Quote:
Originally Posted by slider2828
Just a newbie question, I assume if the cast is of good quality, would wall thickness of the base + density of the cast make it more resistant to cracking than a tubular steel manifold when going through 1000s of heat cycles?
I would assume steel like most metal loses integrity over time when heat cycled at the temperatures that an exhaust manifold reaches?
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I would think that is strictly based on the stresses the manifold sees. Hanging a 15-20lb turbo off the side, plus the movement of the downpipe may play a larger role than one thinks in whether or not it fails. It would behoove the owner to support the turbo with a drain support system and add the necessary flex section to the exhaust piping.
Ultimately, anything can crack given enough stresses and heat cycles.