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Author Topic: Painting Exhaust & Insulation.  (Read 4667 times)
DavidInWilmNC
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« on: August 29, 2007, 10:43:37 AM »

I'm finishing up the cooling hose replacement (all of 'em) on my 8V-71.  I'm trying to keep track of all the hose sizes and locations for those who need to replace hoses or just want to purchase some as spares.  I removed the exhaust crossover pipe for easier access to some of the hoses and thermostats.  In doing all this, I've been cleaning and painting the engine.  So far, it's about the best looking 8V-71 I've seen lately!   Wink  I'll have to post pics of it when I'm finished.  It should be a lot easier to find leaks on a painted surface rather than a grease encrusted covering.  The crossover pipe and Y-pipe that lead to the muffler are naturally rusty.  Is there a paint that will hold up to the heat from the exhaust?  Is there any reason NOT to paint the exhaust, assuming I use the correct paint?  I'll  do the same for the generator exhaust pipes.  I'm thinking a little rust protection can't hurt and it would look a bit better. 

I'm also considering some of the exhaust insulation, but have read/heard that it can cause the pipes to not hold up as long.  Is there any truth to this?  It seems it would keep the engine bay a bit cooler and blow more heat out the tailpipe.  Again, I'd like to do this to the generator's pipes, as they get quite hot.  Thanks for any experiences or input.

David
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maria-n-skip
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« Reply #1 on: August 29, 2007, 10:59:43 AM »

Dave,

     I have seen some picture of chrome cross overs... probably not the practical side your thinking about.
 You might consider stainless steel pipe if you are going to wrap the exhaust.

  Expensive, local muffler shop should be able to make the bends and you can weld together;
  should last you a long time......

   Just a thought
 Skip
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Dallas
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« Reply #2 on: August 29, 2007, 12:51:23 PM »

David,

When are you gonna have the rocker covers chromed and the blower powder coated?

Oh, and there's always the airbox covers, you could chrome them too!

How about getting some of the braided colored hose covering that JC Whitney sells?

While your at it, you could have the exhaust heavy chromed and maybe have the alternator polished.

THEN, you could be like the hot rod kids and take the engine cover off!

Next you could add Raised White Letter Tires or even the Wide white sidewalls!

HHey! I can spend your money faster than you can make it!

Spinners, Chrome, Coon tails, Big antennas, Chicken lights, Chicken sticks, Wire wheels! The list is almost unending!

Cheesy Grin Wink Smiley Wink Cheesy Grin

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oldmansax
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« Reply #3 on: August 29, 2007, 01:58:28 PM »



Spinners, Chrome, Coon tails, Big antennas, Chicken lights, Chicken sticks, Wire wheels! The list is almost unending!

Cheesy Grin Wink Smiley Wink Cheesy Grin



Dallas, your inner "truck driver" is showing!!
 Grin Grin Grin Grin Grin Grin Grin Grin Grin Grin Grin
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Dallas
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« Reply #4 on: August 29, 2007, 03:58:46 PM »



Spinners, Chrome, Coon tails, Big antennas, Chicken lights, Chicken sticks, Wire wheels! The list is almost unending!

Cheesy Grin Wink Smiley Wink Cheesy Grin




Dallas, your inner "truck driver" is showing!!
 Grin Grin Grin Grin Grin Grin Grin Grin Grin Grin Grin


Tom, At least I didn't mention anything about a chrome sunvisor or a MACK dog with winky eyes on the nose of the bus!  Wink

http://www.75chromeshop.com/product.php?productid=4991&cat=1114&page=3

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Hi yo silver
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« Reply #5 on: August 29, 2007, 06:48:12 PM »

Don't let that bunch of old fogeys making fun of you get to you, Dave.  They're just jealous 'cause their ole ladies won't let them have all that chrome they want for their buses.  Go for it!
Dennis
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Tom Y
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« Reply #6 on: August 29, 2007, 07:03:48 PM »

Dave, I wrapped my turbo and exhaust and my gen exhaust. Of course I have not driven anywhere but have run both. I bought from a place in Texas, they made to fit for me. If you wish I will look up the #. Their price seemed fair also.  Tom Y
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DavidInWilmNC
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« Reply #7 on: August 29, 2007, 08:36:33 PM »

Tom, that contact info would be great.  For the rest of you guys, who said anything about chrome?  Hell, I've still got those tacky old steel wheels ... maybe I can get some of those 22.5" spinner wheel covers!   Wink  If ya'll are gonna be like that, I won't show you my engine when it's all pretty!  J/K.  Actually, while I had certain things apart, it just made sense to spray paint what I could.  I mean, the engine runs so well (31,000 miles on rebuild) that it deserves to look somewhat presentable.  People are always asking to see the engine anyway and it just looked so nasty!

David
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Dallas
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« Reply #8 on: August 30, 2007, 04:36:03 AM »

Ahhh, David! Not letting us see is just pure meanness!

