Re: double clutch

[Mark Denovich <mark@domain.elided>]

I think he means match gear/engine speed perfectly.  If you do it just 
right, the synchros don't have anything to do.

Hell if you do it right you don't even need the clutch.   I used to 
practice this when I was driving for UPS.   The trick was keeping some 
pressure on the gear-shifter, momentarily cutting the throttle, feeling 
for the right moment and snicking it into the next gear.   On my 
sportbike I could do almost full throttle upshifts this way.  They even 
sold ignition interrupters for motorcycle drag racers... it would 
momentarily cut the ignition during an upshift, so you didn't have to 
back off the throttle at all.

	--Mark

Weiss, Jeffrey wrote:

> David gives the short explanation:
>
> > Double clutching helps weak synchronizers, straight cut/
> > racing gears and old non-sychro transmissions engage without
> > crunching. Otherwise you'll have to quickly match gear speed
> > /engine RPM by ear, which takes longer to learn....
>
> "Otherwise"?  I don't see how one is a substitute for the
> other.  You can't match gear speeds with the engine unless you
> double clutch,  so don't you really have to do both?
> --
> jw
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