http://www.slantsix.org/forum/viewtopic ... it=Coating
I think this is the thread... but The pictures from 2008 are now gone
Greg
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| engine component coatings https://slantsix.org/forum/viewtopic.php?t=64548 |
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| Author: | DadTruck [ Wed Feb 26, 2020 9:07 am ] |
| Post subject: | engine component coatings |
one of the PRI Tech article series, this one speaks to coatings applied to engine components. I knew of coating piston skirts, somewhat to reduce friction, but mainly to provide a second layer of scuff protection. I had not heard of coating piston skirts to allow, for example, a standard size piston to be used in place of an OS piston. https://www.bluetoad.com/publication/?i ... &ver=html5 |
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| Author: | Dart270 [ Wed Feb 26, 2020 10:33 am ] |
| Post subject: | Re: engine component coatings |
Interesting. I am thinking I might try some main/rod bearing coatings sometime... Lou |
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| Author: | Greg Ondayko [ Wed Feb 26, 2020 12:31 pm ] |
| Post subject: | Re: engine component coatings |
Doc did some of this a while ago.. when I find the thread I will post. Greg |
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| Author: | Greg Ondayko [ Wed Feb 26, 2020 2:48 pm ] |
| Post subject: | Re: engine component coatings |
http://www.slantsix.org/forum/viewtopic ... it=Coating I think this is the thread... but The pictures from 2008 are now gone Greg |
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| Author: | slantzilla [ Wed Feb 26, 2020 4:32 pm ] |
| Post subject: | Re: engine component coatings |
The race shop I worked at swore by Microblue. It was for bearings and such. |
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| Author: | DadTruck [ Wed Feb 26, 2020 5:31 pm ] |
| Post subject: | Re: engine component coatings |
agreed, anti-friction coatings are not new, what the article that is linked in the first posting deals with, is using a coating to build out a piston skirt .020 + to allow one to use again a piston that was no longer useable due to an over bore on a crankcase. To explain it further: if you have a used set of slant six forged pistons but the block really needs an over bore to freshen it, instead of buying another set of forged pistons to match the new bore size, it is possible to have the skirts built up on the existing pistons to match the over bore put in the crankcase. Doc writes some good stuff but that is not what he was writing about in 2008. For me, the concept of building piston skirts out to match an overbore was new information. |
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| Author: | slantzilla [ Wed Feb 26, 2020 7:18 pm ] |
| Post subject: | Re: engine component coatings |
I see he really doesn't reccomend building pistons up more than a few thousandths. You can, but he doesn't like it. I'm guessing he does it on builds where new pistons might be unobtainable. 
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| Author: | DadTruck [ Wed Feb 26, 2020 7:34 pm ] |
| Post subject: | Re: engine component coatings |
Read the article posted at the link in the first post. They speak of building up piston skirts over .020 That is 10 times more than a few thou. There is a photo of a diesel piston with multiple dyno and strip runs with no visible issues at the coated skirt area. |
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| Author: | GregCon [ Wed Feb 26, 2020 7:45 pm ] |
| Post subject: | Re: engine component coatings |
PolyDyn is close to me and I've had lots of stuff coated by them. The thing is...their coatings are very thin...thinner than normal paint. I'd say paper thin, but paper is thicker. So if anyone is using a coating to make a piston thicker, it must be some sort of coating intended to be thick. In other words, normal Teflon and lube-carrying coatings are very thin. |
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| Author: | slantzilla [ Wed Feb 26, 2020 10:51 pm ] |
| Post subject: | Re: engine component coatings |
Quote: Read the article posted at the link in the first post.
I read it John. I didn't say he couldn't do it, I said he didn't recommend it.
They speak of building up piston skirts over .020 That is 10 times more than a few thou. There is a photo of a diesel piston with multiple dyno and strip runs with no visible issues at the coated skirt area. |
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| Author: | Greg Ondayko [ Thu Feb 27, 2020 5:20 am ] |
| Post subject: | Re: engine component coatings |
Okay.. Thanks different coatings for different purposes. I am in the market for coatings for long life bearings! Greg |
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| Author: | slantzilla [ Thu Feb 27, 2020 11:04 am ] |
| Post subject: | Re: engine component coatings |
I am intrigued by the coating of short skirt pistons so you can tighten clearances and stabilize the rocking. That could open up more piston choices. |
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| Author: | DadTruck [ Fri Feb 28, 2020 9:03 am ] |
| Post subject: | Re: engine component coatings |
and there you go,, maybe save some used scuffed pistons and find homes for slightly undersized new ones.... |
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