TC's and manual trans (was: Re: Smooth strategy)

[BUTLER, Tom]

> Don't recall whatinell they called it, but for a while Porsche used a
> fluid
> coupling AND a vacuum operated clutch (which was triggered by a
> microswitch
> on the manual shift lever) in front of a manual tranny in the 911's. The
> fluid coupling ran in engine oil, IIRC. (A fluid coupling does not
> multiply
> torque, has only two elements, called pump and turbine.)
> 
> Easiest way to think of how one works (at least for me) is to think of a
> centrifugal pump driving a centrifugal turbine--and then eliminate the two
> housings, and all the attendant weight and inefficiencies, by just
> wrapping
> the impeller and turbine wheels into a taurus shape, and mounting them
> face
> to face.
> 
> Regards, Greg
> 
	[BUTLER, Tom]  
	These were also fairly common in VW's