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Old 03-12-2009, 10:23 PM   #1
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Default Twin disc clutch @ 949Racing



Just received the pre-production sample to put in the OGK. It's been run in a stock 1.6 and abused for a few hours, now it gets beat up some more. The same cover, discs and pressure plate design have a solid history of reliable use at over 600whp in other applications in drag and oval racing. They're quite over built for your typical 250~300whp Miata but I'm OK with that.

The sample shown is a little over 16 lbs but the production unit with one piece flywheel will be around 15.8 lbs for the entire assembly.

The sample 6.6# flywheel shown has a pressed and welded on ring gear on a machined from forged billet wheel. The production unit is one piece forged steel. Also note the pic shows sintered .250" discs but the standard unit will be organic. The kit will come complete with T/O & pilot bearings, alignment tool and pressure plate travel limiter. No exact price yet but we're trying to the twin organic shipped for under $1000.

Once final testing is complete in a few weeks, we'll start taking orders for all four variants:

* twin organic
* twin metallic
* single organic
* single metallic
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Old 03-12-2009, 10:46 PM   #2
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Emilio,
Do you have ballpark pricing on replacement friction materials for the clutch discs, flywheel, and pressure plate materials? You know I'm a sad, lonely bastard...and cheap too.
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Old 03-12-2009, 10:57 PM   #3
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Emilio,
Do you have ballpark pricing on replacement friction materials for the clutch discs, flywheel, and pressure plate materials? You know I'm a sad, lonely bastard...and cheap too.
I don't even have the retail price nailed down yet. For now, assume a little less than the equivalent Tilton parts. If you're using organic and only 250whp or so, the steel bits will last just about forever. I'd expect the discs to be in the $85~110 each range. The flywheel is a one piece. Looked at doing an insert but it just weakens the structure and requires redundant mass.

I'll have replacement part pricing when I have the final retail price for the whole assembly.
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Old 03-13-2009, 01:14 AM   #4
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I'm definitely in! As long as it will hold the power ill take a twin disc Metallic when they are ready!
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Old 03-13-2009, 01:41 AM   #5
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I'm definitely in! As long as it will hold the power ill take a twin disc Metallic when they are ready!
You know the organic is good for over 450whp right? The metallic should be good for upwards of 600whp. Unless you're drag racing and in that power range, I'd suggest the organic. Lighter and much more pleasant to live with.
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Old 03-13-2009, 11:19 AM   #6
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murder for hire anyone? i need some quick cash!
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Old 03-13-2009, 11:29 AM   #7
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murder for hire anyone? i need some quick cash!
Not sure I would be saying that around these parts anymore...
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Old 03-13-2009, 11:49 AM   #8
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Planning 400 RWHP track only. Metallic is what i'm looking for.
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Old 03-13-2009, 11:55 AM   #9
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murder for hire anyone? i need some quick cash!
PM me.


I'm interested in the organic ****.
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Old 03-14-2009, 03:24 PM   #10
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YEAH. Emilio is the king. Next time my **** comes apart, this will go back in. I love sorted.
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Old 05-13-2009, 11:09 AM   #11
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Default Taking orders now

Taking orders for the 7.25" twin disc race clutch now. ETA around June 21.

Single or twin disc, organic or ceramic friction material.

VISIT THE WEBSITE for more info
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Old 05-13-2009, 12:47 PM   #12
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ohhhhh this thing is pretty.
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Old 07-17-2009, 05:50 PM   #13
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Final production version is in.
Single Disc Ceramic version is 12.4 lbs including flywheel.
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Old 07-17-2009, 06:04 PM   #14
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you have pictures of the twin yet? the ones above and on the site look like singles.

also is there any future spring upgrade option? just asking for posterity.

oh and I saw in the benefits section you are claiming "the twin plate discs will last twice as long as an equivalent single disc assembly."

I dont know if I'd agree. In my experience the longevity is a bit shy of a stock clutch because of the increased number of wear surfaces coupled with a lower tolerance for change in stack (disk-floater-disk) height compared to a single disk setup. You've gotta provide twice the clearance for disengagement and it leaves less room for disk wear.

But hell if yours DOES last longer, that's damn impressive.
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Old 07-17-2009, 06:57 PM   #15
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Originally Posted by y8s View Post
you have pictures of the twin yet? the ones above and on the site look like singles.

also is there any future spring upgrade option? just asking for posterity.

oh and I saw in the benefits section you are claiming "the twin plate discs will last twice as long as an equivalent single disc assembly."

I dont know if I'd agree. In my experience the longevity is a bit shy of a stock clutch because of the increased number of wear surfaces coupled with a lower tolerance for change in stack (disk-floater-disk) height compared to a single disk setup. You've gotta provide twice the clearance for disengagement and it leaves less room for disk wear.

But hell if yours DOES last longer, that's damn impressive.
The image of the production single now posted replaced the old image of the twin prototype. Exact same configuration so the pics will look the same anyway. The difference is in the cover stanchion height and custom T/O bearing/spacer for the single. The spring geometry of the single is also slightly different to accommodate the shorter throw.

Regarding the wear, that's based on a little bit of personal experience and the more informed opinions of reps/engineers from three different racing clutch manufacturers.

No plans for different springs. I think the disc options will accommodate most user profiles.
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Old 07-17-2009, 08:04 PM   #16
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Quote:
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Regarding the wear, that's based on a little bit of personal experience and the more informed opinions of reps/engineers from three different racing clutch manufacturers.
you got me beat. my comments were based on a little bit of personal experience and only one multi-plate clutch manufacturer.
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Old 02-15-2010, 06:51 PM   #17
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Single organic version. One of these days, It'll make a really light clutch.


Last edited by emilio700; 02-16-2010 at 12:49 AM.
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Old 02-16-2010, 12:50 AM   #18
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Fixed the image link..
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Old 02-16-2010, 01:35 AM   #19
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That looks great, have you run the single disc assembly yet?
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Old 02-16-2010, 01:45 AM   #20
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That looks great, have you run the single disc assembly yet?
Of course.
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