piston coatings

[ForceFed Wraith]

Quote:

Originally Posted by turbovanman I am also considering getting my pistons coated. I have read that the coating on the crown does reflect to much heat into the chamber and causes more detonation. I will not be coating my cylinder head. Anyone have any info, or actually coated pistons-did it make it more detonation happy??????

Yes, coating will obviously make a motor more detonation prone. I recently tore down my 5000 mile engine with a ceramic coating on top, teflon on the side and "thermal undercoat" on the bottom from www.performancecoatings.com

Good place, and good service and fast. However, upon tear down, the teflon was worn down on the thrust sides of the piston ... probably mixed in with the oil. Even with the low friction coating, my honing marks were completely erased and had lot of blow by (still dont know why).

And even with the ceramic coating on top, I had so much carbon build up on the piston, I dont know if the coating made any difference.

IMO, I would leave it out.

[Stratman]

Quote:

Originally Posted by ForceFed Wraith Yes, coating will obviously make a motor more detonation prone. I recently tore down my 5000 mile engine with a ceramic coating on top, teflon on the side and "thermal undercoat" on the bottom from www.performancecoatings.com Good place, and good service and fast. However, upon tear down, the teflon was worn down on the thrust sides of the piston ... probably mixed in with the oil. Even with the low friction coating, my honing marks were completely erased and had lot of blow by (still dont know why). And even with the ceramic coating on top, I had so much carbon build up on the piston, I dont know if the coating made any difference. IMO, I would leave it out.

I would have to agree now, since the motor has been running for about 4000miles, I have continuously checked/changed the plugs and stuck my little tiny flex light into the cylinder to look how the pistons are doing. Cylinder# 3 has some of the coating flaked of in spots, 4 doesn't look too bad, and 1 and 2 look like they are brand new still. Have run +104 in the tank to check for eveness of the injectors flow on each cylinder by the redness that is left on the plug. 3 seems to be the leanest which would explain why the coating looks the way it does. Well, that and my cranking the advance too high in the lower boost range (running 93 octane) trying to get it to spool didn't help matters. hwell:

I had the skirts coated too. Polydyn uses some nylon based chemical and I was also told that the dry film lubricant that was put on the skirts would eventually rub back down to show the metal anyways. All hatch marks from honing are still there and a leakdown test shows no more than 3% in cyl 1, 0% in 2, 1% in 3, and 1% in 4, blowby is pretty minimal but make sure your crankcase filter isn't clogged or you'll see oil seep from places.

[turbovanman]

Quote:

Originally Posted by ForceFed Wraith Yes, coating will obviously make a motor more detonation prone. I recently tore down my 5000 mile engine with a ceramic coating on top, teflon on the side and "thermal undercoat" on the bottom from www.performancecoatings.com Good place, and good service and fast. However, upon tear down, the teflon was worn down on the thrust sides of the piston ... probably mixed in with the oil. Even with the low friction coating, my honing marks were completely erased and had lot of blow by (still dont know why). And even with the ceramic coating on top, I had so much carbon build up on the piston, I dont know if the coating made any difference. IMO, I would leave it out.

Hmmmmmmmm, could have been a bad job on the coatings. How about detonation issues???

Also, have read about the skirt coatings, OEM use them now but they say even though there worn off, its in the piston metal so it still works!

[Turbofreak]

Quote:

Originally Posted by turbovanman Hmmmmmmmm, could have been a bad job on the coatings. How about detonation issues??? Also, have read about the skirt coatings, OEM use them now but they say even though there worn off, its in the piston metal so it still works!

That's what I was thinking also....

Maybe the pistons weren't cleaned well or had oil on them before coating, or there is a detonation problem in one hole....

Also, to wear a skirt coating away, I am of the thought that you are washing the walls down with fuel... but that is just a guess....

that, or you have your pistons set up way too tight on the skirts... what clearances are you running???

RYNO
OMNILET

P.S.- I just had my venolias coated by Polydyn.... they look just like yours... but hopefully, mine won't be flaking off... I also polished all the rough edges off before sending them to be coated, and I had 6 pistons coated "just in case"

[turbovanman]

Oh crap, I just realized who did your coatings, lol!
I road race motorbikes with the owner! thats who I am going to get mine done with. Have you per chance talked to him about the flaking?

Carbon build up indicates poor running-ie too rich or burning oil. That would be why your cross hatch is gone and lots of blowby if you were too rich! I had 20,000 km's on my engine and had to replace the pistons and they were clean!!!!

[Stratman]

Quote:

Originally Posted by turbovanman Oh crap, I just realized who did your coatings, lol! I road race motorbikes with the owner! thats who I am going to get mine done with. Have you per chance talked to him about the flaking?

Yea, Carl. He's a cool guy to talk too. I talked with him a couple days back and he couldn't believe we run the high EGT's we do. He said 1500-1550 was why high for pump gas.
On the cylinder part, I screwed with the timing alot at the track and pulled it kinda high trying to find spool, and that one cylinder is the leanest so detonation would probably be a factor.

Quote:

Originally Posted by turbovanman Carbon build up indicates poor running-ie too rich or burning oil. That would be why your cross hatch is gone and lots of blowby if you were too rich! I had 20,000 km's on my engine and had to replace the pistons and they were clean!!!!

That is Forcefed Wraith having that issue.

[turbovanman]

Quote:

Originally Posted by Stratman Yea, Carl. He's a cool guy to talk too. I talked with him a couple days back and he couldn't believe we run the high EGT's we do. He said 1500-1550 was why high for pump gas. On the cylinder part, I screwed with the timing alot at the track and pulled it kinda high trying to find spool, and that one cylinder is the leanest so detonation would probably be a factor. That is Forcefed Wraith having that issue.

I know, just reread post and saw he had said that, better late answer then never

Carl, thats not the owner! for some reason, can't remember his name! doh!

[Stratman]

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Originally Posted by turbovanman I know, just reread post and saw he had said that, better late answer then never Carl, thats not the owner! for some reason, can't remember his name! doh!

Is there a Polydyn in Canada?? If so, that explains the different owner. This one is in Houston, TX.

[turbovanman]

Quote:

Originally Posted by Stratman Is there a Polydyn in Canada?? If so, that explains the different owner. This one is in Houston, TX.

No, I was talking about Performance Coatings that Forced Fed Wraith used, lol!

[Stratman]

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Originally Posted by turbovanman No, I was talking about Performance Coatings that Forced Fed Wraith used, lol!

We are both getting off the path on who is posting what. Long day!

[turbovanman]

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Originally Posted by Stratman We are both getting off the path on who is posting what. Long day!

No kidding!

Remembered last night who owns Per coatings, its Brad, phew!

[mopar2ya]

Andre Parker and I do coatings and if you need can quote you for whatever you need done. I coated my entire engine thats waiting transplant, and coated the exhaust manifold, turbine housing & downpipe on the R/T. It dropped exterior temps around 200 degrees according to my infered gun.

[ForceFed Wraith]

Quote:

Originally Posted by mopar2ya Andre Parker and I do coatings and if you need can quote you for whatever you need done. I coated my entire engine thats waiting transplant, and coated the exhaust manifold, turbine housing & downpipe on the R/T. It dropped exterior temps around 200 degrees according to my infered gun.

I would definitely coat my turbine housing and exhaust mani. if I had the money. Keeps the rust out and the heat in.

[Stratman]

Quote:

Originally Posted by ForceFed Wraith I would definitely coat my turbine housing and exhaust mani. if I had the money. Keeps the rust out and the heat in.

Yes, I really like everything else coated except the piston tops.

[mopar2ya]

Would you like a quote on this stuff?