Exhaust paint Options

[Jett]

(IMG:style_emoticons/default/smile.gif) I used stoddard grey on my 1.7 muffler and ceramic coated the NOS heat exchanges and NOS muffler for our 73 2.0. Will post pics tonight.

[Matty900]

(IMG:style_emoticons/default/smile.gif) I used stoddard grey on my 1.7 muffler and ceramic coated the NOS heat exchanges and NOS muffler for our 73 2.0. Will post pics tonight.

I just dropped my heat exchangers and muffler off today for ceramic coating. I went with the black on the Heat Exchangers because it is supposed to reduce as much a 60% of the heat radiating from them in to the engine bay. The other colors insulated less but I don't remember how much less. I want to say it was like 45%.

[Tom_T]

I just dropped my heat exchangers and muffler off today for ceramic coating. I went with the black on the Heat Exchangers because it is supposed to reduce as much a 60% of the heat radiating from them in to the engine bay..

I'm not sure that it's a good idea to hold that heat in them Matty, especially being an air cooled engine.

Even for cold climates, once the heat radiates/transfers to the outer skin of the HEs, it's pretty much spent in transferring heat to the air chamber for cabin heating.

After all, Porsche chose their exhaust paint colors for a reason, & based on their vast racing experience.

So you may want to rethink your color choice & stick with something closer to stock.

JMHO! (IMG:style_emoticons/default/beerchug.gif)
Tom
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[moorepower]

I would use Tech Line Coatings Black Satin. Coat the outside of the heat exchangers and the outside of the muffler. It will reduce the amount of radiated heat from the exhaust system heating up the air surrounding the engine, allowing the cooling fins to to a better job. It also makes the heat exchangers more efficient for the purpose of heating the cabin. Before I sold the business, I coated headers, exhaust systems, and a multitude of various engine parts, ect for 19 years. The coating is very effective on heat exchangers, for colder climates.

[DennisV]

Has anyone sprayed the Wurth High Heat Aluminum Paint?

I am wondering if it is even close to exhaust gray, or rather a bright metallic finish as "aluminum" might suggest.

As of 2024, many of the paints mentioned in this and other threads are NLA.

For our 914-6, I'm planning to buy a pair of new 914 heat control flapper boxes. Cut a hole in the cap and paint them gray to be closer to 914-6 original.

Thanks.

[mepstein]

The oem 914-6 flapper boxes that I’ve seen were a medium to dark grey. I’m guessing they started out light to medium grey but some got darker from age/exposure. It’s a matt primer grey, not glossy or metallic. I’ve changed a couple 4’s to 6’s with a 7/8” metal hole saw and a drill press. Then I blast and powder coat black - I wasn’t going for originality on the color. I don’t think the flappers get particularly hot. It’s not like exhaust temperature heat is entering the cabin area.

[Ishley]

I’m a fan of cerekote. Withstands the heat and looks good. Everything I’ve used is the air dry version and it drys a matte finish. The trick with Cerekote is you need a really clean blasted metal surface. You spray it with a HVLP gun. A single cover coat is all you do. Thick coats will bubble and you have to start over.

[nivekdodge]

I just did Cerakote's
air dry on my exhaust and it seems to be working

Kevin

[rick 918-S]

I have some galvanizing spray paint I picked up at the local welding supply store. Radnor Brand. It is a nice gray color and holds up well.

[mb911]

Big fan of cerakote but I can tell you my favorite paint for exhaust that matches OEM is rustoleum 2000 degree primer.

[porschetub]

Using the same VHT product ,well pleased with it and no burn or corrosion on the hot spots, used this paint on a preheated clean muffler but IMO prep is key to getting it to last .
Cleaned all the old coating off and wire buffed till the whole thing was shiny then used emery tape to help key the paint on the surface,warm day but nuked it with my heatgun,did this on every coat ..looks great and lasting well cheers.

[barefoot]

I did my 911 parts with Jet cote some yrs ago looked very good: