Re: Piston skirt coatings worth applying?
[Re: BradH]
#890158
12/28/10 03:34 PM
12/28/10 03:34 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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E booger years back done a artical in Mopar Action about a Rattle coat moly spray. I asked him years later about the application, and part number.... Maybe some one might have that article? This coating if for a dry startup, engine break in. It goes away pretty quickly after intial startup. I dont think a expensive coating on the skirts is worth the money, maybe on the top of the pistons etc, but not the sides. ![](/ubbthreads/images/graemlins/Twocents.gif)
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Piston skirt coatings worth applying?
[Re: dannysbee]
#890162
12/28/10 04:21 PM
12/28/10 04:21 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
The true question here is, will the wife let you use her oven to cure the coatings. Better talk to her first.
Oh, no... I've seen first hand what happens when those "apply at home" coatings were used on some valves. ![](/ubbthreads/images/graemlins/puke.gif)
Any coatings I'd use in the future would be applied by somebody to whom I can hold accountable.
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Re: Piston skirt coatings worth applying?
[Re: quick77rt ]
#890166
12/28/10 07:28 PM
12/28/10 07:28 PM
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Joined: Jan 2003
Posts: 9,888 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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If coatings help maintain thermal stability by alleviating hot spots, the long term durability/reliability pays off though it might not show up in 'net' HP. Enbgine masters used to be but is no longer relevant to anything "real world"....e.g., 3 foot deep belly pan oil sumps, deck spacers with sleeves (Kaase actually tried to pass-off as "head gaskets" ![](/ubbthreads/images/graemlins/grin.gif) ) aimed at maximizing strokes/rod lengths, etc. Entertaining but on the whole useless to the regular guy because they never publish any of the really interesting stuff in any significant detail. ![](/ubbthreads/images/graemlins/eyes.gif) I'm pretty impressed with the fit and finish of the Mahle Coated pistons in my 414, I could have opted for the standard Diamond/Ross/JE's of scores of builds past but I wanted to try something different. ![](/ubbthreads/images/graemlins/shruggy.gif) And the pricing was attractive and they were locally (NC) manufactured. (Where's the American flag emoticon?) Time will tell but companies have poured 10's of millions into the development of some of these coatings, I'm sure much (if not all) of the technology has spun-off/trickled down from NASA, it's not too far fetched to expect mass-produced ceramic based pistons and perhaps valvetrain components displacing metal based alloys in the not too distant future. As for skirt scuffing well...you basically rely on "random" oil slinging to protect the piston and bore surfaces, there's a reason modern engines and race motors have strategic oil 'jets' and dedicated hydrualic oil control systems. No doubt you can do a lot more with a lot les.....if it's surgically applied and tested.
Last edited by Streetwize; 12/28/10 07:34 PM.
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Re: Piston skirt coatings worth applying?
[Re: 602heavy]
#890172
12/28/10 08:23 PM
12/28/10 08:23 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Quote:
My 452's Ross pistons had some noticeable scuffing on the skirts due to being run w/ too little oil.
How did you come to this conclusion? ![](/ubbthreads/images/graemlins/popcrn.gif)
Punch in this search exactly and start reading the posts returned beginning approx. 11/16/2009. I'm not going thru it all over again...
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Re: Piston skirt coatings worth applying?
[Re: quick77rt ]
#890174
12/28/10 08:31 PM
12/28/10 08:31 PM
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Joined: Sep 2003
Posts: 2,175 Duloc
The Shadow
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,175
Duloc
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Don't fear the coating ![](/ubbthreads/images/graemlins/thumbs.gif) It will help with scuffing and clearance issues. Call swain tech if you want the real ![](/ubbthreads/images/graemlins/Twocents.gif) I would imagine it wont be long before cp, diamond, and the other mfgs offer coatings. BTW getting some heat into the motor before beating on it will reduce scuffing.
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Re: Piston skirt coatings worth applying?
[Re: BradH]
#890176
12/29/10 12:22 AM
12/29/10 12:22 AM
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Joined: Aug 2003
Posts: 43,283 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,283
Bend,OR USA
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I have several engines with Ros pistons, I think there alloy(piston skirts ![](/ubbthreads/images/graemlins/confused.gif) ) is very soft ![](/ubbthreads/images/graemlins/Twocents.gif) ![](/ubbthreads/images/graemlins/shruggy.gif) Especially their close tolerance alloy ![](/ubbthreads/images/graemlins/1343795-scratchchin.gif) I'm using Diamond pistons now with their close tolerance alloy with a lot better results ![](/ubbthreads/images/graemlins/thumbs.gif) On second thoughts maybe Ross alloys are to hard ![](/ubbthreads/images/graemlins/confused.gif) Resulting in scrathing up the cylinder walls and piston skirts ![](/ubbthreads/images/graemlins/shruggy.gif)
Last edited by Cab_Burge; 12/29/10 12:24 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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