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Posted by AaronG (more from AaronG) on Sat, 31 Jul 2010 06:14:13 Share Post by Email
In Reply to: Performance clutch problem, AaronG, Fri, 30 Jul 2010 22:25:44
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I took the car out this morning, and after letting it warm up, I ran it really hard. Clutch seemed perfect. No slipping whatsoever? After reading about Kevlar clutches on other message boards it seems my experience is fairly normal?

Here's an excerpt from a Miata BB.
"Here's what the guy who rebuilt it said, specifically referring to "breaking in" vs "seating":

"You want to take it real easy. Then, after time goes by (sounded like he meant SUFFICIENT time - onramp), you'll start to feel it slip a little. That's when you want to start driving it harder. Then, it will seat and at that point it will actually GLAZE a little and turn brown, and that's what you want. See, let's say you go out right away and drive it really hard - then it's going to turn black and go almost charcoal-ly. Then it's ruined forever."

So it seems to me that the point is controlled application of heat, which is intended to change the nature of the Kevlar material. If the heat is improperly applied the material is also changed, but in an un-desirable way. Not enough heat and the material is not changed enough, which might as well be the same as not breaking it in at all. Or, in other words, if you break it in properly you heat it up enough slowly enough, you will glaze it properly such that it can withstand sudden heat (blow off ricer boy civic at the stoplight) in the future. That would be my theory. It's only a theory.

The kevlar material itself is paper thin so I can believe that there is a narrow window, somehow somewhere. It's reallllly thin. Since it's benefit is to last forever, I can see how it must be perfect, clearly it hardly wears away, if you screw it up there's no more of it to wear away to get to good stuff underneath the bad stuff.

As to how you can drive it after it's broken in, still no one will discuss specifics. What would those be anyway, that issue is so subjective. But I think that the kind of clutch slippage you'd do at the dragstrip to get the very very best 1/4 mile possible is not a good idea. And somewhere between that and zero slippage is the "charcoal" point of Kevalr, and I hope I don't find it :)"



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