Clutch servo or automatic box conversion?

[BrianC]

We had a TR6 owner at our local group meeting today who has a problem operating the clutch on his TR6 due to an accident which left him with a weak left leg. He has a TR7 Automatic which is no problem, but he does not want to give up the TR6. Currently it has the largest (3.5?) servo fitted to the clutch circuit but this is not helping a great deal. One of our group TR6 experts suggested that with the PI system there is not enough pressure (or vacuum?) to make maximum use of the clutch servo

 

Options suggested so far:

1. Conversion from PI to carbs
   It would be a shame to remove a perfectly working PI system and also lose originality, but would this work and which carb configuration would be best to improve servo operation without severely impacting performance on the road.
   
2. Convert gearbox to automatic.
   I believe a number of members have done this. I seem to recall that there was someone at a couple of recent IWEs who can supply and/or fit a complete conversion kit but unfortuantely I can't find my collection of old programmes which would probably contain his contact details.

Way beyond personal technical expertise, so if anyone can suggest solutions/sources I would be happy to pass them on.

[i have included this in the general topic as I suspect similar problems affect other models]

[Rodbr]

In this instance I would look at the type clutch used on the Works Audi quatro. There was a button on the gear lever which operated a push/pull valve that operated the pedal lightning fast or possibly a hydraulic clutch release.

something like this;

http://www.demon-tweeks.co.uk/motorsport/hydraulic-release-bearings/alcon-hydraulic-release-bearings

 

much cheaper option than autobox perhaps

[RogerH]

Hi Brian,

it is a shame that the servo and PI are not happy together. Do the brakes/servo work OK!!!

 

I wouldn't worry about originality when changing to carbs if the other option is auto.

The E-type did very nicely on triple SU's and Reg Boulder in leicester group has triple SU's on his TR5 and it goes verily swiftish.

 

Have you considered the concentric servo as used on modern cars - Racterations do a very nice kit.

(oops - just seen Rod's link -- do they really measure torque in mm)

 

Roger

Edited August 3, 2014 by RogerH

[TR NIALL]

Brian,there are several different types of Clutches to be had,get on to one of the Mobility/Disability Company's that Specialise in those type of things,there may also be a grant available.

The Servo type Clutches operate off of their own Servo and there is also an Electronic one available.

Edited August 3, 2014 by TR NIALL

[Lebro]

Personaly I would opt for the conversion to auto box, the clutch option may only provide a short term fix, as the "weak left leg" may in time get weaker.

 

I (stupidly) converted a 2.5PI to twin carbs many years ago, & it always had trouble starting. On selling it I put it back to PI, & it ran (& started) so much better after that !!

 

Bob.

[oldtuckunder]

If getting better servo pressure would solve the problem, take a look at a number of modern diesel vehicles that have a servo pump mounted on the back of the alternator, as they have a similar problem to the PI.

[RogerH]

Hi Brian,

I have just got my gearbox/OD installed and running.

I fitted a laycock cover (pressure plate) and it is unbelievably light to operate.

 

Try and get your chum one of these.

 

Roger