hi all, can i convert my 81 ke70 from cable to hydraulic clutch, i have already installed ae71 pedal box as i was doing an engine conversion but have hit a brick wall so fitting a 4k with manual gearbox (sourced from 82 ke70) for a bit and not sure if i have to find a cable pedal box now or i can convert to hydraulic. 

any help would be great.

 

I haven't heard of anyone converting a K box to hydraulic, but it should be quite possible if you fabricate a mount for the slave cylinder.

The obvious problem is the cable pulls while the slave cyl pushes, so measure the travel with a cable setup and see if you can find a slave cylinder that travels that far.  Then make a steel frame that bolts onto the side of the box and carries the slave, and fabricate some sort of connection between the slave's rod and the clutch lever's hook.  Finally, get a flexible line made up that is long enough to reach.

The big question is, if you're doing an engine conversion with an AE71 pedal box, why are you using a K box??  The usual path is for 4AGE or 3SGE, and neither use a K box.

 

thanks for the info, i know it don't make sense but i was putting a rotor in the car with celica 5 speed and have changed the pedal box as needed but I've hit a wall pissed the rotor off and going back to 4k for a bit so i was trying to avoid changing pedals again.

I converted my K40 gearbox in my clubman from cable to hydraulic (no room for the standard clutch fork)

I used a second hand Tilton concentric slave cylinder (modded slightly to clear the input shaft) and mounted it to the input shaft seal/clutch fork pivot plate.

 

10 minutes ago, Crashly said:

I converted my K40 gearbox in my clubman from cable to hydraulic (no room for the standard clutch fork)

I used a second hand Tilton concentric slave cylinder (modded slightly to clear the input shaft) and mounted it to the input shaft seal/clutch fork pivot plate.

 

this looks pretty insane, I've  never heard or seen one of them slave cylinders, what i can see is the clutch fork is no longer required. so this just pushes straight onto stock thrust bearing?

No need for a clutch fork, it pushs forwards against the clutch pressure plate. 

The Tilton unit uses its own thrust bearing.

thanks Crashly for the info mate appreciate it, do you know what vehicle that slave cylinder was originally for, i did a bit of a search and  couldnt find anything to suit ke70. this particular unit has the right amount of push and obviously works so i would like to imitate it. are they a universal s/cylinder.

These are designed for custom installs, from memory I used a 3000 series unit.

If you want to use this unit, you will need to slightly increase the centre bore of the base in a lathe and reduce the height of the mounting legs.

Changing the pedal box is probably going to be an easier and cheaper option.

 

1 hour ago, Crashly said:

These are designed for custom installs, from memory I used a 3000 series unit.

If you want to use this unit, you will need to slightly increase the centre bore of the base in a lathe and reduce the height of the mounting legs.

Changing the pedal box is probably going to be an easier and cheaper option.

ok thanks for the info it's much appreciated.

More on the subject of Concentric Slave Cylinder conversions, can be found at this other thread on RollaClub

https://www.rollaclub.com/board/topic/77940-upper-thermostat-housing/#comments