27 replies to this topic

[croc7]

Had anyone been successful in reducing foot pressure at the clutch pedal? Maybe through the use of a larger master cylinder?

[sonscar]

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

[croc7]

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

Yeah, me too.  I should have phrased it as a master cylinder capable of producing higher pressure.  And if there is one, then is that higher pressure a concern regarding clutch hose, slave cylinder capabilities, etc.

[nicklouse]

 

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

Yeah, me too.  I should have phrased it as a master cylinder capable of producing higher pressure.  And if there is one, then is that higher pressure a concern regarding clutch hose, slave cylinder capabilities, etc.

 

Let’s start at the beginning. 
 

what is the problem you are trying to fix?

 

as changing piston sizes changes other parameters which may not be possible due to outside constraints.

[Spider]

Hey J !

With the pre-verto (which is I'm sure what you have), when the clutch plate, flywheel and backing plate are set up correctly, they aren't too bad, a little heavier than clutches in most other cars, but by no means objectionably so.

 

If this is still heavier than you'd like, you can - with some small extra work - swap over the main body from a Brake Master. The extra work I'm referring to is swinging the Reservoir from the Brake to the Clutch position (the Aussie made cylinders, which are NLA were easy for this, just bolt them in 180⁰ around). All the other components though need to be in good order to ensure you get enough travel out of it all, but it will do it. The Clutch Master is 0.75" dia and the Brake is 0.70", so it will make it a little lighter.

Another option is probably to go to a Verto style Clutch, these have a very light pedal, but IMO, these are not a good arrangement.

[croc7]

 

 

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

Yeah, me too.  I should have phrased it as a master cylinder capable of producing higher pressure.  And if there is one, then is that higher pressure a concern regarding clutch hose, slave cylinder capabilities, etc.

 

Let’s start at the beginning. 
 

what is the problem you are trying to fix?

 

as changing piston sizes changes other parameters which may not be possible due to outside constraints.

The problem isn't mechanical, its bio-mechanical.  My left knee isn't as young as it used to be.

[nicklouse]

 

 

 

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

Yeah, me too.  I should have phrased it as a master cylinder capable of producing higher pressure.  And if there is one, then is that higher pressure a concern regarding clutch hose, slave cylinder capabilities, etc.

 

Let’s start at the beginning. 
 

what is the problem you are trying to fix?

 

as changing piston sizes changes other parameters which may not be possible due to outside constraints.

The problem isn't mechanical, its bio-mechanical.  My left knee isn't as young as it used to be.

 

It still is mechanical as the system is a closed loop. With defined travel requirements. Changing the piston size will change the travel needed at the pedal if you want to keep the travel needed at the slave.

 

hence the question as  you could have been doing something that does not have the restraints that the current set up puts on it.

 

making the MC diameter smaller will reduce the force you need to apply but you will need to move the pedal further as there will be less fluid moved. IIRC most Mini clutch pedal hit the floor anyway. So there is a good chance that you will not disengage the clutch,

 

which set up is it! And is the pressure plate standard?

[panky]

If you could find the room you could fit a brake servo to the clutch system.

[croc7]

 

 
 

 

 

Wouldn't it be smaller master cylinder(I struggle with this sometimes),Steve..

Yeah, me too. I should have phrased it as a master cylinder capable of producing higher pressure. And if there is one, then is that higher pressure a concern regarding clutch hose, slave cylinder capabilities, etc.

Let’s start at the beginning.

what is the problem you are trying to fix?

as changing piston sizes changes other parameters which may not be possible due to outside constraints.

The problem isn't mechanical, its bio-mechanical. My left knee isn't as young as it used to be.

It still is mechanical as the system is a closed loop. With defined travel requirements. Changing the piston size will change the travel needed at the pedal if you want to keep the travel needed at the slave.

hence the question as you could have been doing something that does not have the restraints that the current set up puts on it.

making the MC diameter smaller will reduce the force you need to apply but you will need to move the pedal further as there will be less fluid moved. IIRC most Mini clutch pedal hit the floor anyway. So there is a good chance that you will not disengage the clutch,

which set up is it! And is the pressure plate standard?

 

 

Its a run of the mill pre verto set up with a blue spring. Looks like I’m stuck. Thanks for the thoughts.
J

 

[Andosoft]

Worth watching this if you haven't youtube.com/watch?v=C3c5EcpYiP8 where he goes through setting up the clutch and reducing/optimizing the pressure required to release the clutch.

Edited by Andosoft, 31 March 2022 - 04:16 AM.

[nicklouse]

IIRC the Verto clutch has a lighter pedal. Not sure but I am sure others know.

 

I remember my metro pedal being light.

[mini13]

Ok, I know a bit about this,

 

First off, I think modding the pre-verto setup is probably a no go, as there is not a lot of spare travel, in fact any wear/mis-adjustment can cause issues in that setup anyway.

 

on the verto setup I have successfully lengthened the arm on the wok by roughly 1/3 to get a lighter pedal (this is on an RTS clutch with two springs stacked for a turbo motor)

 

there is a third option, I have heard of people fitting the remote servo as used on cooper's in the clutch line, its supposed to work well, but takes up a fair bit of room.

 

https://www.moss-eur...-servo-kit.html

 

[Ethel]

Metros had a 5/8" master compared to  3/4" on a Mini. I've used one with a Pre-Verto & pre '76 pedal box.

[stuart bowes]

is it not possible to just make the pedal longer with a bit of creative cutting and welding (or just bolting on an extension) 

 

maybe an extra inch or two would help just with the basic added leverage

[coopertaz]

easiest step to go to verto, but get a lightened unit as, in my experience, these have a tendancy to move on crank under heavy use. from memory didn't metro also have a small cylinder inline with slave? never used it threw in bin with mounts.