Re: H with a cracked manifold ???

Posted by Randy as in Randy-IA on June 11, 2006 at 19:09:11 from (207.177.83.77):

In Reply to: Re: H with a cracked manifold ??? posted by old on June 11, 2006 at 14:09:56:

Whoa now ! I didn't say it wouldn't work ! ;+) I said it would drive you crazy and probably not last long , just because the cast is already crystalized and you can't undo that . The old smithy here in my neighborhood welds cast all the time but he has a forge to heat it in and cool it slow . He told me it has to be about a dull red to weld it good and it takes hours to cool down , sometimes overnight in fire heated sand to do the best job of preventing it from creating stress cracks . But manifold cast is the poorest form of cast iron and crystalizes due to the thousands of heat/cool cycles . Nickle rod is good but ask your welding supply house about cast iron rod . We have some at work but since I don't even know how to weld I've never used it . I do though know plenty of welders and help with it all the time at work so I've been around it plenty . Brazing is easier though and the cast doesn't get as hot so it doesn't crack as easy while it's cooling . It just doesn't look very good in my opinion . I've been told silver solder works well too but I've never seen that done to a manifold . It's melting point is above the temp's that the exhaust can produce . Good luck ! ...Randy

By the way , I'm the same way Old , don't tell me I CAN'T do something . My motto is - If there's a will , there a way . I have to find those way's since I got no friends here in Iowa so I have to do things on my own or sometimes with my BIL .

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• Re: H with a cracked manifold ??? old 20:56:21 06/11/06 (0)

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