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Registered
Join Date: Oct 2002
Location: San Jose
Posts: 73
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ceramic coating/heat exchangers
Hey guys.
I would like to know if anyone had there heat exchangers coated with ceramic coating,it is more superior to powder coating,it reduces heat radiation,so the engine stays cooler.But the price is $250.00 for 2,I had bought a pair of used early style (73)heat exchangers for $250.00,Once there coated they will look like new.I tried to remove rust with naval jelly and rust fix and painted one,it looked alright from a distance,I know you cant see them,But its the principal,So I would like to know if anyone had ceramic coating.To ceramic coat or not to ceramic coat,That is the question,Any info appreciated,Thanks.  P.S .It coats the inside too,so you wont get a buildup of soot,It is a slick surface,in chrome and black,The black color reduces heat more than the chrome.
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Robert Parra |
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09-19-2003, 01:06 PM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Excellent idea. Coating inside and outside preserves the base metal. Surface prep is important. I would hot tank to remove oil residue, then sand blast to remove paint, rust and leftover scum. Bag in plastic, pack carefully and send to the coater. Will your coater prep the pieces? Whose coating process are you using?
Sherwood Lee http://members.rennlist.org/911pcars |
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09-19-2003, 01:23 PM
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Czar of C.R.A.P.
Join Date: Jul 2003
Posts: 2,323
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You know that just gave me an idea. When I worked in a boiler room we used this paint that had ceramic beads in it to insulate tanks. A steel tank with 210 degree water in it would be cool enough after to hold your hand on it. Could take a metal strip and paint one end and heat the other end with a torch while holding the strip. May work to keep heat off the valve covers. The stuff really is amazing, but expensive. The stuff goes on rather thick would maybe even absorb some of the heat exchanger rattles. Will have to give this more thought.
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66 912 Coupe 84 Carrera Cab Hardtop HC3.4 Hyper Carrera 2005 Dodge Magnum 5.7 HEMI Cabriolet Racing And Performance C.R.A.P. Gruppe #1 Put on some C.R.A.P. and drive.... |
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09-19-2003, 01:51 PM
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Join Date: Jan 2000
Location: Cumming, GA 30041
Posts: 883
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I had the headers on my Ferrari 308 ceramic coated a shiny silver by Airborne coatings. They came back looking fantastic and they also no longer radiate all that heat into the engine bay. Airobrne did all the prep work for me. I sent off nasty looking parts.... I got back shiny like new.
 The ceramic does an incredible job insulating the headers and thus not letting heat radiate out. Not a big deal on a 911 with the exhaust under the car in the air stream.... but a huge deal on a 308 where the fuel crossover pipe between the 2 tanks runs only 3 inches from the exhaust headers! The ceramic coating will also, as mentioned, do an excellent job protecting the metal and extending the life of your parts. A very good investment. Regular powder coating on exhaust parts is a waste. It wont last... Go ceramic. The cost is about the same. I had 2 headers done in ceramic, plus powder coated 2 cam covers and 2 cam belt covers and a radiator header tank, all for about $500. Terry
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Terry |
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09-19-2003, 02:18 PM
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Join Date: Oct 2002
Location: Minneapolis, MN
Posts: 1,226
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There was a thread a short time ago that cautioned against sand blasting the heat exchangers (HE). Reason is that you will not be able to remove all of the sand. When you install the HE the residual sand will find it's way into your cylinders. Seems to be logical. Anyone else experienced this? I'm looking to dress up my HE so would like to know.
Maybe a soda blast would work.
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Thanks, Mike When I was a kid, I didn't want a stupid pony, I wanted a PORSCHE. 1970 911T Coupe, 1979 911SC Targa Euro, 1971 Honda CT70 HK Trail 70 (the ultimate in two wheeled transportation) |
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09-19-2003, 02:37 PM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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I powder coated my heat exchangers many years ago (before ceramic coatings took off) and the paint is still fine. No flaking, but I guess it depends on who does it and what type? If I had to do it over again, I'd ceramic coat them.
"and thus not letting heat radiate out. Not a big deal on a 911 with the exhaust under the car in the air stream..." Not so. The air stream under the car stops when the car stops or at low speed. At this point, heat radiates from the heat exchangers into the valve cover area. I've checked the temp. with an IR temp. gun and temperature-sensitive strips to the tune of up to ~300ºF. Not helping is the catalytic converter (mid-70's on) which isn't shielded and radiates directly toward the engine. Directly behind the covers are the valve guides, valve seals, rocker arms and lube oil. That is why I developed these, a variation on the factory racing part.  It's not an oil cooler, but it helps a little. Sherwood Lee http://members.rennlist.org/911pcars also www.seinesystems.com |
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09-19-2003, 02:40 PM
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