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starfire
PostPosted: Sat Jun 11, 2011 7:04 pm 
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Jim wrote:
I believe that piston coatings are usually a slippery, friction-reducing coating on the sliding surfaces, and/or a heat barrier coating on the top, a ceramic for example.

Yes, the anodic coating of aluminum oxide you get when you anodize aluminum is one of the most common ceramics, alumina.

OR.... the slippery coating is caused by the etched and porous surface holding more oil film. ... :D

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Jim
PostPosted: Sat Jun 11, 2011 7:12 pm 
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I think the slippery coatings use materials like molybdenum disulfide. Maybe we could squeeze some information from our resident Wössner guy.

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starfire
PostPosted: Sat Jun 11, 2011 7:18 pm 
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Jim wrote:
I think the slippery coatings use materials like molybdenum disulfide. Maybe we could squeeze some information from our resident Wössner guy.

Many of the "coating" websites specifically mention ceramic. What easier way to coat a piston than to throw it in an anodising bath.? I would definitely put money on it thats its the same process. However.... this was about anodising for cosmetics, this is where the interest lays for triple owners. Can I suggest anyone who tries this post their results...good or bad, this would be very useful to all, and become a good knowlege base for the resource site. Forget the bloody pistons, thats going nowhere.

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Jim
PostPosted: Sat Jun 11, 2011 7:33 pm 
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starfire wrote:
Many of the "coating" websites specifically mention ceramic.

Yes, as I said, I think you'll find that the ceramics are applied to the piston crown. Maybe you should anodize some motorcycle pistons and run a test.

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starfire
PostPosted: Sat Jun 11, 2011 7:42 pm 
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Jim wrote:
starfire wrote:
Many of the "coating" websites specifically mention ceramic.

Yes, as I said, I think you'll find that the ceramics are applied to the piston crown. Maybe you should anodize some motorcycle pistons and run a test.

I would really like to anodise certain people at times Jim.... especially the argumentative ones. :P Perhaps you would like to try this yourself , and convince yourself of the extremely remote possibilty that I may actually be right about something? :D

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Jim
PostPosted: Sat Jun 11, 2011 7:59 pm 
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Argumentative? Actually, I was replying to John's question about anodizing pistons, and you disagreed with what I said. I have beer to make, which is way more important than this.

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starfire
PostPosted: Sat Jun 11, 2011 8:13 pm 
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Seems we will never know. Bugger. :lol:

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starfire
PostPosted: Sat Jun 11, 2011 8:47 pm 
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starfire wrote:
Seems we will never know. Bugger. :lol:

Or maybe we will. Look at this:
http://www.powder365.com/forum/viewtopi ... =13&t=2175
http://www.flightglobal.com/pdfarchive/ ... 01982.html
Jim, this last link is interesting... it gives the complete process. Seems the acid/battery charger process is followed, then the piston is immersed and boiled in oil. The oil is absorbed into the ceramic and stays there. This was done in aircraft engines during the war.
I reckon its worth doing, specialy with 2 strokes with their marginal lubrication. Interesting too the reference to reduced cylinder scoring.

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