Texas12R
Zone Head
Posts: 545
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posted July 09, 2007 05:58 AM
 Edited By: Texas12R on 9 Jul 2007 07:03
piston coating
http://www.dowcorning.com/applications/search/default.aspx?R=604EN
I have used the dow 321 on pistons for 550 jet skis, kx 125, 250, kz1000
I had access to an unlimited supply...so why not .
I just cleaned pistons with MEK, masked ring lands and sprayed dry film lube
bake at 300 deg F for one hour.....worked for me
this company has a central warehouse thats practicaly in Buddys backyard
and they have a ceramic coating for piston tops
http://www.techlinecoatings.com/articles/Coating_Pistons_Article.htm
  
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SteddyTeddy
Pro
Posts: 1664
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posted July 09, 2007 11:43 AM
I have checked that site out before. How well has the coating held up? From what I've read they have a different formula for the powdercoat shops. Just wondering how much of a difference there is. I plan on doing my next motor with the dry lube and heat barrier.
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jw
Novice Class
Posts: 81
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posted July 09, 2007 03:53 PM
I've HEARD that the antifriction coatings on the skirts don't last very long. Even the ones the factory puts on. More of a break in coating?
Didn't stop me from putting them on zx11 pistons a few years back.
http://www.swaintech.com/store.asp?pid=10964
They were mostly gone when I tore it down after 3 years I think?
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entropy
Moderator
Posts: 8671
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posted July 10, 2007 02:02 AM
Edited By: entropy on 10 Jul 2007 03:04
I've been reading with interest about various coatings for some time, but always had bigger fish to fry wrt getting my motor set up right.
However, the stroker's persistent skirt scuffing induced me to try a treatment + coating which may help. Got the pistons back yesterday, and will pull my motor down in a couple weeks for build #umpteenth and test em out.
***************************************************************************************
"WPC treatment:
The fine grooves, that are intrinsically engraved into the product surface at the time of machining, are transformed into micro-dimple indentations by the impact of the ultra-fine media during WPC treatment. These dimples then act as oil reservoirs. Thus, oil that would normally drain away, through the grooves in an untreated product, when pressure is applied, is instead retained in the dimples of a WPC treated product. This helps to keep the surface lubricated.
Furthermore, solid lubricants such as Tin (Sn), Molybdenum Disulfide (MoS2) or Tungsten Disulfide (WS2) can be utilized as media in the WPC process to embed them into the product surface. This reduces friction and improves the life and efficiency of the product to an even greater level.
MICRO-RITE Performance Inc. 　Headquarters
2909 Oregon Court, Unit C-2
Torrance, CA 90503
Tel 1.310.782.8647"
***************************************************************************************
Moly and Tungsten coatings require sending the pistons to Japan, so i went with Tin.
We'll see what impact (if any) the WPC+Sn has on scuffing when i pull the motor down for build # umpteenth+1.
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Texas12R
Zone Head
Posts: 545
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posted July 10, 2007 05:08 AM
I wish I had an engine to use as a test bed. I would like to try some of the techline ceramic
and a 100 wet shot. You know.....Just to see when it grenads....it would be interesting to see
if the coatings would save a momentary extreme lean out condition that has caused a few
melt-downs.. Shot-peening would add some toughness to some areas but thats another subject.. 
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psycho1122
Pro
Posts: 1608
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posted July 10, 2007 06:51 AM
Alternative:
When I built my 1270 w/ 14:1 CR, I "bead blasted" my piston tops after removing all thin, sharp casting edges from the valve relief cut outs etc.
This allows a nice even, thin, velvety layer of carbon to build up on top as an insulator.
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You say PSYCHO like it's a BAD thing!!
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