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Discussion Starter #1
quick questions,how do you engine guys feel about the polymer,antifriction,coatings applyed to performance piston skirts ? any one have any bad stories with them? or good stories, what sorces are out there ?will use them in a 500+procharged mag/mpi if i go with this, any ideas what 8 pistons would cost to apply this type coatings :)bulb
 

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Discussion Starter #3
coatings

thanks for response,looking to get a set of 8/blower pistons i already have but thanks for response,kevin
 

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quick questions,how do you engine guys feel about the polymer,antifriction,coatings applyed to performance piston skirts ? any one have any bad stories with them? or good stories, what sorces are out there ?will use them in a 500+procharged mag/mpi if i go with this, any ideas what 8 pistons would cost to apply this type coatings :)bulb
It's been a couple of years or so since I had a set done, but it cost about $20 per piston, including a heat barrier on the tops if I recall. I have not personally used Embee, but you may want to check into it with them. One of my customers is currently having his exhausts and other parts done there based on my referral, and I understand they do pistons as well.

Embee Performance Coatings
 

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Here is what I can tell you about coated pistons/ coatings. I coat the demo derby stuff (I know... let me hear it). These ass clowns don't think twice about spending 7 to 9k on a derby engine. I had a customer whos engine got so hot it burned the oil of course, the center cam bearings were so HOT it MELTED the babbit off them. No shit. The engine died because the babbit went into the main oil galley from the cam bearing to the main journal. Cloged the hole, and killed it.
Pistons, fine. Skirts, fine. Underside of pistons showed a little heat. They could have been reused.
Wags

Oh, moral to the story. It is a HUGE insurance policy. Probably will make some hp due to keeping some heat in th engine instead of the river. Or torque, or whatever. ROFL
 

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i was thinkin, i bet this stuff would work great on something else, especially for a red hydro, but i won't. no, i'll be nice... :D
 

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Ya...right:clapping:




:D
 

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Discussion Starter #8 (Edited)
thanks for info 1 more question

o.k. mabey few more
1 , lets assume the coating will start at lowest ring groove bottom (skirt only) to end of skirt?
2 , dome only so in other words no coatings applyed to area between [email protected] dome/skirt to below lowest ring groove am i correct or do the coatings cover the hole thing like a tasty chocolate cake
3 , what thickness would be profficent,in a blown,procharged,500+c.u.i.efi
4 , thanks guys for the info last time i built a hi perf boat engine computers havent been invented yet you have all given me so mutch valuable info have a great and safe season kev:)devil

just reviewd the eembee web site i had no idea how much i have to gain with other coating technoligys out there,thanks again
 

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question

after coating would the bore need to be a little bigger than what it would have been before the coating? it seems like the coating would add something to the piston.
Embee Jeff goes by Tiki on here contact him he knows all this stuff.
 

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Discussion Starter #10 (Edited)
yes a increse in finnish hone is needed

by:)bulb:)bulb what in finding out they recomend a machining on pistons, no can do ill just have my machine shop open her up a little more, check the coating web site also claims to run cooler for tighter finnish hone this looks promising to me
 

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1) Dome is coated. Well, whole top. It is a ceramic based or whatever. It keeps heat in the chamber and out of the oil for all practical purposes.
2) Skirt coating starts under the oil ring down. Above the oil ring piston dimesnsions are decreased. The job of that part of the piston is to support rings. Not provide a bearing surface for the pistons.
3) Machine pistons? Open up? (open up depends on application)

IMO don't adjust your clearance because of coating. You can adjust it because of application. If your coater is puting the shit on so thick they say to adjust.. find a different coater.

Wags
 

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You do not make adjustments for the side dry film coatong. It will buff away where it needs to. Even if you can no longer see the dry film coating, it is still doing the job it was applied to do. Unless the skirt is scoring, or smearing, its doing its job regardless if you can't see it. On bearings you may consider allowing for the coating and measure from the coated surface. The clearences for a crank bearing are a little more critical and some what smaller than a piston's
You COULD have to allow for the piston deck if your on the edge as far a quinch clearence. But if your that close, and you couldn't figure this out, you probably should be play it that close. Pistons that close to the head is a risky place for amatuer engine builders to play.

Of course, I have zero experience in this area because I never mess with the stuff. I mostly smoke and mirrors with a little voodoo mixed in. ;)



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