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do exhaust manifolds have to be round?

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Old 02-19-2005, 02:09 PM
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do exhaust manifolds have to be round?

Thinking about making a set of turbo headers and I am wondering if there are benifits to a round header. I want to make a log style header and use square tube for the manifold.
Old 02-19-2005, 02:26 PM
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I've thought about useing square tubeing to and don't see why it can't work
Old 02-19-2005, 04:04 PM
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Car: 1984 Corvette
Engine: Turbo 350
Transmission: 4L80E with TCI T-Com
Does it work? Yes!
A square pipe will have slightley more flow resistance than a round pipe with the same area.
Will you notice any differance? Probably not.
Old 02-19-2005, 04:27 PM
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Thanks for the replies . Does any body know where to get oval tubing?
Old 02-19-2005, 05:03 PM
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Old 02-21-2005, 01:32 AM
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Square usually requires a larger crossection to flow the same, but more importantly, it will have more surface area for the same crossection, or more of an opportunity to transfer heat where you don’t want to.

OTOH, even a very inefficient turbo setup on a V8 can make way more power then what 99% of people could really use.

- mmp
Old 02-21-2005, 05:26 PM
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Thanks for all of the help and the link. When I get some time
Ill give it a try

Last edited by AustinT; 02-22-2005 at 09:15 PM.
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