Dry Moly Spray
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West South Central Moderator
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From: Kilgore TX 75662
Dry Moly Spray
Where I work, we have spray-on dry moly lube. I was wondering if it would be a bad idea to put a thin coat of it on maybe crankshaft journals, bearings and maybe even the camshaft? I don't know how thick it goes on, but I could sand it down to an even finish after applying. Maybe I should spray some on a test piece and measure it before and after..
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Joined: Jul 2003
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From: Southern California
I'm not sure of the precise composition and practical application of "dry moly" but there's something a little alarming about the concept of "abrasive" anything on bearings not to mention the use of sandpaper on crankshafts or camshafts. Don't think I'll be using anything like that until I begin to experience catastrophic failures related to the use of regular assembly lubes and/or motor oil during assembly.
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Joined: Feb 2001
Posts: 878
From: Clovis, NM
I have some of that also.
I would never use it in side an engine. It is great for coating breaks and no I'm not talking about the rotor and pad surfaces.
That stuff is great for any kind of place where you need lube but dirt would stick to and build up any oil or grease very quickly.
It sticks to metal a lot better than paint.
I would never use it in side an engine. It is great for coating breaks and no I'm not talking about the rotor and pad surfaces.
That stuff is great for any kind of place where you need lube but dirt would stick to and build up any oil or grease very quickly.
It sticks to metal a lot better than paint.
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West South Central Moderator
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From: Kilgore TX 75662
On the can it says that it's an industrial collodial molybdenum disulfide that withstands heavy pressures and high temperatures, minimizes metal-to-metal contact, outlasts graphite, and is non-greasy. Ends sticking problems and preserves friction points, frees frozen surfaces. Withstands oils, alkalis, and most acids. Will not attract dust, and prolongs life of bearings, cams and gears. Lubricates: Mining and construction machinery, automotive engines and bearing surfaces, printing presses, vending machines, pump assemblies, high-speed gears and chains, etc, etc.
Contains: Trichloroethylene; 79-01-6
Isopropyl Alcohol; 67-63-0
Isobutane; 75-28-5
Propane; 74-98-6
n-Butane; 106-97-8
Contains: Trichloroethylene; 79-01-6
Isopropyl Alcohol; 67-63-0
Isobutane; 75-28-5
Propane; 74-98-6
n-Butane; 106-97-8
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West South Central Moderator
Joined: Oct 2000
Posts: 3,371
From: Kilgore TX 75662
Molybdenum Disulfide Solid Film Lubricant
BENEFITS: Dry-film lubricant that withstands high temperatures and pressures. Protects metal surfaces from rusting and corrosion by displacing moisture. Treated surfaces withstand water, oil, alkalis and most acids. Reduces metal-to-metal contact on highly machined surfaces. Convenient long-lasting aerosol sprays a thin, black coating that adheres readily and dries within seconds. Contains colloidally-dispersed molybdenum disulfide in a non-oil base.
It specifically mentions automotive engines and bearing surfaces. I know that flat tappet cams and some bearings often have a dry-moly film applied. This sounds like similar stuff.
I have half a mind to go ahead and try it just to see what happens
BENEFITS: Dry-film lubricant that withstands high temperatures and pressures. Protects metal surfaces from rusting and corrosion by displacing moisture. Treated surfaces withstand water, oil, alkalis and most acids. Reduces metal-to-metal contact on highly machined surfaces. Convenient long-lasting aerosol sprays a thin, black coating that adheres readily and dries within seconds. Contains colloidally-dispersed molybdenum disulfide in a non-oil base.
It specifically mentions automotive engines and bearing surfaces. I know that flat tappet cams and some bearings often have a dry-moly film applied. This sounds like similar stuff.
I have half a mind to go ahead and try it just to see what happens
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Joined: Nov 1998
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From: Hell was full so they sent me to NJ
A quick search indicates that its mainly used as an assembly lubricant and break-in lubricant. Usefulness in an automotive environment, such as a piston skirt would appear to be somewhat limited, because it appears to break down above 842*F. The source linked below indicates a 400*F max application temp:
http://www.metcoat.com/molybdenum.htm
The other concern would be particle size.... is it going to plug things up as it comes loose? The tech data sheets appear to indicate an 0.5mil film thickness, so you might end up with particles that thick floating through the engine. That was the big problem with "teflon" type lubricants, as useless as they are in an engine, they would plug up passages and filters.
Molybdenum disulfide is not an abrasive. From Wikipedia:
I suspect that the moly coatings applied to piston skirts may be the ones decribed in the Wikipedia article, and are much more complex than simple "dry moly lube":
From the Swain coatings site:
http://www.metcoat.com/molybdenum.htm
The other concern would be particle size.... is it going to plug things up as it comes loose? The tech data sheets appear to indicate an 0.5mil film thickness, so you might end up with particles that thick floating through the engine. That was the big problem with "teflon" type lubricants, as useless as they are in an engine, they would plug up passages and filters.
Molybdenum disulfide is not an abrasive. From Wikipedia:
The structure, appearance, and feel of molybdenum disulfide is similar to graphite - a sandwich of layers of molybdenum atoms between the layers of sulfur atoms. Due to the weak interactions between the sheets of sulfide atoms, MoS2 has a lubricating effect. Finely powdered MoS2 with particle sizes in the range of 1-100 µm is a common dry lubricant.
Self-lubricating composite coatings for high temperature applications were developed at the Oak Ridge National Laboratory. A composite coating of molybdenum disulfide and titanium nitride was created on the surface of parts by chemical vapor deposition.
Piston Skirts
Poly Moly™ Solid Film Lubricant:
In addition to power being lost through heat, power is also lost due to excessive friction. Poly Moly™ has
an extremely low coefficient of friction, reduces scuffing caused by piston movement and provides back-up lubrication if your primary lubrication fails or has gone beyond its load limits.
Unlike the simple “break in” skirt coatings that are now being offered
by piston manufacturers and OEM’s, Poly Moly™ is designed to be a permanent solid film lubricant coating.
PC-9™ Solid Film Lubricant:
PC-9™ is Swain Tech’s latest generation of piston skirt coating. PC-9™ has the same low friction properties of Poly Moly™, but PC-9™ is even tougher.
As part of Swain Tech’s continued commitment to product development, PC-9™ has been engineered to meet the demands of today’s high revving, short piston skirt, and long rod motors. PC-9 works well with nickasil, chrome or iron cylinder bores.
Poly Moly™ Solid Film Lubricant:
In addition to power being lost through heat, power is also lost due to excessive friction. Poly Moly™ has
an extremely low coefficient of friction, reduces scuffing caused by piston movement and provides back-up lubrication if your primary lubrication fails or has gone beyond its load limits.
Unlike the simple “break in” skirt coatings that are now being offered
by piston manufacturers and OEM’s, Poly Moly™ is designed to be a permanent solid film lubricant coating.
PC-9™ Solid Film Lubricant:
PC-9™ is Swain Tech’s latest generation of piston skirt coating. PC-9™ has the same low friction properties of Poly Moly™, but PC-9™ is even tougher.
As part of Swain Tech’s continued commitment to product development, PC-9™ has been engineered to meet the demands of today’s high revving, short piston skirt, and long rod motors. PC-9 works well with nickasil, chrome or iron cylinder bores.
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