disability light weight clutch pedal

[mike kimmens]

Due to problems with my knee I need to make the clutch pedal in my 1967 MK1 2000 lighter, I'd prefer to do this rather than stick an auto box in it. Although the car is a 1967 MK1 2000 it has been updated/graded to full 2500S spec. Can a remote servo be used with a clutch? Any ideas appreciated

[JohnD]

Or, you could try a smaller bore clutch master cylinder.
The travel will be greater, if your knee will stand that.

JOhn

[mike kimmens]

John, thanks for that idea, I've had a look at cw website and he lists 2 sizes of slave cylinder bore but only one master cylinder cw says 7/8 will give longer travel than 1" so I think I will have a look at what bore slave is already fitted and it might be a simply solution. Won't now if knee can cope until I try it, Spa at end of May so need to sort it before then. Regards Mike

[willows40]

Don't know if it works or not, but remember seeing car sos putting a servo on clutch, think it was a stag to make it lighter

Cheers Andy  

[Nick Jones]

Pretty sure you could use a remote servo.  I've also seen that some relatively modern larger Japanese 4x4 s have servo'd clutch M/Cs which look just like smaller versions of the brake ones.  Certainly Nissan Patrols of 2007/8 vintage have them.

Nick

[nicmk1est]

yeah it was on that daimler v8 2door thing,,no idea what it called

[Pete Lewis]

just google it
there's a few  available

used the wabco ones on trucks
may need small air supply , 12v Tyre inflator may be sufficient

then apart from cyl diameter  ratio changes try a bigger pedal pad  makes a lot of difference   and   cheap

Pete

[Glenn]

Like Andy says, check out Car SOS - it was to the Zodiac they fitted a clutch servo.  Looked simple enough in the show and seemed to do the job nicely.

[nicmk1est]

you are correct glenn,it was the zodiac     vid here,skip to 20.22 ish     https://www.youtube.com/watch?v=QbAURujaQUE

[colmiller]

On the Daimler Dart Car SOS did they also wanted a lighter clutch and on that they swapped out the pressure assembly which had coil springs for one using a diaphragm spring. It surprised me that it would have made any difference. Surely the spring pressure would need to be the same.

[RobPearce]

10362 wrote:

On the Daimler Dart Car SOS did they also wanted a lighter clutch and on that they swapped out the pressure assembly which had coil springs for one using a diaphragm spring. It surprised me that it would have made any difference. Surely the spring pressure would need to be the same.

It makes quite a difference.

The coil spring clutch is linear - the further you compress the springs, the more force it takes. The clutch engaged condition, where the pressure is required to transmit torque, is with the springs minimally compressed. Thus you need to apply more force to disengage the clutch - and hold it disengaged - than is needed to clamp it.

The diaphragm spring is an "up-and-over" device. Once you've pressed it past the knee point, the force required to push it further - and hold it there - is far less.

[colmiller]

Thx. Makes sense to me now.