I've heard great things about doing engine internals. in the case of the Isuzu Impulse Rs pistons, they already came forged. When rebuilding, most of us just hsip them in for Cyro-treating and it makes everything brand new. The deep-freezing is supposed to force the stress' out of the metal.Originally Posted by hybrid90accord
As for things like gears, that's no so much of a good idea. By cryo-treating thin pieces, this causes them to be "fragile" in a way. Things chip off easier and stuff, of course, breaks easier. I don't know how, but most cyro-treaters advise against it.





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