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914World.com _ 914World Garage _ Another powder coat question

Posted by: Doug Leggins Sep 10 2004, 01:12 PM

Has anyone powder coated the heat duct "S" and "J" tubes? How hot do they get?

The folks at indy powder coating said that the powder coating is good up to about 325 degrees. I am thinking that the parts do not get that hot but really do not know. If the temp gets higher than 325 then the parts should be ceramic coated.

Any experience with coating these parts? Will the powder coating hold up to the heat that these parts experience?

I have SS elbows that attach to the heat exchangers so I'm not going to coat the elbows.

Posted by: seanery Sep 10 2004, 01:15 PM

Doug you could get them hi-temp coated ie..JetHot

powdercoating is heated to 400 degrees in the melting/curing(?) process, so get close to that temp and it may start to fail/melt/get runny.

-sean

Posted by: maf914 Sep 10 2004, 01:46 PM

Many years ago I converted my 76 exhaust to the 74 style with SS heat exchangers. I cleaned and sanded the "S" and "J" tubes and other associated sheet metal pieces and sprayed them with Krylon satin black (cheap 914 owner! ). Except for inevitable scratches they are fine today.

I say this because if rattle can paint can withstand the heat, I would think powder coating could as well. Or is Krylon satin black better than we think?

BTW, people have posted concerning their powder coated engine tin, and several have shown the pieces, including the air guides that bolt up next to the exhaust pipes. I don't know how well these last, but I heven't seen anyone post not to do this.

BTW, this leads to another question. Because powder coatings cure at 400 degrees, does this mean the coating will melt at that temperature? Obviously its not like water that will freeze or melt at 32 degrees. But what sort of reaction occurs at 400 degrees and is it reversible? Just wondering.

Posted by: Mueller Sep 10 2004, 01:46 PM

Eastwood has some powder coating that supposedly is good for 1000°f

http://www.eastwoodco.com/jump.jsp?itemID=986&itemType=CATEGORY&iMainCat=706&iSubCat=986

Posted by: Engman Sep 10 2004, 02:43 PM

You can powder coat these and they will be ok. Be warned though - you will have a bitch of a time getting them back together. These pieces are a tight fit as it is and powdercaoting will add .004"and up. I have seen parts get as much as .010".
I speak from experiece. Contact me offline and maybe I can help you with some ecaoting. Thats what I did to mine and they have been fine. Ecoating adds .0008" to the part and is very consistant.

M