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Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Lizard · Posted: Fri Jun 10, 2011 6:02 am Post subject:

Hope you dont plan on tracking the car with those calipers.
The temp will destroy that coating.....
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3 928s,

bnoon · Posted: Fri Jun 10, 2011 8:01 am Post subject:

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

Looks brand spanking new!

And it still will in ten years.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Harm · Joined: 02 Apr 2009 Posts: 1376 Location: Holland

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

ptheskil · Joined: 03 Aug 2004 Posts: 128 Location: Essex, UK

Lizard may have a point here. It looks like a passivated zinc chromate finish. As a general rule these start to degrade at around 125Celsius.

OEM finishes on mechanical parts are usually only designed to prevent corrosion during the showroom phase of a car's life.

Obviously, the corrosion prevention performance of an individual part will depend on thickness, chemical make-up, service conditions of the part... in question. Check out any OE calipers on most vehicles after about 24months and they don't look good.

Will be interesting to see how these last.
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1981 931 series2 Euro spec

Ian89C4 · Joined: 01 Apr 2011 Posts: 561 Location: North Carolina

Looks great!

Keep us updated on how the finish holds up!

Cheers

Ian
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Ian Edgerly
North Carolina

Current:
1981 924 SCCA/ChampCar Weissach Race Car ("Serenity")
1987 924S ChampCar Endurance Car ("Der Weg")
1980 924 Euro ("Wahala")

Lizard · Posted: Sun Jun 12, 2011 7:55 am Post subject:

Powdercoat has a much higher temp resistance than this Zinc coating.

As well for most from the factory, do you think that they were tracked? No.
For street use, I doubt that it will be a problem. However I also cannot confirm as to the treatment that the calipers got from the factory. But I am pretty sure that they were painted with a high temp paint. Nothing more.

Personally, I would consider a ceramic coating on all the caliper parts to help try to prevent heat transfer.
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3 928s,

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I have been using ceramic bake on spray paint on my calipers. You just stick it in the oven for an hour after the paint dries and it becomes chemical and heat resistant.
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87 924s
88 924SE gone
447 hp cgt clone
87 924S gone
84 944 sold
83 944 sold
89 turbo S LSD, ABS etc
86 951 white rocket
85 944 sport everything.
84 944 sold.
87 944 sold

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

ptheskil · Joined: 03 Aug 2004 Posts: 128 Location: Essex, UK

Fair play. One to you!

Disc is looking a bit thin though - time for a replacement.
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1981 931 series2 Euro spec

agfisher · Joined: 09 May 2007 Posts: 483 Location: West Hartford, CT

I've been thinking about picking up the Eastwood plating kit to do this myself at home. Are there certain metal bits that you should not plate? I remember in another thread that plating can change the way a bold torques. This would give me pause in plating anything critical that I would have to torque.

In addition I have a vibratory tumbler that cleans and polishes stuff up to 10 inches long. I'm thinking I should be able to do that and plate them right after.
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1977 924 N/A Martini Edition

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands