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PanamaCarrera
Joined: 13 Mar 2012
Posts: 81
Location: Southport, UK
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 Posted: Thu Nov 08, 2012 2:51 pm Post subject: Engine paint |
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Does anybody know what colour the iron block was painted at the factory?
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Nigel Walker |
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!tom
Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada
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| Posted: Thu Nov 08, 2012 4:32 pm Post subject: |
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It wasn't.
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78 924 NA
5-lug |
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daniel
Joined: 18 Jun 2009
Posts: 686
Location: Sydney, Australia
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| Posted: Thu Nov 08, 2012 7:24 pm Post subject: |
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I have three blocks, all are black
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Thu Nov 08, 2012 9:45 pm Post subject: |
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| daniel wrote: | | I have three blocks, all are black |
i have two, none are painted.
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Thu Nov 08, 2012 10:32 pm Post subject: |
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None of my blocks have ever come painted.
On a related question, it would be interesting to know if the factory used any sort of corrosion preventive on the iron blocks. Once cleaned, they begin to rust very quickly on the bench (in my experience), but most of the ones I've pulled out had very little rust or corrosion.
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Thu Nov 08, 2012 10:50 pm Post subject: |
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well they are not quite Iron...they are a high carbon content alloy...so the rust is just surface rust..it takes quite some enviroment to rust those things badly. If oiled a bit and not rained on they will last forever.
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Thu Nov 08, 2012 10:56 pm Post subject: |
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The machined surfaces will rust very quickly, and can get pitted if not properly protected (I usually use assembly lube for long periods of storage).
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erstwhile owner of just about every 924 variant ever made |
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Fri Nov 09, 2012 3:37 am Post subject: |
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I read Porsche motorsport would leave bare blocks outside in all elements and occaissionally technicians would pee on them. Apparently to 'condition' them ready for abuse in their cars!! And no, its not 1st April!!
My block is being redone by my engine shop. I know for a fact he can't remember whether he's painting it black or red. It's gonna be a lottery what I'll get back 
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Fri Nov 09, 2012 3:53 am Post subject: |
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Bright/Light colors are lot better for quickly identifying any oil leaks...
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erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Fri Nov 09, 2012 4:18 am Post subject: |
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| ideola wrote: | | most of the ones I've pulled out had very little rust or corrosion. |
That's because they have a built-in feature that continuously soaks the block with a fresh film of engine oil.
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Fri Nov 09, 2012 4:52 am Post subject: |
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| Rasta Monsta wrote: | | That's because they have a built-in feature that continuously soaks the block with a fresh film of engine oil. |
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!tom
Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada
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| Posted: Fri Nov 09, 2012 5:55 am Post subject: |
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| Carrera RSR wrote: | | I read Porsche motorsport would leave bare blocks outside in all elements and occaissionally technicians would pee on them. Apparently to 'condition' them ready for abuse in their cars!! And no, its not 1st April!! |
This is standard procedure for engine block castings. After they've sat outside for a bit, they're inspected for cracks which are caused by casting flaws, which are far more evident with a little bit of rust outlining them.
Perhaps nowadays more fancy technology is used to the same end, but this is/was hardly unique to Porsche.
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78 924 NA
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!tom
Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada
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| Posted: Fri Nov 09, 2012 5:56 am Post subject: |
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| Rasta Monsta wrote: | | ideola wrote: | | most of the ones I've pulled out had very little rust or corrosion. |
That's because they have a built-in feature that continuously soaks the block with a fresh film of engine oil. |
That's what I was going to say!
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78 924 NA
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PanamaCarrera
Joined: 13 Mar 2012
Posts: 81
Location: Southport, UK
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| Posted: Fri Nov 09, 2012 10:16 am Post subject: |
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Thanks for all the responses guys.
I'm going to have to be careful when I start dismantling the engine.
Nothing stays dry for very long in Panama!!!
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Nigel Walker |
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