924Board.org

flosho · Posted: Tue Feb 22, 2011 11:24 am Post subject: Clutch talk

Does anyone have the link saved with the 911 pressure plate that works for the 931?

I'm fixing to use a spec stage 2+ bronco II clutch disk and 911 pressure plate, resurfaced oem flywheel.. is that crazy?
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Grenadiers · Posted: Tue Feb 22, 2011 11:40 am Post subject:

Here's one:

http://www.924board.org/viewtopic.php?t=27490&highlight=pressure+plate
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

flosho · Posted: Tue Feb 22, 2011 11:44 am Post subject:

Score, thanks Dave.

Did you end up purchasing a 911 pp? The ebay link Dan posted is NLA. So the part number for the aluminum/iron version isn't available there.
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Grenadiers · Posted: Tue Feb 22, 2011 11:50 am Post subject:

No I haven't, mine still works.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

joe b · Joined: 16 Sep 2010 Posts: 131 Location: McKinleyville, CA

Trying to sift through all of this information, but I am kind of a noob.

I'm looking for a clutch kit for my '80 931, which I'm VW flat tops in, as well as probably a boost controller. Just wondering what kit they recommend I buy. I am not sure how much extra power I'll be getting with these mods, or how much power the SACHS clutch kits are rated for.

I'd really appreciate some links to look at. I would prefer to keep it cheap if I can, but then again I don't want to find myself having to do another clutch job in the too-near future.

Any recommendations?
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1980 931

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

The hybrid alloy-iron version of the 915 pressure plate is 915.116.001.16

They are NLA new from Porsche, and I have been unsuccessful finding an aftermarket equivalent. The .27 all iron version is readily available and increases the clamping force, don't recall off hand by how much, but it seems like a reasonable upgrade for minimal cost on a modified '31.

Not sure the Stage II disc is really required, especially on a street car. The folks I discussed this with urged me to stay with the stock disc and just use the 915 pressure plate.

Just make sure you're absolutely certain which version of the flywheel you have before investing in clutch components. I've been hesitant to order from Spec because I'm not 100% certain they are aware of the variations...encountered this problem with Fidanza...so a call or two to Spec would be advisable before you spend $$$.

There are three versions of the flywheel I am aware of:

Flywheel 931.102.205.05 M31.01/02, model years 1979-1980 : will fit (spring-damped) clutch plate 931.116.011.04 and pressure plate 931.116.001.02
Flywheel 931.102.206.01 M31.03/50 81-onward : will fit (spring-centered) clutch plate 931.116.011.04 and pressure plate 915.116.001.27/16
Flywheel 931.102.206.03 M31.04 81-onward : will fit (rubber-damped) clutch plate 944.116.012.04 and pressure plate 931.116.001.3

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erstwhile owner of just about every 924 variant ever made

leadfoot · Posted: Thu Feb 24, 2011 7:55 pm Post subject:

suppose it's all determined on what your trying to achieve...
206.01 flywheel with the 911SC all aluminium pressure plate and clutch will work, but you have to drill out the clutch rivots and replace the centre section (which is a 20mm diameter spline) and replace it with your old spring clutch spline centre.
Once you drill out the old rivots send an M4 or M5 tap down the hole for some bolts.
Note that the new clutch has double springs ( inner and outer )
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

flosho · Posted: Fri Feb 25, 2011 7:18 am Post subject:

Well, I'm going to need a clutch disc that can take some punishment.

The last OEM clutch took plenty of punishment but after pulling it out, it was quite clear that it was slipping... a lot.

Autocross/HPDE/Drag Racing(gasp!) is in it's future.

I may even attempt to use my launch control this summer... I was to afraid to launch with it last summer...
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joe b · Joined: 16 Sep 2010 Posts: 131 Location: McKinleyville, CA

There's a company in California called South Bend Clutch, and while their website is crap, my friends around here say their clutches never slip. I called and one for the 931 would cost $750 apparently.
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1980 931

leadfoot · Posted: Thu Apr 28, 2011 3:07 pm Post subject:

http://cgi.ebay.com/ebaymotors/SACHS-RACING-POWER-CLUTCH-KIT-Porsche-911-911S-911T-72-/330552851454?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cf67c3bfe#ht_2155wt_725
No affiliation, this is the all aluminium pressure plate, as mentioned you need swap out the splined centre with your previous disc centre as it has 20 splines. This is fairly easy to do, I used the 206.01 flywheel in this setup.
Be able to give a good comparison when Scorpio gets his car on the road as he has a spec stage 2 IIRC. Stu
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

leadfoot · Posted: Fri Jul 15, 2011 10:53 am Post subject:

OK think I messed up with my info, going to go and edit the old posts now too...
Also it took ages to find this, so save a copy....
http://clutchworld.net/pic/pdfcatalog-file1.pdf

From looking there is only one power clutch kit available
PC200-1 and comes with a 20T spline centre
which another board member and myself have veified you can change your old splined hub out for... drill out the old rivots and either use new heavy duty rivots or drill and tapp the lugs and fit with bolts, I went with an allen key head on mine (20mm length IIRC)

you also swap in the 4 new dual springs for the old hub springs and rplace You can't use the new throwout bearing either.
So what you get is a new clutch and an aluminium pressure plate that's 3lb lighter than stock and has double the clamping force.

As far as pressure plates, to make it clear the model that goes with the rubber centred clutch and pressure plate 206 .03 CANNOT be used

You have to USE the pressure plate that goes with a spring centred clutch. 206.01

to help identify the flywheel clutch combo -
with the rubber clutch the 206.03 flywheel pressure plate will have a positve offset, i.e around the lip which bolts to the flywheel the gripping face extends beyond the lip.
206.01 flywheel and spring centred clutch the pressure plate will have a negative offset of 5mm on the gripping face.
regards
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

The 205.05 and 206.01 flywheels use the same pressure plate and spring-centered clutch disc, so the PC200-1 pressure plate should work with either arrangement. If you have a 1982 S2 with an M31.04 engine code, the PC200-1 won't work for it, as that is the engine that came with the 206.03 flywheel.

More to add but gotta run just now...
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erstwhile owner of just about every 924 variant ever made

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

What I was going to add is that it would be interesting to find out if you could purchase ONLY the pressure plate from this kit, then source the OEM clutch disc and throw-out bearing separately.
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erstwhile owner of just about every 924 variant ever made

leadfoot · Posted: Sat Jul 16, 2011 11:27 am Post subject:

EBS have these from kennedy engineering,
http://www.ebsracing.com/item.wws?sku=901116001LWK-1&mfr=KEP
Stu
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...