Clutch tech

[Typ3racing]

Yesterday i pulled engine and tranny out.
This is what the clutch looks like

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Got funny colours but almost no wear (0,1mm each disc)

i dont think this is really bad for  about 60 runs and some street driving.

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Lets see what another 100 horses will do with the clutch at DDD

[MeXX]

Yesterday i pulled engine and tranny out.
This is what the clutch looks like

Got funny colours but almost no wear (0,1mm each disc)
i dont think this is really bad for  about 60 runs and some street driving.
Lets see what another 100 horses will do with the clutch at DDD

Sevas Uwe

Looks like your clutch and clutch management works pretty fine.
What about the floaters do they have wear and what about wrapping?
Did you measure how flat they stay?

keep on clutchin'

MeXX

[Typ3racing]

the floater, pressure plate and flywheel have worn less then a tenth.

And still are pretty straight.

After i got used to it, the clutch management is working fine.

So i will put it all together again when the engine is ready (you remind the Cosworth parts?)
and then off to DDD11 to run a few 10s passes.

[MeXX]

So i will put it all together again when the engine is ready (you remind the Cosworth parts?)
and then off to DDD11 to run a few 10s passes.

Hi

Lookin' forward hearing your new engine rumble.....

MeXX

[richie]

After a years abuse the floater finally gave up this might explain why I was having difficulty adjusting the clutch slip, it would either bog or slip to much, the discs are still ok and the cover will get a tiny amount removed from resurfacing, flywheel is good so I just got to put a new floater in there, no exotic parts here though

cheers Richie

[Airspeed]

What disks are those Richie?

[richie]

What disks are those Richie?

Kennedy's

cheers Richie

[Airspeed]

Thats indeed not very exotic 

Amazing you broke off a tab from the floater plate. The other tabs look not too happy either 
Good thing you caught it on time.

[MeXX]

Amazing you broke off a tab from the floater plate. The other tabs look not too happy either 
Good thing you caught it on time.

Looks like a am happy to have 12 tabs 

MeXX

[Typ3racing]

At DDD the launch was working fine.

In this video you can see how fine the system works off the line:

www.youtube.com/embed/QMTsy5joZyo

Every 60ft below 1.6 (faster than Mexx running N/A)

Not too bad for 2600lbs at the tree 

And btw: Car was still running on sunday 

[Turbo_Rich]

Thought I'd post up my findings after recently pulling the engine from my bug. My setup is very basic. A custom flywheel to mate the type 4 to a Porsche 915 gearbox thus utilising the 911 clutch. I am running a Helix sprung cerametallic 4 puck clutch an a standard 911 cover plate. This has been in the car since about 2008. The car puts out about 270ft/lbs torque at the wheels and I've not had trouble with the clutch slipping apart from trying to launch in 2nd and when it got oil contaminated.

Anyway just want to post some pics up. My fear now is there may be a hairline crack in the mounting flange in the flywheel which will mean a new one so looking at options and opinions.




The friction plate had obviously got a bit hot and is now down to the rivets as well as the faces starting to break up!




Worst bit is the flywheel this shows heat distortion, crazing and some scoring. I've also noticed what appears to be a hair line crack round the mounting flange!

[Frallan]

Built out of Swedish steel 2541-3 which is very similar to 300M.
Let me know if you are interested. I will most likley not use it.

[Turbo_Rich]

Thanks Frallan. I'm waiting for the results of the crack test. Let me know what you would want for it.

I spoke to Helix about the clutch plate and they can re-pad this for a reasonable price so this is good news. 

[MeXX]

I'm waiting for the results of the crack test.

Hi

This cracks are typical for excessive heat that can't be handled by the casted material.

MeXX

[Turbo_Rich]

Thanks, I've shown it to a few people now any they weren't bothered and have seen worse, so that's reassuring. The bit I'm concerned with is a hair line crack round the mounting flange. Don't want that shearing off!

