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Old 12-17-2008, 02:54 PM
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crack in exhaust manifold

I have ram horn exhaust manifolds and I noticed a crack on the lower part of the manifold near the collector. Is there a liquid cement or weld that I can use? They are hot jet coated and have have not noticed a leak.
Any advise would be appreciated.
Thanks.

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Old 12-17-2008, 04:11 PM
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Maybe some JB Weld. Needs to be clean metal before applying.
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Old 12-17-2008, 04:22 PM
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I tried JB weld on a head pipe and it burned off and smelled real bad in the process.

Might be able to fill the crack with a brazing rod? I bet that jet hot coat is going to make that more difficult..
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Old 12-17-2008, 04:22 PM
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Find the end of the crack and drill a 1/16" hole to stop the crack, then fill it with metal epoxy. Should hold for a while. You can also drill and tap the end of the crack and fill the hole with a small bolt. Don't torque it down or you'll just spread the crack. Maybe glue it in with some red hi-temp RTV or metal epoxy. That's not the "proper" way to fix it, but it will at least stop the crack from getting bigger.
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Old 12-17-2008, 05:34 PM
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There is nothing short of some expensive welding that will save the manifold...ditch it IMHO.

Vince
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Old 12-17-2008, 06:13 PM
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Have It welded with a cast rod, IMO Its not hard to do. I did a little a couple years ago, Preheat,postheat, cover in dry sand or dry cement and let cool slowly.
Shane
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Old 12-17-2008, 06:50 PM
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I agree with Vince fully. Most of the rams horns manifolds are so old at this point and fatiqued beyond there usage regardless of what they are coated in They still crack. The last set I seen that started with a crack resulted in removal in several pieces. Last I heard you could still get replacement rams horns manifolds from chevy but I would think they have been discontinued by now. However being they are a popular manifold, many after market companies still offer them, do a search on yahoo or google and many sources will pop up.
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Old 12-18-2008, 08:26 AM
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It can be welded. Not easily, but possible. Yes, the coating does need to go. There are a couple of ways to go about the weld but I,ll save the typing if you plan on scrapping and replacing.
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Old 12-18-2008, 08:27 AM
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Sure it can be welded, but it will look like cr^% IMHO.

Vince
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Old 12-18-2008, 08:40 AM
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If it's down low by the collector then looks probably aren't so important (unless in a street rod or something exposed)?

In a pinch you can fill in cracks with furnace cement - usually lasts well under a year, but it's a quick dirty fix (especially when you have hard to access / rusted on exhaust manifolds).
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Old 12-18-2008, 05:03 PM
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Ram-horn manifolds...

Hi,speedwaymotors.com sells them,decent product,i bought a set.but couldnt use them because they hit my steering shaft. sold for $59.95 for each.
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