Aside from the fact you were suppose to stop at SOB so we could see the bus, but would you? N0000OOOOOOooo! Just some lame excuse about running a poor defenseless tree down in it's prime!

You be nice or one of these days I'm gonna sneak up and slap a "Cummins Rules" bumper sticker on your hind end!  Grin

Seriously, I and a bunch of others would like to see the results of you engine beautification project!

Dallas

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Stan
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« Reply #9 on: August 30, 2007, 05:28:19 AM »

Back to the question. Ordinary aluminum paint in a spray can is easy to apply and lasts for a few years before you have to redo it. Just hold a big piece of cardboard between the pipe and engine and spray away.
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DavidInWilmNC
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« Reply #10 on: August 30, 2007, 05:48:02 AM »

Ahhh, David! Not letting us see is just pure meanness!

Aside from the fact you were suppose to stop at SOB so we could see the bus, but would you? N0000OOOOOOooo! Just some lame excuse about running a poor defenseless tree down in it's prime!

You be nice or one of these days I'm gonna sneak up and slap a "Cummins Rules" bumper sticker on your hind end!  Grin

Seriously, I and a bunch of others would like to see the results of you engine beautification project!

Dallas

You know, I've got to fix that place where I ran over that root.  That'll be on the fall / winter list, I'm sure.  I looked at that root as we left.  It came out a whole lot better than the bus did, that's for sure!

I will definitely post some pics as soon as it's finished, 'cause it won't be long 'til it's all greasy again!  LOL at 'Cummins Rules' sticker... We were joking last night about 22.5" bus spinners and how they could be handy when it comes to those tree roots.  They'd have to be steel spinners - stainless for MCI's and mild steel for Eagles - and pretty sharp, but they'd help get those pesky trees and roots right out of the way.  Curb feelers might be handy, too.  Seriously, right after I got the bus two years ago, several friends threatened to call 'Pimp My Ride' and see if they can help move the conversion along!

Stan, I'm not familiar with aluminum paint.  Is this kind of like the zinc paint (aka 'cold galvanizing) paint) but with aluminum instead?  I'm not familiar with that.  Do you know of a brand?  Thanks!

David

« Last Edit: August 30, 2007, 06:33:36 AM by DrivingMissLazy » Logged
Stan
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« Reply #11 on: August 30, 2007, 08:15:12 AM »

David: I think all the brand name paint companies have it in bombs or brush-on. It is make with very fine aluminum powder and the brush-on stuff is very thin and you have to stir it constantly or the metal goes to the bottom. I just checked in my garage and what is on the shelf is a local hardware chain name so it is no help to you.
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Darrell
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« Reply #12 on: August 30, 2007, 11:49:29 AM »

David, an old rodder's trick I use all the time in detailing an engine while still in the vehicle is to use aluminum foil and wrap it around the things I don't want paint on.  It works great!
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dvrasor
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« Reply #13 on: August 30, 2007, 03:04:58 PM »

since the pipe is already off get it sandblasted then go buy
yourself some VHT brand paint and follow the instructions.
  Make sure the pipe is in good enough shape to warrant
the time and effort.

        dvrasor 4104 2375
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Tom Y
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« Reply #14 on: August 30, 2007, 07:02:26 PM »

David, I bought mine from Coverflex Man. at 1-866-268-3735  I spent 140.00 to do my turbo and down pipe, faxed a drawing to Norberto Garza. When I did the gen the price seemed a little high, talked to him and he saved me some money on it. It is thick and is wrapped with a stainless mesh, which I laced up with stainless wire. I can try for a pic if you wish.  Tom Y
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« Reply #15 on: August 30, 2007, 09:00:58 PM »

I used the thick wet blanket insulation from EHP. It just about stops all heat if coverage is complete. The wet wrap is then covered with Al foil tape to keep the insulation clean and for better looks.

My guess is that it will make the exhaust system last longer because all the heat gets blasted out the exhaust instead of radiating into the engine compartment.

My experience with a bunch of different kinds of exhaust pipe paints is that none of them work for very long. I gave up on them long ago. Al paint will last one engine run on the exhaust pipe and probably less on the exh manifold.
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Cary and Don
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« Reply #16 on: August 30, 2007, 11:34:55 PM »

That wet wrap insulation is the best $300 we ever spent.  The differance in the compartment temperature is amazing.  The foil wrap keeps it all nice and clean.  Almost looks like chrome.

Cary
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« Reply #17 on: August 31, 2007, 12:32:38 PM »

Cary,

The first time I ordered it I was very reluctant to spend that much money and was not completely convinced it would work.

Was I amazed, I reallly couldn't believe the difference. I used it on my first generator and then again on the exhaust on my second one plus the dry type to line the inside of the gen box. It is the only thing I will use from now on.

