Clutch Thoughts
Turbo Mini Forums

So the clutch on the sprint is slipping. Its a verto with the strongest diphram I had (it's a pretty tough Veleo one).

So I have a couple of choices

1) persever with the RTS. I made one but two Veleos were just too much, and I don't have any other diaphrams.
2) Considering that the plate has lasted 12 months of abuse, try one of the sintered plates. My thinking is that the clutch has been fine so a slightly better material may solve the problem. My worry here is that the plate may not be user friendly, although it's pretty progressive in the TT.

Also, is anyone else having trouble buying Old Elpaso Chilli Mix, there is none in North Yorkshire (and hasn't been for a few months), and the alternatives are just not as good.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

If you're currently on organic, then a metallic plate will offer a lot more grip.

Also worth ensuring the clutch when compressed is at it's maximum clamp.

Fingers should be almost flat.

Never actually checked a std clutch to see how much scope there is for increasing clamp by optimising this area

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

I'm lasy. I eithe rlet the wife make it properly got some tins of 'STAG' chilli

Mmm chilli

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

do you mean the RTS was too stiff underfoot? if so where;s the bite point?

If its near the top then you could try lengthening the clutch arm, as robert has done, and I am doing,

Robert has a end cut from another arm bolted onto lengthen the arm about 25mm,

I am converting a cable arm by slitting the end and fitting ball races where the rubber would be.

Why do you say two Valeos are to much?
From what I understood 2 Valeos would be lighter than 2 APs?

Nice Joe!

Dazed and Confused....

http://www.google.co.uk/search?q=Old+Elpas...63da3053c718ce4

I hate it when you cant find good food!

lidl's a bugger for that! good luck

I had some of the dynamite hot stuff once, never again! It stung the next day.

one day boost will be mine!

Well one Veleo is just about coping with a new plate and is ok on the foot. The RTS I made wit h2 Valoes was impossible to press, I admit that it needed fettling, but it was never going to be a nice pedal.

The Valoes come in many strengths, and all the ones I have are pretty strong individually.

I think using two of the other type (AP?) which in my experience are weaker than the Valeos would be better. From other posts, these conversions are more successful than using Valeos.

For £80 I might try a sintered plate.

Uses Schwarts chilly mix, just not as good, always been tempted with a tin of Stagg.

Edited by wil_h on 18th May, 2011.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

1293 Turbo mini

I have a sintered plate in the hillclimber, obviously I don't us it on the road, but it's not an issue driving it around the paddock or on to the trailer (which need a progresive clutch).

Whatever people have said about sintered plates, it's not my experience.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

i have raced on sintered clutchs on tracks but when the flag drops you are rolling but around the streets i would say it not that nice

1293 Turbo mini

Stag chilli isn't very good for you. It's generally our evening meals at Avon/MITP and results in a lot of toilet trips. That might be something to do with John adding half a bottle of insanity sauce though!

The problem with race cars is that there is very little give in anything, so any clutch seems sudden, as it should. But in the hillclimber we have one and it is fine, driving slowly around the paddock and to the start line it is not a problem. Add in a little extra rubber, engine mounts, engine steady, softer springs plus a heavier fly wheel that you have on a road car and bobs your knob. Probably a little less progressive, but perfectly driveable.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Joe, did this work?

Sturgeo is complaining about the Miglia clutch being too stiff

On 18th May, 2011 Joe C said:
do you mean the RTS was too stiff underfoot? if so where;s the bite point?

If its near the top then you could try lengthening the clutch arm, as robert has done, and I am doing,

Robert has a end cut from another arm bolted onto lengthen the arm about 25mm,

I am converting a cable arm by slitting the end and fitting ball races where the rubber would be.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

i would go for the easy fix wil and go for the sinterd plate .......or turn the boost down buddy ......lol

Dunno yet :(

The pedal feels like it's working, but I've not had the lump running yet to check the bite point.

On 30th Jun, 2011 Paul S said:

Joe, did this work?

Sturgeo is complaining about the Miglia clutch being too stiff

On 18th May, 2011 Joe C said:
do you mean the RTS was too stiff underfoot? if so where;s the bite point?

If its near the top then you could try lengthening the clutch arm, as robert has done, and I am doing,

Robert has a end cut from another arm bolted onto lengthen the arm about 25mm,

I am converting a cable arm by slitting the end and fitting ball races where the rubber would be.

Thanks Joe.

Bite point is right at the top, so we'll give it a try.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I covered close to 100k in the years I was driving my mini. It always had an AP paddle friction disc ( well, several actually ) and the heaviest verto cover I could find

There is nothing difficult whatsoever in driving one. And I had a straight cut gearset with a tall first gear. It certainly wasnt organic smooth, but it was never difficult to drive in traffic. And certainly wasnt on/off like some people describe.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

True,
but I'd lay money that my verto is at least 50% harder to operate than yours was,

Dont get me wrong though, its ok in fact fine mist of the time, but half an hour in traffic and your knee will really start to feel it.

I need thicker soled shoes to operate mine.

Longer arm is on the to do list.

In the 13's at last!.. Just

I stuck a 4-plate paddle in on Friday. It is a bit grabby, but not undriveable. I'll see how it goes over time.

No hint of a slip now either.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Ive just been out geting my oil pressure up on the starter,

while i was at it I bunged it in gear with the clutch down, dosent seem to drag and starts to bite about 1" from the floor.

And why is yours heavier ?


And whilst a longer arm will reduce the effort required to operate the clutch. Surely it will no longer have adequate travel to actually disengage the clutch ?

And as far as paddles go. More paddles = smoother engagement. But apparently slightly less grip. Although Ive never got my head around that one.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

because I belive my two verto springs whatever rate they are will be more than any one selected verto spring.

on my RTS verto the bite point was very near the top, all the action was in the top inch, i think this may be a charachteristic of the AP verto's due to their internal leverage ratio, anyway the long and short of it is I can afford to trade travel and effort so have done.