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11-01-2020, 12:48 PM #106
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keefallan thanked for this post
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11-01-2020, 02:21 PM #107
Keef ,
The pistons you have are .. one step up from the standard.
Their skirt coating is good. No need to do the pin bore area, no thrust load there.
Looks like they did the crown , then did final machining to the top.
I wouldn't look to "lap' the coatings , just tape right up to the other blast and spray.
Might wanna paper and tape around the ring and skirt area ..to protect it from the blasting and coating ... The crown coating is heat reflective , not a dry film lube ..
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keefallan thanked for this post
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11-01-2020, 02:57 PM #108
I have a question? Is the Skirt coating below the freshly machined Skirt surface? If so Its designed purpose is only 1/2 of what it was intended for.
As far as the Tops. I know exactly what that is. And its worthless as Tits on a Bore HOG!!!. I say that because exactly whats its purpose? The MFG coated the piston and then finished machining. Man It looks COOL and the Customer will be Impressed SMFH!!!
Place some High quality high adhesive tape on the coatings and see if it come off when the tape is yanked off. High Heat 500 deg tape is what I use. If it stays on then the substrate was properly prepped and the coating applied correctly. if not. Start from scratch.
Bud Conner "Heathen" "Defending Our Constitution"
FOR ALL ENGINE APPLICATIONS
DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!
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Merc 2.5 liked this post
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11-01-2020, 03:29 PM #109Scream And Fly VIP
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Bud, the skirt machining is covered by their film. The machining goes halfway down to the wristpin bore and then stops. Both you and Chaz confirmed what I thought.........that they coated it(the top) and then finished machining the crown later. And that was my question even though I didnt ask it.........what good is the coating if it leaves 20-30 percent of the crown raw?
So Chaz and Bud, I genuinely thank you for your input. It was what i needed to know. I will check adhesion tomorrow at work and go from there.
Here's the bigger irony. I have had these pistons since the summer........before I had my block machined. I never pulled 'em out of the box till yesterday when I went to coat them...........DOH!! "I tell ya boy, you're about as shop as a bowlin' ball".......Foghorn Leghorn
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11-02-2020, 09:31 AM #110
In looking at the picture it looks like what is shown of the skirt coating has to be below the machined skirt surface. I see what appears to be a 3/16" freshly machined band just under the lower ting land. Then the Freshly machined area down the Wrist pin area, then a 1/8" freshly machined band at the Skirts Base. So Is the Coated Skirt area on Both sides below the machined surfaces?
Bud Conner "Heathen" "Defending Our Constitution"
FOR ALL ENGINE APPLICATIONS
DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!
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11-02-2020, 12:42 PM #111Scream And Fly VIP
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11-02-2020, 12:53 PM #112
Milling??? That makes absolutely No sense. The areas im referring to are clearly machined by a lathe. Had the wrist pin areas been machined on a mill they would be flat vs a radius. I dont think youre following my questions. Look atn the Skirt coated area and the Freshly machined areas. Let me put it this way. Is the coated area on the Skirts and the Frshly machined areas on the Skirts on the Same plane? Or is one lower or higher then the other?
Bud Conner "Heathen" "Defending Our Constitution"
FOR ALL ENGINE APPLICATIONS
DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!
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11-02-2020, 01:07 PM #113
Took me a minute to realize what Bud was getting at too. What he wants to know is if the coated areas on the skirt are recessed, or the same height as the rest of the piston.
www.InjectorService.com
Call/Text - 204-326-0390
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11-02-2020, 01:16 PM #114Bud Conner "Heathen" "Defending Our Constitution"
FOR ALL ENGINE APPLICATIONS
DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!
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11-02-2020, 02:02 PM #115Scream And Fly VIP
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Bud, you have to understanding I have actually been milling most of the day.......so it was on my mind when I wrote the blog (as I ran out the door, pressed send and ran out the door kinda thing)
I Understand Now after re-reading what you were saying. To me, I have a machined portion and a raw aluminum portion on the piston side. The one half has zero machining marks........and that is what made me think the direction I did.....and I took the machining to be the upper half. OH well.
Bud, the coating is higher than the other and they had to use a stencil......aint no way a masker could do it that perfect. Sorry for the mix up.
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11-02-2020, 05:49 PM #116
So on that particular piston, it does not look like the coating extends right to the bottom of the skirt either. Would this have a negative affect? I would think that would still be a cylinder wall contact point, no?
www.InjectorService.com
Call/Text - 204-326-0390
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11-02-2020, 11:47 PM #117
Whos old enough to remember "skirt buttons" .. ???
No , not at the prom ... like these --->
Wiseco , JE , Carrillo , CP , Advanced sleeve .. are all under one big tent now .
Wiseco started that " patch coating".. Ain't that cute ..
The bridge structure is pretty awesome .. I think Diamond piston started that .
To Wiseco's defense , they state that their pistons are to be measured minimum .500 up from the bottom and 90* from the pin.
Which tells me that there is quite a bit of "barrel taper" on both the top and bottom of their skirts .. this shot somewhat shows that .
But more importantly , speaks volumes about what Uncle BBQ said about the "quality of the job" . I know that my used pistons , even the ones I tortured , still have permanent remnant's of coating that you can see from across the shop. This slug looks like the coating "wiped right off" leaving an unprepared surface below.
After thinking about that crossflow "flathead Ford" a bit, and seeing what a fine job they have done ( coated pistons as a whole in the massed produced versions)
If it were me , I'd act like it's "just another nekkid piston" . Prep it the right way , coat it , bake it , and run the *(&^%&**(*( out of it ...
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11-03-2020, 04:13 AM #118Scream And Fly VIP
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When did they run skirt buttons Chaz? And for how long?
If I get the chance today, I am gonna blast me a piston or four..........but voting comes first todayLast edited by keefallan; 11-03-2020 at 04:18 AM.
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11-04-2020, 09:09 AM #119
Flash in the pan .. circa early 1970's . Mostly fuel cars and Harley's .
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11-04-2020, 09:34 AM #120Member
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