Author Topic: Ceramic coating exhaust manifolds  (Read 83 times)

raueda1

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Ceramic coating exhaust manifolds
« on: 05 November 2019, 11:59 AM »
I'm considering getting exhaust manifolds ceramic coated. Then I learned that the coating will increase the emmisivity of the manifold vs uncoated cast iron.  Moreover, the color doesn't matter cause it's emitting infrared.  From a performance point of view if [coated]=[cooler exhaust] that's probably good.  However, the manifold is pretty close to various hoses and the engine compartment temperature is already high.  Anybody have any idea if the coated manifolds would materially raise it higher?  I'm probably overthinking things, as usual, but comments still welcome. 

And while we're at it, has anybody had custom, tuned headers made for a 6.9?  Anything to be gained?  Cheers,
-Dave
Now:  '76 6.9 Euro
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

daantjie

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Re: Ceramic coating exhaust manifolds
« Reply #1 on: 05 November 2019, 03:20 PM »
Dave, from memory there have been some posts on mods on the 6.9, notably this dude appears to have had some nice gains:

https://www.youtube.com/watch?v=BxN4AQNzFYE

However on the header front, I think success is limited due to extremely tight clearances, plus you are dealing with massive heat soak due to the engine bay being so tight.  Of course anything is possible with enough time and money, but I think it will still be marginal gain for the investment IMHO.

« Last Edit: 05 November 2019, 03:32 PM by daantjie »
Daniel
1977 450 SEL 6.9 - Astralsilber

rumb

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Re: Ceramic coating exhaust manifolds
« Reply #2 on: 05 November 2019, 04:52 PM »
I used https://www.eastwood.com/eastwood-hi-temp-internal-exhaust-coating-w-nozzle.html on my 250S. I sprayed inside and outside. Has a nice silver color. I have no idea if it helps yet. I have had a real problem with vapor lock on that car and used the coating to try and help that situation.
On my 6.9 I sandblasted the exhaust and sprayed with clear VHT high temp paint. It turns them a nice grey color.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

nathan

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Re: Ceramic coating exhaust manifolds
« Reply #3 on: 10 November 2019, 06:07 AM »
I had mine done on the 6.9 and the 280te im doing.
supposedly heat management is better, but im just tired of knowing they looked like crap.
I get them done a dark grey to look something like metal. I think originally they are light in colour but this would stain too easy (although the ceramic stuff supposedly cleans easier).
anyway, some pics on a thread from a couple of years ago
https://forum.w116.org/mechanicals/6-9-engine-rebuild-with-pics/75/

6.9 79 #6436
6.9 79 #6290
6.9 79 #6181
6.9 78 #4764
6.9 77 #3096
6.9 76 #1741
6.9 76 #0902
6.9 75 #0018

ptashek

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Re: Ceramic coating exhaust manifolds
« Reply #4 on: 10 November 2019, 12:30 PM »
I did mine in the 450SE. Can't say heat transfer changed in any way, as it's always, quite literally, hot as hell under the hood anyway ;)

They did look great for a few thousand miles, then went murky brown around the hotspots, and eventually the coating started cracking albeit it's not flaking off. That's about 15k miles after.
1993 "Pearl Blue" W124 280TE
1979 "Icon Gold" W116 450SE (history, resto)