I haven't used it on my 671 because we stay in a bunch of cooler places and the extra bedroom heat is kind of nice. The 671 probably doesn't get nearly as hot as the larger engines.
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« Reply #18 on: August 31, 2007, 02:59:56 PM »

Guys,

I read recently, I don't remember where, that "you can wrap stainless but you can't wrap the standard exhaust piping cause the regular will deteriorate but the wrapping has no ill effect on the stainless".  Now that is exactly the opposite of what I have read on other posts.  Those guys made a point of not going stainless so that they COULD wrap their pipes.

HELP!

John
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JackConrad
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« Reply #19 on: September 01, 2007, 05:47:48 AM »

My concern would be any wrap may trap moisture fron condensation as the exhaust cools, leading to premature failure due to rust?  Jack
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« Reply #20 on: September 01, 2007, 06:35:55 PM »

Jack,

If that were true the exh system would most likely rust from the inside out-in fact they used to do just that before exh pipe alloys were improved. I have  '86 and '88 minivans that have never had any exhaust system components replaced, both with almost 200k mi each.

Any moisture between the blanket and metal will quickly evaporate with engine use.

If that were a real concern one could simply drill a few drain holes. Mufflers used to have them, haven't really paid any attention lately to see if they still do but I doubt it.

This EHP wet blanket wrap solidifies once it dries so it is like a heat proof cast on the system. It won't unwrap but is a bit brittle if something hits it. The Al tape wrap is to protect it from damage as well as dirt or oil.
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« Reply #21 on: September 02, 2007, 05:41:28 AM »

Gus, thanks for the information.  I thinks it also depends on how much the vehicle is used.  Many years ago (late 60's), I worked as a mechanic for a Chrysler-Dogde-Plymouth dealer. It seemed like the cars that were driven daily needed fewer exhaust repairs than those that were only driven occasionally. I always thought it was the daily driving kept the system dried out out.  Jack
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« Reply #22 on: September 03, 2007, 08:37:13 AM »

and for cars, exhaust systems last many times longer since the switch to unleaded fuel. 
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Jim Stewart
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« Reply #23 on: September 03, 2007, 08:59:25 PM »

Jim,

Lived in Alpine and El Cajon and Poway and Binita.  Hi!

Combustion equals water generated.  In the winter our muffler fills with water till the thing gets hot enuf to evap it and blow it out the ex pipe.  Always see water running out the pipe in the cold winter.

The ex on my Cressida was stainless OEM.  My Lexus is also stainless.  I have even noticed stainless parts of domestic cars.  I think that has a lot to do with the ex sys on newer cars lasting longet.  Cressida went twenty years and I junked it with a flawless ex sys. 

The old gas had more sulpher in it and that leads to sulphuric acid but I am only guessing that that made a significant difference. Stainless I am sure of cause I can polish that stuff.

John
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« Reply #24 on: September 03, 2007, 09:13:08 PM »

Our 1995 ex-police car Crown Victoria has stainless exhaust, also. Good as new, as far as I can tell.

Tom Caffrey
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« Reply #25 on: September 04, 2007, 04:12:25 AM »

I guess this is as good a place to start as any! Grin  Has anyone tried JetHot coatings yet?  I managed to go to a car show this Labor Day Weekend, and I noticed that a lot of the car nuts are going to JetHot for their headers, they look great and don't rust and dissipate heat quickly!  I used JetHot on racecar headers a few years back, we had to wash the cars after every race, and the headers after a while looked pretty bad from repeated washings!  JetHot stopped that! I'm sure its not cheap, but if your dressing it up, why not give it a try! I was considering using it on some of my exhaust lines to the muffler! You can even get it in different colors!   

Pat
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« Reply #26 on: September 04, 2007, 10:54:42 AM »

If you dyno an engine before and after wrapping the ex and headers you will see a LOT more power after wrapping the system.  Only us nuts ever mention that the engine bay stays cooler.  Everybody else is doing this to get more ponies and MPG.

Want a pretty ex?  Do what M Benz does and sent the thing out to get porcelan coated.  50 years old and still has a shiny glass look. 

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”
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« Reply #27 on: September 05, 2007, 06:59:12 AM »

johnEd -how long ago did you move?  there does not seem to be all that many bus nuts in this area sorry to loose one.  HOw do you  like Eugene?  Say hi to Dick Wright, good guy
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Jim Stewart
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« Reply #28 on: September 05, 2007, 11:00:12 PM »

Jim,

I left in 90 when I retired.  I took care of my Dad for 6 years in both Pa. and Or.  Or. has superior services for the elderly and he enjoyed his last years very much.  I consider SD the finest place on earth and I would have stayed were it not for the fact that I couldn't afford to live there on a disability pension.  I am a long way from busted but the costs there vs here are dramatic.  My last house in Poway sold for $800K and I paid 24K for it new in 75.  Perspective.

I still don't have my bus but it will be purchased in 2008.  Leaning towards a 102C3 but a partially completed MCI 9 might turn my head.

Hope you are well and thanks for the input.

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”
—Pla
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