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  #1  
Old 11-29-2004, 12:07 PM
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Suggestions Requested- Coating for Exhaust?

So I am going to replace the three main segments of the exhaust system on the 280E. I'm too cheap to do stainless, so raw white metal is what I'm getting. I would like to put a couple of coats of something on the pieces to delay the inevitable. These pieces rust way too quickly to suit me.

I've looked at some spray-on resin stuff for exhaust manifolds that needs to be baked-on at 650 degrees for an hour-or-so or run on the car within 8 hours of "painting" it on. Chances are that it will take me more than 8 hours to wrestle off the old system before being ready for the new one.

Anyone have good experience with a particular heat-resistant paint? Or, should I just shop for some Barbeque paint at Home Depot?

Thanks, Alex

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Old 11-29-2004, 01:05 PM
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Try looking into the Jet Hot coatings.

They have a website: jet-hot.com.

This is a popular coating for hot rods.

Another option would be Eastwood's header coating paint. It is a thick grey high-temp paint and when cured has the look of natural cast-iron. I've used it on all my show cars with the original cast-iron exhaust manifolds. My old 230/8 was done 15 years ago and the exhaust manifold still looks new.

230/8
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  #3  
Old 11-29-2004, 05:03 PM
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For quick and easy exhaust coating, just try any brand of silver spray paint on the parts before you install them. Be sure to fully paint all the welds and seams. The Aluminum in the paint will resist rust and heat for quite awhile (but not 15 years).

Happy Motoring, Mark
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Old 11-29-2004, 05:10 PM
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gimme a low-tech 240D
 
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Is that 'raw white metal' heavy guage Aluminum?
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  #5  
Old 11-29-2004, 07:23 PM
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Generally, except for external heat sheilding, exhaust systems are made from some type of steel because, under some extreme conditions, aluminum would melt. The steel may be galvanised, aluminised (aluminum coated) silver painted, lacquer coated (quickly burns off the new exhaust and it starts rusting immediately) or, in the case of many newer cars, some cheaper grade of stainless.

Happy Motoring Mark
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Old 11-29-2004, 09:38 PM
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gimme a low-tech 240D
 
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Some of these muffler cobblers are superb craftsmen. As a rule they hate piece-meal repair of existing systems but will cut a nice deal if they get to build the entire thing. I just had the single pipe system with resonator and muff replaced with custom built system for $195. The muffler guy said heavy guage aluminum pipe was all he ever used. Could have been an alloy blend though, I dunno.
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Old 11-29-2004, 10:18 PM
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Well, I've been in the auto repair field for 27 years and have never seen aluminum automotive exhaust pipe, either OE or aftermarket, gas or diesel. I never dealt with a custom fabricator though. Could be your diesel exhaust runs cooler than what comes out of the catalyst on a gas car or you could have aluminised steel pipe. Check that new system and see if a magnet sticks to it.

Happy Motoring, Mark
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Old 11-30-2004, 10:06 AM
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gimme a low-tech 240D
 
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Magnet sticks to the cannister but not the pipe.
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Old 11-30-2004, 10:19 AM
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Verrrrrry interesting. What car did this aluminum pipe go on? Let us know how it holds up.

Happy Motoring, Mark
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Old 12-15-2004, 01:36 AM
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I worked mufflers from 1985 to 1995 and have never seen aluminum pipe. I saw lots of "Aluminized" pipe that became popular in the 1980's. It had a tendency to split easier than cold rolled, but was generally easier to work.

It also required a different "feel" to weld. It was becomming popular about the same time shops were converting to mig welders.
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Old 12-15-2004, 11:27 AM
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gimme a low-tech 240D
 
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Here's my muffler mechanic at Radcliff KY if y'all wanna give him a call: 270-351-4344 This guy is an extreme cobbler and we've got a racetrack nearby, so he makes up his own rules on muffler design.

Heavy guage aluminum pipe goes for $2.50 per foot. His chief concern was a secure weld to the forward steel pipe on my rattling and knocking 240D. Normal mechanics think the engine is a wreck when they hear it. So far the muffler welds are holding up fine. I dont know what kind of welding process was used.

Diesels blow unburnt fuel until they reach operating temp that slimes and coats inside of muffler pipes. As a rule, diesel muffs last alot longer than do other mufflers. The fuel and it's combustion process acts as a lubricant that also adds longevity to valves, injectors and combustion chambers. Gasoline burns dryer and is more of a corrosive solvent than a lubricant.. Plus the 240D develops no vacuum, so exactly how it breathes has more to do with fuel combustion than anything else. It's a very strange little engine.
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  #12  
Old 12-15-2004, 11:51 AM
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Jet Hot coating

I internally & externally JET HOT coated my exhaust headers 8 years ago. To date the external appearance still looks like polished stainless. It is expensive though.

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