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Old 09-11-2004, 09:07 PM
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Cracked Exhaust Manifold? (pictures attached)

I pulled this Ram's Horn manifold out of my spare parts bin to check it out. I bought it used and don't recall noticing these cracks then. Are they superficial or is it junk and I'll have to hunt another #3989036 down?

thanks



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Old 09-11-2004, 09:32 PM
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Hard to tell but if I had to guess I would say you are fine I mean there is no space between the cracks that I can see in the pics.
Normally that metal is thick and heavy so I would assume that hair line cracks like that would not go all the way through and cause you any problems.

Good luck.
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Old 09-11-2004, 09:45 PM
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those are some wierd cracks on that ol' rams horn..... if it were mine i would just use it tell i find better ones... the cracks are not black so the exhaust gasses are not leaking out of them yet. i just wonder how the heck them cracks started! almost like some1 hit the manifold from the inside with a big punch at one time.
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Old 09-11-2004, 09:56 PM
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They probably came in contact with water when they were hot. I'd scrap them. you can find them on Ebay cheap, or you can get some headers.
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Old 09-11-2004, 10:03 PM
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Then again we must all say that we have seen completely rusted ones pitted and ready to die that still worked...
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Old 09-11-2004, 10:28 PM
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Cracks...

Doc here

Plug the collector with any kind of a tight seal, and fill it with water... If it dosen't weep... It's all good....

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Old 09-12-2004, 05:27 AM
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That is not an uncommon issue on the passenger side that usually has the heat riser. When it starts to leak, find another one and hope it has not had a long life with a heat riser.

Trees
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Old 09-12-2004, 02:11 PM
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Thanks! I'll figure out a way to plug it and try that water trick and see if it seeps. Yes, it's a RH mani so that's an interesting point about the heat riser. I bought this used a long time ago and never used it. I guess if it's not cracked thru - they are still usable but may be on 'borrowed' time so to speak.

thanks,
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Old 09-12-2004, 08:47 PM
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The thing is on it's way out, run it until you find another. I have welded these in a pinch, like on our dirt car to get it back into the main event. I think what you see there is the result of it being driven with a dead hole. Raw fuel and air are introduced and burned like a blow torch in the manifold which eventually does damage it. And splashing through an icy puddle or a inoperative efe don't help either.
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