Correcting clutch throwout geometry on stg3+

[talonXracer]

Resurfaced flywheels FTL with stage3-4 clutchs.
You do know that Exedy/Daiken manufactur ALMOST all the clutchs other than twin discs that are used in the Kseries trans.

The stage 3-4 clutchs from ACT, Centerforce, Exedy and Clutchmasters, all use the SAME pressure plate except for the exterior paint.
ACT hdss, Centerforce, FX400 pressure plates.


But they use different discs which are also from Exedy.

The ACT disc (exedy disc part# HD510D)

The Centerforce disc(exedy disc part# HD511D)

The CM FX400 disc(made by CM's own supplier supposedly(I suspect Exedy))



These pressure plates are a little on the "short side" for the installed height when compared to a stock dimension pressure plate. This shorter height is compensated for by the hydraulic system, but it places the throwout arm and slave cylinder close to half travel already. As you step on the clutch pedal the slave starts moving as well, but before the CMC has reached max travel the slave has But because the CMC is traveling it continues to pressurize the system causing the hydraulic failures seen.


This can be fixed by adding a washer between the throwout arm pivot ball stud and the clutch case correcting the faulty geometry that the stage3-4 clutchs creates and places the engagement point of the clutch pedal up off the floor.

[Jpax]

Thats one way to recycle. lol good info

[jimmyjames]

2 questions.
What's wrong exactly with a resurfaced flywheel?
Does this fix apply to all stg 3+ clutches (i.e. stg 4 competition clutch)?

[talonXracer]

Honda specifically states not to resurface the flywheel in the Helms. The reason for this is that it places the pressure plate closer to the engine and further from the throwout bearing resting position. Most stage 3-4 clutchs suffer from basically the same thing(their installed height is lower, just like resurfacing the fly with a stock pressure plate.) And when you resurface the fly and use a stage 3-4 pressure plate the installed height is even LOWER, this places more of the slave cylinders pushrod out of the slave, reducing the amount of throw available. Adding the washer behind the pivot point justs compensates for this lower installed height.

[03Si757]

I have a RED Clutchnet Pressure Plate and a Resurfaced flywheel, so I went ahead and did this trick, seems to work GREAT!

[gtimportfanatic]

thinking i shoulda done this

[EP3Casas]

wats happening with ur clutch?

[gtimportfanatic]

wats happening with ur clutch?

4 months later lol...

my clutch slips alot.. esp when i was boosted.. second gear would slip hard esp at the drag strip or if i was doin a hard pull.. u live n u learn

[Kerby]

wondering how much it would cost to manufacturer a bolt that would do the exact same thing... minus the washer to give the extra length to correct the geometry, but also have enough meat for the threads to make contact.

what's the thickness of the washer most people are using to correct the geometry?

[talonXracer]

I used a standard washer out of the parts bin, 1/16th"-3/32nd", a machined and hardened pivot costs considerably more than a washer.....

[Kerby]

a machined and hardened pivot costs considerably more than a washer.....

Not if you do a run. I'm sure alot of DC/EP owners are running stage 3 clutches. I'll look into it. I used to work for a machine shop. they have a threading division attached to the shop. so everything will be done inhouse, minus the heat treament. seeing how this is for an automotive application, the clearences are pretty much wide open.

[EP3Casas]

u have plenty of threads left even with the washer. at 1 point i had 2 washers on mine. did nothing for the problem but still had plenty of threads

[talonXracer]

Not if you do a run. I'm sure alot of DC/EP owners are running stage 3 clutches. I'll look into it. I used to work for a machine shop. they have a threading division attached to the shop. so everything will be done inhouse, minus the heat treament. seeing how this is for an automotive application, the clearences are pretty much wide open.

I HIGHLY doubt that you can produce a pivot ball for under .03$, I also worked at a machine shop, one that I am a part owner of.

I know I would not purchase one when a washer works. besides the reason for needing the washer is that very attitude of it "only being a automotive application" so the clearances are wide open.

[RedSiBaron]

those sprung clutch disks looks identical to the oem one i just put in, including that brand logo...from what i understand exedy is an oem supplier anyway...

[D3xn2o]

those sprung clutch disks looks identical to the oem one i just put in, including that brand logo...from what i understand exedy is an oem supplier anyway...

Indeed they are for most companies