C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Stock crank question

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Old Oct 4, 2009 | 09:13 AM
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Drifting
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Default Stock crank question

How are journals on stock vette crank finished?
Is that just raw casting machined to dimensions or
are journals hardened in some way?
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Old Oct 4, 2009 | 09:26 AM
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engle1147
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Raw material is just machined then polished. If you want a stronger crank go with a forged product. The bearings are softer than the crank material...using non-technically speak on a properly machined jornals there should be an oil "cushion" in-between the contact points.
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Old Oct 4, 2009 | 12:39 PM
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OK, thanks! I ask because some european engines have stock cranks that are nitrited and if they are machined they are very soft under that thin coating.
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Old Oct 4, 2009 | 08:31 PM
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You'd have to do some research to see which of GM's cranks received this hardening process. Some did, but I don't recall which ones or which year cranks received it.

I do recall reading about certain processes GM uses to harden the journals and at least one company (probably more) still offers it. I saw it advertised in one of the mags.

Jake

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