[MeXX]

Thanks, I've shown it to a few people now any they weren't bothered and have seen worse, so that's reassuring. The bit I'm concerned with is a hair line crack round the mounting flange. Don't want that shearing off!

Hi

I would say pretty the same. I have see much worse cracks on my one pressure pates. If you can grind it flat without removing excessive material you can still use it on street. If you do a lot high horsepower launches where the clutch has to take an enormous amount of heat
and you should step up to a all steel solution, anyway.

BTW Launching in 2nd gear is much more heat for the clutch.

So keep on clutching

MeXX

[Airspeed]

I can't see the crack around the mounting flange you refer to Richard, but I do see you're using stock type 4 flywheel bolts?
Maybe the flywheel moved a little during launch and that might have caused the crack there?
Upgraded, shanked, reamed-to-fit 12.9 bolts, torqued a little more then stock will go a (very) long way preventing this, even on a cast flywheel, is my personal experience at least.

[Frallan]

Ben Crisp at TTV will build very nice flywheels.
He did one for me few years ago and it was more or less custombuilt.

If anyone else wish to go this route, maybe you can get a better price?

info@ttvracing.com

[Turbo_Rich]

Managed to pickup the flywheel last week and unfortunately it was confirmed that there was a hairline crack round the mounting flange. Glad I spotted that now and not once the clutch had exited the gearbox! So I have started hunting around for a new one and have a few leads. However I am wondering whether it is time to upgrade to a twin disc to try and dissipate some of the heat build up I am seeing. Any thoughts on this as the last one has been good so far with no clutch management but moving on I'm looking at adding this and think with some more clutch slip in the launch it may be bit much for the current setup

Pic of the crack!

[MeXX]

Hi

Here comes another update from my clutch:
Yesterday I pulled my engine to check the clutch, there 57 launches but only a few with nitrous on the parts:
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Clutch disc still smooth and shiny 6.31mm thick (appr. 0.15mm wear)


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still fairly flat and didn't wrap at all


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pressure plate wear plates are softer and therefore there is more wear on them


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maximum wear of the wear plates is 0.35mm per side.

Total wear of the clutch after 57 launches is about 0.8mm and it's still usable and as the clutch disc shows only 0.15mm wear I will only change the wear plates next time.

So long

MeXX

[Airspeed]

How much does your Ghia weigh Mexx?

[MeXX]

How much does your Ghia weigh Mexx?

Dear Walter

My car weights right at the tree with diver fuel and a full nitrous bottle

So light

MeXX

[Airspeed]

Thanks! Thats very light indeed. Great job!
I think total weight makes a difference in how a clutch 'survives'.

[MeXX]

Hi

Here comes another update from my clutch:
The last time I pulled my engine to check the clutch, there were 85 launches the last 20 with nitrous on the parts:

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Clutch disc still smooth and shiny 6.28mm thick (appr. 0.18mm wear)


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still fairly flat and didn't wrap at all


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flywheel wear plates are softer and therefore there is more wear on them


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pressure plate wear plates are softer and therefore there is more wear on them

maximum wear of the wear plates is 0.38mm per side.

Total wear of the clutch after 85 launches is still beyond 1mm and it's still usable and as the clutch disc shows only 0.18mm wear I will only change the wear plates next time.

So long

MeXX

[MeXX]

Hi

Just returned  from NitrOlympX.

Here is another update from my clutch:
I have done another 5 launches on Nitrous;
As the 60 ft has to come down the nitrous level at the tree has to go up  


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MeXX

[Bad bug]

Found a pic of my latest set-up which holded 465hp (I launch soft I must admit, but car is very heavy):

Do you have to use a tilton hydraulic clutch release with this setup.

[Airspeed]

No.

[Erlend / bug66]

A little easier than adjusting a REV6...

[Silversoar]

Erlend,

What parts have you used on your setup?

[Erlend / bug66]

Erlend,

What parts have you used on your setup?

I'll send you an PM