Clutch choices, and Release Bearing and Fork Woes

[chuffer]

Re clutch-plates, puzzled by the "23-spline" referred to somewhere here ? Erreur de frappe or correct

Correct for UK-sourced T5s - Cosworths, TVRs, etc. Got my clutch plate from Watjag, box from Elite. Bootiful.

[PeterCrespin]

"For similar hydraulic ratios, i.e. unchanged master - slave, a lighter pedal equals less effort on the thrust bearing and less wear on the crank thrust washer.

Reductio ad Absurdam is - as usual - the best guide : a clutch with no springs equals no effort at the pedal."


Hmm, at the risk of 'doing a Hugo' , let me try it another way...

Let's say a given clutch requires X force on the release bearing to lift the pressure plate off the friction plate. Whether you change the master/slave ratio, swap to cable, or mess with the release fork length or clutch pedal matters nothing, in so far as that same clutch will still need X force to release. Sure, the amount of operator legwork can be varied - and with it the forces acting on the clutch pedal pad or pivot, but if the clutch hasn't changed, so neither has the value of X at the release bearing and therefore the force acting on the thrust washer at main bearing #4. It may feel lighter or heavier but if the clutch spring is unchanged so is the axial pressure and washer wear.

I can't remember who said what but yes, I'm sure we're all agreed if you change the pressure plate all bets are off. Oh, er, that's where we came in isn't it? Sorry . "I'll get me coat.."

[Series1 Stu]

Very well put.

[rfs1957]

Hey Peter Crespin, are you still outside with your coat ? Please come back inside.

Starting back on 4-wheels, after an intensive spring/summer of 2-wheeled spannering and Isle of Man, now looking again at the clutch business.

Everyone referrs to T5 and Tremec as having a 23-spline clutch, whereas the Cangialosi Medatronics is referred to as 1-1/16" 10 spline Ford-Type.

US availability is cited as being this :

https://www.macsautoparts.com/ford_merc ... 39-v8.html

but I'm guessing that this reference, hidden down the list that I found when searching for Chuffer's AP Racing clutch here at CP2346 :

https://www.apracing.com/product_detail ... tions.aspx

CP2346-70 / Ø1.06" x 10T. Steel backed.

is also the one I need ? 9.5" is 240mm, 1-1/16" is 1.0625", and 10T means ............. 10 spline ?

But do I need a "Racing Clutch" anyway ?!

At £193 ?

PS - Now found standard version for £50, sounds more like it.

[PeterCrespin]

Une petite faute de frappe, peut-être, entre 2436/2346? Néamoins...

If AP are competitive on price and performance, we can assume there’s genuine extra capability for the extra dosh, but I doubt you need 350 lb/ft. If you want to do needs-based shopping, then the important number is whatever it gives as torque capacity for the plain vanilla friction plates. As for splines, I only have enough fingers and thumbs to count up to ten, so I don’t venture beyond the Jag spline setup.

If Paul C’s E-type kit has a 10-spline input, but uses Ford dimensions rather than Jag, I’d be surprised/worried.

[rfs1957]

Yes, 2346, well spotted - now corrected.

Paul doesn't seem worried, 10-spline and 1.06" it is, and it would take a braver man than me to query his choice.

HOWEVER next issue is that neither SNGB nor Manners have the genuine 9.5" cover in stock ........ reference HE4562. 6-8 week delay. And I dont want to buy a pattern.

Anyone any bright ideas ?

[PeterCrespin]

I probably lost track slightly, and by 'worried' I didn't mean mechanically but reputationally, because 'stuff happens'.

He supplies the correct Ford disc with his boxes, I'm sure. But anyone not buying his plate, or who later tries to fit a Jaguar friction plate to Paul's Ford spline is going to notice it's a very sloppy fit, without being so out of whack that it is obviously completely the wrong part.

If his were the larger size and therefore Jag's plate didn't fit, owners/shop mechanics would know the Jag part was wrong. The way it is now, they might think the plate is ok because it fits correctly on the old four-speed, but the Mediatronics gearbox is 'wrong' because it fits, but poorly. Everything he supplies fits, but you'd be amazed what punters get up to and then say on forums

[rfs1957]

Yes, hadn't thought of that. Never tried to see if it's possible.

[christopher storey]

Rory : where obtaining the driven plate has been difficult, I have had very satisfactory service from Bonding and Reline at Thurmaston in Leicester, who will put new linings on your plate at very modest cost and with a quick turnround. I posted mine off one day and had it back within about 4 days

[PeterCrespin]

Never tried to see if it's possible.

ul
I tried and it is.

I fitted a Jag plate on a Mustang T5 World Class and an Elite T5. Sloppy on both, to the point you or I would be seriously unimpressed but a punter might not notice and the setup would probably work bar some chatter at low idle. The plate fitted snug and smooth on two Jag gearboxes. I doubt there is some third version of the ten spline shaft that Paul uses?