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Thread: Prolong life of new exhaust?

  1. #1
    formerly blkpnthr
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    Default Prolong life of new exhaust?

    As I've alluded to previously, I'm accumulating all the parts required to replace the exhaust on my Town Car and in doing so, convert to dual exhaust. I've got the H, the tails, the cats (yes, cats), and hoping to re-use the mufflers off my '97 Vic parts car which are some sort of rumbly aftermarket examples. Just waiting on some band clamps then need to examine the hanger situation. I'm doing everything I can to avoid any welded parts.

    The body of the cats is stainless, but I'm not sure the pipe is. I take it something like VHT Flameproof (prime, paint, clear) would be appropriate for the pipes because of how hot that area gets.

    What I'm not clear on is if the H, mufflers, and tails will get hot enough to cure the VHT product. What would the recommended product/process be to protect those parts on a winter-driven vehicle?

    H and tails are aluminized steel. My experience with Walker stuff in the past is that 5 years is the lifespan if unpainted. I'm hoping to go a lot longer than that...

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  2. #2
    Full of Greenhouse Gas Tiggie's Avatar
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    VHT website says 650F to cure on the last step. I don't think the tails get that hot. But I bet your H Will under extended load. Call the company and ask about rust protection if you don't get that last curing step. And try some on your current setup just to see what happens.
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  3. #3

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    I have religiously painted all steel exhaust pipes with VHT high temp paint on principle for over 20 years.
    The results are that you get another 1 or 2 years beyond not painting the pipes.
    But what the hell it only costs another 5 or 6 bucks to get another 1 or 2 years.
    It is slightly cost effective.
    The real solution if you know the car is going to be yours forever is to "bite the bullet" and go mandrel bent stainless.

  4. #4
    I'm an air-conditioned gypsy gadget73's Avatar
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    question is whether its rusting from the inside out or outside in. Inside out you can't do much about. Maybe a small drain hole at the bend behind the muffler to drain moisture out will help a bit, but beyond that making sure the engine is run long enough to get the pipes fully hot is about all you can really do for it.

    86 Lincoln Town Car (Galactica).
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  5. #5
    formerly blkpnthr
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    1 or 2 years...not even really worth the cost of the materials...

    That whole rusting from the inside issue did occur to me and I'm pretty sure it's why the Y-pipe failed at a cat flange on my '91. I'm tempted to use VHT on the inside of the pipes as far as the spray can reach, to hopefully deter that from happening. Viable?

    Stainless would be nice but when you have 5 vehicles that all need exhaust it just doesn't make sense.

    Unfortunately my commute is quite short so I think I may just be screwed on the exhaust rust topic.

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  6. #6
    GMN Regular DerekTheGreat's Avatar
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    Nah, unless you can clean the insides of the pipes the paint wont stick. It will just trap the moisture and accelerate the process, imagine a rocker panel... I think rotting from the inside out is the concern, with the one of the cat's byproducts being water its almost inevitable...
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  7. #7
    The Brown Blob 87gtVIC's Avatar
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    Quote Originally Posted by kishy View Post
    1 or 2 years...not even really worth the cost of the materials...

    That whole rusting from the inside issue did occur to me and I'm pretty sure it's why the Y-pipe failed at a cat flange on my '91. I'm tempted to use VHT on the inside of the pipes as far as the spray can reach, to hopefully deter that from happening. Viable?

    Stainless would be nice but when you have 5 vehicles that all need exhaust it just doesn't make sense.

    Unfortunately my commute is quite short so I think I may just be screwed on the exhaust rust topic.
    I think eastwood makes a product that may interest you.

    http://www.eastwood.com/eastwood-hi-...-w-nozzle.html
    ~David~

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    But, that's just coming from me, this site's biggest pessimist. Best of luck

  8. #8
    formerly blkpnthr
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    Quote Originally Posted by 87gtVIC View Post
    I think eastwood makes a product that may interest you.

    http://www.eastwood.com/eastwood-hi-...-w-nozzle.html
    Now there's an idea...

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  9. #9
    I'm an air-conditioned gypsy gadget73's Avatar
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    They have a product for coating the inside of frame rails that works on a similar concept. Kind of genius honestly.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
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  10. #10
    GMN Regular DerekTheGreat's Avatar
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    Cleaning. Cleaning, clean. If you can't get the surface to be painted clean & water break free, it's a waste of time. Think blister-ready-to-pop waste of time. I work in the corrosion industry, I'm schooled in the art of making things not rust. Why I'm a fan of oil/wax, shit that repels water. Coatings have a finite life system anyway, none seem to be impervious to water exposure.
    1985 LTD Crown Victoria - SOLD
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  11. #11
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    Maybe pcv fumes into exhaust pipe will help delay the rusting from inside....🤔 Oil fumes I mean..

  12. #12
    I post a lot... knucklehead0202's Avatar
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    Rebuild your engine and leave a ring off each piston. This should provide a healthy coating of oil throughout your exhaust system and prevent rust forever!

  13. #13
    formerly blkpnthr
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    Ah, yes, this project. Still not done lol. Chronic procrastination is an art, and I am an artist...

    83 GM 2dr | 84 TC POTM 1/2017 (Pre-Op) | 85 CS | 85 Ranger | 91 GM POTM 12/2017 | Junkyards

  14. #14
    GMN Regular DerekTheGreat's Avatar
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    Quote Originally Posted by knucklehead0202 View Post
    Rebuild your engine and leave a ring off each piston. This should provide a healthy coating of oil throughout your exhaust system and prevent rust forever!


    Quote Originally Posted by kishy View Post
    Ah, yes, this project. Still not done lol. Chronic procrastination is an art, and I am an artist...
    LoL I'd ask if you've met me but you have, just not seen how I do procrastination.. With all your updates you make me feel pretty bad haha.
    Last edited by DerekTheGreat; 10-12-2017 at 08:19 AM.
    1985 LTD Crown Victoria - SOLD
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