QUESTION - How do you double clutch a non-syncro transmission?

ANSWER - To double clutch when going from a lower ratio gear to a higher ratio gear:

• Press down on the clutch pedal while taking the other foot off the accelerator pedal.
• move the gear box into neutral
• release the clutch pedal
• press the clutch pedal down a second time.
• move the lever into the next highest gear and release the clutch pedal.
• resume pressure on the accelerator pedal.

To double clutch when going from a higher ratio gear to a lower ratio gear:

• Press down on the clutch pedal while taking the other foot off the accelerator pedal.
• move the gear box into neutral
• release the clutch pedal
• rev the engine briefly
• press the clutch pedal down a second time.
• move the lever into the next lower gear and release the clutch pedal.
• resume pressure on the accelerator pedal.

The object of double clutching is to match the speeds of the various shafts, gears and splines before engaging the next ratio.

On upshifts, disengaging the clutch while the transmission is in neutral slows the input components to match the speed of output components.

On downshifts the engine is revved to speed up the input components to match the speed of the output components.

Experience teaches how high to rev the engine when performing down shifts into non-syncro gears.

The synchromesh mechanism achieves this speed matching by "dragging" the components to a matching speed with the synchronizer rings.

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