Clutch Weights

[Reeves]

Warren and I were doing some talking the other day, and came up with an idea to add to this thread.

Besides weight of the clutch discs, lets start adding the O.D. and I.D. of friction material, along with how many pucks and the dimensions on the pucks.

Hopefully some people that are smarter than me will be able to take some of this information and figure out the inertia or flywheel effect? Doesn't need to be exact science, but it would be nice to know for example:

8" disc x 2 = XX flywheel effect
9" disc x 1 = XX flywheel effect

[csxtra]

Warning: Zombie Thread!!!

Another clutch disk weight for the list...

TU Ultimate 4 puck 232mm unsprung Feramic:


2 lbs 3 oz

So far I LOVE this clutch, the purple plate has a very light clutch pedal, it holds very well (multiple hard launches with 25 inch slicks with no problems), and it has even smoother engagement than the sprung feramic full face disk I had on there before.

[tryingbe]

Relentless ceramic clutch.


TU Ultimate 4 puck 232mm unsprung Feramic:


MORE INTERESTINGLY
Used Sach plate


New Black TU plate (LUK stamped on it)


Last but not least, resurfaced TU budget flywheel

[acannell]

if autozone is right, the stock flywheel is:

OD 11.786"
Weight 19lbs

Eyeballing it and adjusting, looks like maybe 0.75" thick and essentially 4" ID given the thinner area in the middle?

That puts the energy at 6000 rpm at around 23kJ

Or roughly the amount of energy in a 3200lb daytona at 12mph.

Charging it with a constant torque of 300 ft/lbs would take around 180ms to reach 6000 rpm.

Doesnt include the pressure plate/clutch disc, etc..

The clutch disc inertia has got to be tiny compared to that, why is it important? Does reducing it make shifting easier because its on the tranny input shaft?

If you tell me OD, ID, thickness, density, and tensile strength, I can tell you all the above as well as burst rpm.

BTW you can have solidworks tell you the moment of inertia for whatever you have modeled and use it to get precise energy stats for arbitrary designs like clutch discs or specific flywheel lightening ideas.

[Chris W]

We took a few photos of our newly designed lightweight Competition flywheels last week to update our website. The new design brings the weight down even further to under 12 lbs. Unfortunately it was sold before we could snap a picture of it on the digital scale. We expect new inventory in a week or so and will take a shot of it then or you can stop by our booth at Carlisle (I-97 to I-100) where we will have samples of all our flywheels and clutch products.

Here's a 16-valve version with the magnetic pick up notches.




Chris-TU

[bgbmxer]

I think i would like to try an unsprung disc in a street car and see how i like it. They don't cost very much..

for example you can get a 4puck ceramic unsprung hub from clutchnet for like $75 shipped!

We ran a 4 puck ceramic un sprung in my srt swap first gen. My gf daily drove it and it was basically almost an on off switch but you could slip it a little bit. It only lasted 20k and wore into the flywheel 20thousands with thr disk looking almost new. Switched to Kevlar and she said it felt like a stock car and wanted her old clutch back. If you get in traffic jams a lot I would avoid it. It's very chattery but grabbed and never ever slipped. You can definitly daily drive it just takes some getting used to. The only difference I noticed between sprung and unsprung hubs is when your taking off litely or using reverse it lessens the chatter and has less noise. When your launching and shifting hard I could never tell the difference. I have had both 4puck ceramic in sprung and unsprung. 6 puck is way more mellow grabby wise then 4 puck but usually rated for less power.

[Vigo]

What style was the kevlar disc? Not an unsprung puck style, right?

That new TU flywheel looks exciting!

[bgbmxer]

What style was the kevlar disc? Not an unsprung puck style, right?

That new TU flywheel looks exciting!

The clutch is from clutchmasters and yes it's sprung. But I have had both 4 puck sprung and un sprung ceramic and also 6 puck. The Kevlar drives almost like a stock clutch but I'm not throwing slicks on the car and it doesn't get traction until 3rd ger most of the time.

http://www.modernperformance.com/pop...m_nonmodlg.jpg

where does everyone get there custom clutch stuff made. I'm gonna need a custom flywheel made that's the same specs as the jeep with the 2.4 but I don't want the dual mass part. Also I need to have a clutch for that flywheel but with the Chevy spline pattern. O and good for 600 horse on slicks.

[Shadow]

We took a few photos of our newly designed lightweight Competition flywheels last week to update our website. The new design brings the weight down even further to under 12 lbs. Unfortunately it was sold before we could snap a picture of it on the digital scale. We expect new inventory in a week or so and will take a shot of it then or you can stop by our booth at Carlisle (I-97 to I-100) where we will have samples of all our flywheels and clutch products.

Here's a 16-valve version with the magnetic pick up notches.




Chris-TU

Nice lookin flywheel!

[Reaper1]

That flywheel looks like it has a lot of material removed from the backside. Am I right?

[Chris W]

That flywheel looks like it has a lot of material removed from the backside. Am I right?

Compared to a factory version it's more then 6 pounds of material. I haven't had the opportunity to inspect the old style with the new style together to see how different they are.

True Story- A few weeks ago a customer ordered our competition flywheel with his Stage IV clutch. He recently contacted us sounding a bit annoyed. Apparently we were holding up his build because he was still waiting on the flywheel. I directed him to the package and asked him to remove the clutch and flip it over. He was amazed to find the flywheel on the other side. Marc usually places the clutch on the flywheel as an assembly then covers them together with shrink wrap. The box was so light he assumed it must be shipping separately. That's happened a few times already.

Chris-TU

[Reaper1]

Wow, yeah, that is a pretty good amount of material!

[Reeves]

MORE INTERESTINGLY
Used Sach plate

This looks to be dual diaphragm?

New Black TU plate (LUK stamped on it)

Good to know. I didn't weigh mine.

And although all the other weights (pressure plate and flywheel) are useful info, the original intent of this thread was for the disc weight, as that has an affect on shifting. Let's keep this thread going!

Here are some recent pics and weights:

[tryingbe]

This looks to be dual diaphragm?

Yes, dual diaphgram by Relentless Racing

[tryingbe]

My feramic clutch is already worn out, it is truly for track only. Bought a 6 punk ceramic as a replacement.

Resurfaced both the flywheel and pressure plate.

[cordes]

What mileage did you get out of the feramic unit?

[tryingbe]

What mileage did you get out of the feramic unit?

4,266 miles before I took the engine out for a non clutch related issue, I then noticed the pressure plate side of the feramic clutch is worn down to the rivets. Flywheel side is perfectly fine.

Feramic = NOT RECOMMEND for street use!

[Shadow]

The simple fact that one side wore out completely while the other side has minimal wear = Something was wrong that caused the excessive wear to the one side.

How much break in did you give it? (may not be relevant in this case)

Was it hard to shift?

Did disc move freely on input splines? (but Not Too freely)

If everything was installed and working correctly, and clutch had no manufacturing issues, you should see About the same wear on either side of the disc. (more or less) Exception being when two different friction materials are used on either side.

[BadAssPerformance]

+1 to make sure disk easy to slide on splines or it will wear one side more

[Ondonti]

Feel like we need a ranking compiled....