1G Clutch question

[Adrian97]

Hello guys !
after installing act 2600, clutch master and slave cylinder started to leak my question is which I am supposed to buy so that it works well with ACT 2600 ? I also have to buy new ss Clutch Line(from master to slave cylinder extreme psi have one) or not?
Do i need to put a washer under the clutch pivit ball to have more adjustment for the slave cylinder rod ?

 

[bastarddsm]

The answer is, it depends. An ACT2600 is a bolt in replacement, and should work with stock parts, many times it does not. Right now I am running a very old ACT2600 and my current setup is a wilwood girling style 0.7" master cylinder, and a stock 1g slave. I also have modified the pedals to allow use of the full range of the longer wilwood master cylinder, but even a stock master cylinder can benefit from this. It involves welding a nut onto the clevis, as well as moving the upper clutch pedal stop, and re indexing the pedals to allow maximum travel. When doing this you have to be careful to make sure you do not overstroke the clutch diaphragm.

As for shimming the pivot ball, that also depends. You will need to install the transmission and see where your fork ends up, and then adjust accordingly. You also need to check the step height, and please note that the 0.610-.612" that everyone recommends is not always correct. In the end the step should be so that the diaphragm fingers are very close to flat, maybe even "in" just a little bit.
To be honest though, I never even check this anymore as it's really not that critical in my application.

Lastly, do not use a full length ss clutchline. Leave as much hard line in as possible, as the hard line is much more rigid and you will have less wasted clutch pedal travel.

I could write a small book on the dsm clutch system, and all the details you have to watch out for.

 

[Adrian97]

Thanks man a lot of info here
I have new act flywheel so new oem master and slave cylinder should works fine? but I can not buy spare parts under any circumstances.

 

[pauleyman]

New flywheel does not mean good step height. Check it with a depth mic do not use a caliper.

 

[Adrian97]

By Bad "Step height" can there be a problem that the clutch is taking at the floor?
as if there was no pressure in the system..

and by Step height it means that I need to resurface flywheel to .610 ?

 

[pauleyman]

By Bad "Step height" can there be a problem that the clutch is taking at the floor?
as if there was no pressure in the system..

What does "taking at the floor" mean? If you mean engagement is very close to the floor yes the step height can cause that. You need to understand how the system works. Have you even adjusted anything? Give us more info. Did you already replace the master and slave?

 

[Adrian97]

Yess engagement is very close to the floor..
I looked through the whole forum abut ACT 2600
So everything that was necessary I exchanged for new OEM, master and slave also..
clutch set like "Jack" said and properly vented and still have the problem.. and now I discovered that I bought the flywheel act good, but a little used(it looks like new) so I think that i need to resurface that flywheel..
but I do not quite understand what "Step height" means because my English is not so good.
resurface flywheel it means the same as "Step height" ?
step height to 0.610 is it the same concept as resurface flywheel to 0.610 ?

 

[pauleyman]

The distance between the two surfaces measured in thousandths of an inch. That is step height. Each brand of clutch requires a particular step height. Just because a flywheel is new or nearly so does NOT mean it has the correct step height. Even if it's an act flywheel with an act clutch.

 

[bastarddsm]

The distance between the two surfaces measured in thousandths of an inch. That is step height. Each brand of clutch requires a particular step height. Just because a flywheel is new or nearly so does NOT mean it has the correct step height. Even if it's an act flywheel with an act clutch.

Don't forget, even because the manufacturer recommends a specific step height doesn't mean it's the correct step height. Mostly the step height should be so that with a new disc the PP fingers are just slightly below flat. Really, the PP manufacuturers should specify where the fingers should be. What affects this is disc thickness, and the spring design. You want the fingers flat to keep the centrifugal force from working on the fingers and releasing the clutch, or clamping the clutch, moving the TOB back, and eating up TOB travel. However certain things may modify the flat finger approach - A disc with a really thick hub may need the fingers up some to allow enough movement for clean release, or they may require something different to optimize the clamp load. It's all about compromises, and usually they suck, and the clutch manufacturers sell what sells, not what works, and that sucks.

I first got wise to this when I realized that an ACT street disc is a bunch thicker than a puck disc, and they recommend the same step height.....

 

[Adrian97]

Ok so resurface flywheel and step height is two different things? Or when I go to parts store machine shop and say that I will resurface my flywheel at 0.610 that means step height will be 0.610 after resurfacing ?

 

[pauleyman]

Ok so resurface flywheel and step height is two different things? Or when I go to parts store machine shop and say that I will resurface my flywheel at 0.610 that means step height will be 0.610 after resurfacing ?

Yes it's the same thing. When you surface a stepped flywheel yiu machine both the pads the plate bolts to and the friction surface. A crappt machinist will take off the same from both or worse. A good machinist will ask what step height you need or at least wont have a problem when you tell him what you need. You should double check also. The best way to know for sure what it is is to measure yourself. Do not use a dial caliper.
http://dsmtuners.com/threads/clutch-basic-101-a-clutch-basics-thread-for-everybody.459908/

 

[Adrian97]

Now I Understand Thank u all of you
good thread btw, I read everything, very useful

 

[Adrian97]

Just two quick queation.
1. I live in Europe so we are writing about 0.610inch or 0.610mm ?
2. I find this theard
http://www.dsmtuners.com/threads/flywheel-step-height.363921/
They are writing about -0.610 and 0.610 what does it mean?
I need to do step height at -0.610 or 0.610 ?

I'm sorry for so many questions and thank you for your attention

 

[pauleyman]

It's in inches so thousandths of an inch. And the number is meaningless. You need the height required for YOUR clutch. Call the manufacturer

 

[Adrian97]

My clutch is Brand New Act 2600 street disk so I think .610 will be ok..
But -.610 look very different then .610 so i just wonder if it is possible to have -.610.. or somebody make a mistake in that theard.
Edit.
"Yes, it is stepped down .610 inches from the mounting surface for the pressure plate to the friction surface." Okay thats way he calls it -.610 so .610 and -.610 it's the same in this case.

 

[pauleyman]

It's just a convention of how to call it. It should be obvious the distance between the pad and the surface is step height. .610 in inches or 610 thousandths.

 

[Adrian97]

because my clutch is not set correctly right now (it's screwed up max to master cylinder so that the clutch engagement should be very high)
and not bleed at all, so i have a question:
do I have to adjust them first? like here
http://dsmtech.forumotion.com/t13-how-to-properly-adjust-your-clutch-on-a-2g-1g-evo
or do I have bleed the clutch first? like here
http://eatsleepdsmmag.com/how-to-bleed-your-clutch/
Logic suggests that I neee to bleed first, but I would like to ask

 

[Vegas Smith]

I would bleed the clutch first before you do any adjustments.

 

[bastarddsm]

I can't quite understand what your are getting at OP. But I'll try. If you have the master cylinder rod threaded all the way out it's possible that you could have the bleed port blocked. This would keep the Master cylinder from taking in fluid. I would put the rod in the middle of the adjustment, and then bleed the clutch, and then adjust the rod as far out as possible without blocking the bleed port.

 

[Adrian97]

Hello guys its me again
My GSX standing 4 months at the mechanic. I have a headache already. I gave the car to the mechanic only because I do not have time to do it alone because I will be getting married soon. Anyway mechanic guy is mount my clutch 4 months already... and it still does not work, I bought ACT 2600+ new oem slave and master + act flywheel stepped to 0.610 and mechanic guy says that my new oem slave and master ia not strength enough to make that clutch works.. is it possible? or he just can not mount it correctly, set it and bleed it. Can he be right? or do I have to take the car and do it the right way.