clutch works fine. for 10 minutes. then sucks bawlz. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-06-2008, 11:58 PM   #21
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Originally Posted by MikeRiv87 View Post
I have a White 2 door 5 speed I would let go for about $1200 if your really serious.
i'd have already said yes if it was a 4-door and had under 180k.

Mostly, I just need somewhere to hang my spare wheels:

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Old 03-06-2008, 11:59 PM   #22
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yay, maybe you can drive out sunday and help brad and me out.
what're all yalls doin sunday?
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Old 03-07-2008, 06:05 AM   #23
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Tilton cover the damage?

On/off topic, that is indeed a Tilton twin-disc right? How much did it bend you over for, how do you like it, engagement, power rating, etc.
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Old 03-07-2008, 10:57 AM   #24
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tilton wouldn't cover damage from normal use... it's a racing clutch. i didn't even bother to ask.

It is a tilton twin disk, yup. I eschewed the cerametallic disks for organic disks (though you can run one of each and get something close to the best of both worlds).

It's not expensive. The clutch itself is $500. Two disks is about $90. But you either have to have the unobtainable flywheel or do what Brian did and make one out of a 1.6L flywheel (which is pretty awesome if you think about it). Bearings are the normal miata bearings. You do have to make the new pivot or better yet, do the 1.6 flywheel thing and make it the right height in the first place.
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Old 03-07-2008, 12:10 PM   #25
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Basically as the pressure plate (a separate piece shown in the upper right--the top of the two silver rings) gets heat cycled, the friction surface becomes cone-shaped because of the asymmetry of the metal. The inside circle tries to expand as much as the outside and the result is it pushes the circle out of plane since it has nowhere to go.

M
I would think that the outside, which is thinner, could get hotter than the inside, which is thicker and may have a better heat sink capability. So the outside would want to expand more than the inside making it coned not the other way around. Theoretically if the part stays the same temp everywhere as it heats up it should stay flat. But whatever, I'm glad you got it fixed, hopefully! Kind of a killer setup...
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Old 03-07-2008, 12:34 PM   #26
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i dont know the actual mechanics of the expansion, but it's pretty consistent since I had an older pressure plate from way back when that had the same cone-distortion and tilton mentioned it specifically.

it could also be that the cross section of the ring is roughly triangular or that the outer edges have extra material where they lock into the clutch cover and dont get as hot so they dont expand as much. (those 6 notches)

needless to say, the new one looks beefy. I snapped a picture but it's on my camera at home.
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Old 03-08-2008, 11:56 PM   #27
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... time passes ...

drove the car to dinner... other than a squealy-*** belt, it's running nice.

the clutch is smoov.

now.... the squeal is driving me nuts. it's a new belt. could it be the alternator bearing?
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Old 03-09-2008, 12:20 AM   #28
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Umm, mine squealed because when i changed my belts the other ones were not as loose as the old ones and i didn't move the alternator tight enough to the left so it was to much to the right so the belt was loose hense the squealing, so try to push your alternator to the left more/so the belt gets tighter see if that helps, i used a pry bar then tightened the bolt. Or just squirt some oil or WD40 on the pulley and if it stops squealing then go get some spray grease **** or pulley grease, if that wont work try moving the alternator so its tighter.
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Old 03-09-2008, 12:46 AM   #29
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yeah i'll recheck the tension and hopefully that'll fix it.
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Old 03-10-2008, 02:33 AM   #30
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yeah i'll recheck the tension and hopefully that'll fix it.
ahh yes that was the word i was looking for
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Old 03-10-2008, 10:56 AM   #31
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Final update:
  • Clutch: fixed. swapped in a new pressure plate and it's good to go.
  • 3.9 Ring and Pinion: Done. Reused the spacer but it didn't whine much on the freeway so that's cool. also put in the Ben-sourced speedo drive. 3400 @ 70mph.
  • Belt Squeal: fixed. reread the belt tension section of the service manu. tightened it up. silent.
  • Exhaust leak I didn't mention: just had to line up the V-bands better.

so yeah, the car is solid.
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Old 03-10-2008, 11:12 AM   #32
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nice all you need is a video to finish it off with all the new updates
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Old 03-10-2008, 12:05 PM   #33
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great, glad my R&P worked for you!
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Old 03-10-2008, 12:15 PM   #34
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me too. i felt the gas savings already.
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