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Before the introduction of transmission synchronizers in 1927, [2] double clutching was a technique required to prevent damage to an automobile's gearing during shifts. Due to the difficulty and most often unnecessary redundancy involved in the technique, coupled with the advent of synchronized gearing systems, it has largely fallen into disuse in light vehicles.
A dual-clutch transmission (DCT) (sometimes referred to as a twin-clutch transmission) is a type of multi-speed vehicle transmission system, that uses two separate clutches for odd and even gear sets. [1] The design is often similar to two separate manual transmissions with their respective clutches contained within one housing, and working as ...
The Ford unit is a six-speed with one clutch acting on reverse, first, third, and fifth gears, and the other used for second, fourth, sixth gears. As the first gear is engaged, the 2-4-6 clutch is disengaged and the second gear cogs are engaged. At the appropriate time, the R-1-3-5 clutch is disengaged and the 2-4-6 clutch is engaged.
If you have the car in gear but the clutch pressed, then the idler is spinning with the wheels. If you don't double clutch, the synchros get that idler spinning the right speed as you throw the shift lever. With double clutching, the idea is to use the engine to do the synchros' job, so you don't have to wait for them to do their thing.
Double clutch, a baseball term for a fielder drawing his arm back twice before throwing; Double clutch (technique), a method of driving that involves pressing and releasing the clutch twice per shift; Double-clutch transmission, a type of transmission that has two separate clutches; Double-clutching (zoology), when an oviparous animal lays two ...
Float shifting can reduce clutch wear because it is used so much less (only for starting from a standstill). Conversely, improper engagement of a gear (when the engine and transmission speeds aren't matched) can cause wear on the synchros and lockouts, and damage the gears by physically grinding them together due to a difference in speed.
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Each of the Red Jammers built for Glacier accommodated seventeen passengers on four four-abreast bench seats (plus one in front, next to the driver), with five doors on the right-hand (curb) side of the vehicle for passengers and one door on the left for the driver; there were four forward and one reverse speeds that required double-clutching ...