Moly coating on pistons / bearings?

[Jonathan Erwin]

I found this on HPC ceramics site:

quote:

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Our S01 is applied to the skirts of the piston to reduce friction and prevent scuffing. This wettable matrix coating is a Molybdenum Disulfide based coating rather than PTFE. Moly is a higher pressure lubricant and does not "cold flow" under pressures exceeding 150,000 psi. Also Moly attracts oil keeping an adequate film of oil on the part. PTFE will shed oil and thus becomes the only lubricant between the piston and the cylinder wall. The Moly is suspended in a thermosetting polymer binder which hardens during curing providing a permanent lubricant unlike break-in Moly sprays. S01 can also be applied to the stem of the valve to reduce friction and wear. Engine bearings are another excellent application for HPC's S01 coating.

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It sounds like a good idea but what is the general census on doing this?

You can see it here:
http://www.hpcoatings.com/engine_coatings.htm

 

[MolaKule]

It makes sense.

Moly has been used as a coating for piston rings or alloyed with chromium and iron in piston rings for years to reduce friction and wear.

[ April 05, 2003, 02:58 PM: Message edited by: MolaKule ]

 

[unDummy]

Great idea but expensive if done on all engine components. Some automakers use various coatings on pistons, valves, bearings, and cylinder walls already which helps eliminate wear or improve performance.

Others:
http://www.swaintech.com
http://www.polydyn.com
http://www.techlinecoatings.com
http://www.usnicom.com
http://www.custom-coatings.net/automotive.html
http://www.extremeperformancecoatings.com/Performance.htm
http://www.powerkote.co.za/coatings.htm

 

[Jonathan Erwin]

About how much do they charge to do a set of pistons?

 

[Alex D]

Harley Davidson begun sometime in 1996 to coat their Big Twin pistons with this stuff and and they are doing it to this day.