r/cars these days to monitor revs, cut the ignition when gear changing etc etc are more powerful than the computer you are reading this on now.

Changing gears without using the clutch is a useful skill to have but, even with Roadranger and Spicer boxes in the big vehicles, it is not recommended as not very many people have the skill and knowledge to get it right. I have seen the results of buggered gear changes eg twisted counter-shafts, chipped gears and the centres torn out of clutches.

SB

From Wikapedia:-
A sequential manual transmission (or sequential manual gearbox) is a type of manual transmission used on motorcycles and high-performance cars for auto racing, where gears are selected in order, and direct access to specific gears is not possible.

With traditional manual transmissions, the driver can move from any gear, to any gear, by moving the shifter to the appropriate position. This type of transmission is often referred to as a H-pattern because of the path that the shift lever takes as it selects the various gears. A clutch must be disengaged before the new gear is selected, to disengage the running engine from the transmission, thus stopping all torque transfer. In auto racing, this process is slow and prone to human error; hence the development of the sequential transmission. A true sequential transmission will very often use dog clutch engagement rather than the more usual syncromesh as fitted to a normal H-pattern road car gearbox. Engagement using dogs only requires a very brief interruption of engine torque to complete a shift into any adjacent gear. This allows shifting between gears without the use of the clutch. The clutch would normally be used only for standing starts

CRIKEY. Thankyou all for your interesting and informative responses. My definition of a light truck in the context of this thread would be heaviest tray top you could drive legally with a car drivers license. Not everyone drives a modern 4x4 and learning to slow down using gears can save your brakes. May even help you get out of angel gear. What is angel gear you ask. Angel gear is being caught in neutral on a steep decline and you are having trouble selecting the lower gear because your road speed has increased due to brake fade from overheating and you need to use gears to slow down. Regards, Pauper.

I bought my first 4wd in 1979 - a 2A LandRover. No synchro on first or second. In the Sydney peak hour traffic, my wife soon learned how to double shuffle in both directions. Its a good skill.

Here is some double clutching
Shane

Sounds like someone just got their MR license??

I remember many years ago wotking around Moree with a harvesting contractor who had an old Mack, I think it was, with a joey box.
Now there's a skill driving one of those that would test most of the young ones today.