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Author Topic: ACT PP lasts handful of laps
Sphinx Verified Driver
M. Yusuf Mohamed

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Need a little help. What would cause this to happen to a pressure plate? This plate lasted a whole 3-5 laps. If you've followed my other plate on bleeding the hydraulics, this is the reason the clutch wasn't properly working. Of course, the throwout & pilot bearings were brand new. The throwout bearing is now toast.

According to the part number on the box, it's the right one. But if you'll compare the diameter of the whole in the middle, it looks like there's a difference, with the ACT being a little bit bigger. If that's the case, it looks like the throw-out bearing wouldn't get a good surface on the PP.

Any clues would be great, as we're trying to get the car ready to run an enduro on Sunday.

http://forum.specmiata.com/files/00000161/IMAG0064-2.jpg

http://forum.specmiata.com/files/00000161/IMAG0062-2.jpg

http://forum.specmiata.com/files/00000161/IMAG0063-3.jpg

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Sphinx Racing
Atlanta Region
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John A - 5X Racing Verified Driver
www.5xracing.com

Region: NASA FL / CFR SCCA
Car #: 25
Year : 1991
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What is the ACT part number on the box? There are two versions of ACT pressure plates, an "HD" and "Xtreme", with the Xtreme being a higher pressured plate for increased holding power. Don't think it would cause this, but you never know.

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John Adamczyk

Owner: 5X Racing Online Race Shop
Driver: Team 5X Racing #25 Spec Miata
NASA FL Race Director
Race Engineering Powered 1.6

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by John A - 5x Racing:
What is the ACT part number on the box? There are two versions of ACT pressure plates, an "HD" and "Xtreme", with the Xtreme being a higher pressured plate for increased holding power. Don't think it would cause this, but you never know.

MZ014 is on the box and cast into the PP. That's supposed to be the Heavy Duty for a 1.6L. Came from Mazda Motorsports by way of a local SM prep shop.

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Sphinx Racing
Atlanta Region
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Alex Gaines Verified Driver
Member

Region: Central Carolina
Car #: 77
Year : 1990
Posts: 59
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Have the clutch disk in backwards?

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2010 SARRC Champion
2010 13 Hours of VIR Champions
Race Engineering

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Alex Gaines:
Have the clutch disk in backwards?

Definitely not. I didn't think that you could even install a disk backwards and have the PP go one correctly.

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Sphinx Racing
Atlanta Region
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Chris Haldeman
Member

Region: texas
Car #: 71,72
Year : 1990,1999
Posts: 166
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i heard awile back there was some problems with that very thing.your pressure plate must have been from the bad batch.i bet if you order a new one there will be a smaller hole in the center.

MazdaSteve Verified Driver
Member

Region: CCR
Car #: 14 SM
Year : 1990
Posts: 36
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What did the local SM prep shop say?

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Seneca Motorsports
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Dan Tiley Verified Driver Series Champ
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Region: SEDIV
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Here's some possibilities, mostly T/O bearing related:

1) T/O bearing was installed backwards
2) fingers on the fork not correctly centered between the "ears" of the T/O bearing
3) T/O bearing guide sleeve damaged, or bent.
4) Clutch fork not snapped onto the pivot ball

For what it's worth, I never use the ACT PP. I use the Mazda OEM PP with the ACT 4-puck unsprung disc. It's much cheaper, and offers considerably lighter pedal efforts. You only need the HD PP for boosted or otherwise significantly HP enhanced engines. I've never had any issues with that combination. Good Luck!

--------------------
Dan Tiley

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Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Chris Haldeman:
i heard awile back there was some problems with that very thing.your pressure plate must have been from the bad batch.i bet if you order a new one there will be a smaller hole in the center.

Might have a winner, awaiting confirmation by ACT. The hole across the center is supposed to measure 1.5". Mine measures 1.75". ACT just asked for a picture showing the measurement, which I've already provided.

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Sphinx Racing
Atlanta Region
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Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by Dan Tiley:
Here's some possibilities, mostly T/O bearing related:

1) T/O bearing was installed backwards
2) fingers on the fork not correctly centered between the "ears" of the T/O bearing
3) T/O bearing guide sleeve damaged, or bent.
4) Clutch fork not snapped onto the pivot ball

For what it's worth, I never use the ACT PP. I use the Mazda OEM PP with the ACT 4-puck unsprung disc. It's much cheaper, and offers considerably lighter pedal efforts. You only need the HD PP for boosted or otherwise significantly HP enhanced engines. I've never had any issues with that combination. Good Luck!

When you say the stock PP plate, are you referring to the one that comes with the "Value Clutch kit" for ~$100 for everything? Or something else? Value Clutch Kit

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Sphinx Racing
Atlanta Region
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trimless1 Verified Driver Made Donation to Website
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Region: Southwest
Car #: 11
Year : 99 and 93
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Rules only allow for the ACT or OEM pressure plate. The value line PP is not OEM so it would not be legal for SM. The OEM PP is avalaible for about $75 through Mazda Motorsports.

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Gale Corley
99 SM GRE Super Deluxe
93 SM GRE Jr. Deluxe

Sphinx Verified Driver
M. Yusuf Mohamed

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quote:
Originally posted by trimless1:
Rules only allow for the ACT or OEM pressure plate. The value line PP is not OEM so it would not be legal for SM. The OEM PP is avalaible for about $75 through Mazda Motorsports.

At $75, not sure it matters - so, this question is mostly academic for the rules wonks. But the Value kit is an OEM Mazda part, comes in a mazda box and everything.

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Sphinx Racing
Atlanta Region
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trimless1 Verified Driver Made Donation to Website
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If it was or was not legal to run certainly could be up for debate but why risk it? Do you want to run a cheap "value line" part in such a critical component? Really??

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Gale Corley
99 SM GRE Super Deluxe
93 SM GRE Jr. Deluxe

Dan Tiley Verified Driver Series Champ
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Region: SEDIV
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quote:
Originally posted by trimless1:
If it was or was not legal to run certainly could be up for debate but why risk it? Do you want to run a cheap "value line" part in such a critical component? Really??

Yes, really. Heck, after reading Sphinx's post and looking at his pictures, it seems to me the "risk" is with the expensive ACT PP [Smile] I've never had an issue with the OEM plate and ACT disc combo. Clutch pedal efforts are lighter, it's much cheaper, and when used with the ACT 4 puck disc, it has more than enough torque capacity. In my book, that's a win-win-win. [thumbsup]

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Dan Tiley

Sponsored by Race Engineering

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trimless1 Verified Driver Made Donation to Website
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Car #: 11
Year : 99 and 93
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Dan,

I agree the OEM clutch PP is fine. My "really" comment was for the value line PP. I'm assuming you do not run the value line. If you do, glad to hear it works for you!

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Gale Corley
99 SM GRE Super Deluxe
93 SM GRE Jr. Deluxe

CP Verified Driver
Member

Region: NER
Car #: 7
Year : 1999
Posts: 636
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Which weighs less?

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-Cy
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Rt1 AutoMile - Norwood, MA
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