Crankshafts - Team Camaro Tech
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post #1 of 8 (permalink) Old Feb 8th, 07, 11:11 PM Thread Starter
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Crankshafts

Is a 'nodular' crankshaft cast or forged?

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post #2 of 8 (permalink) Old Feb 8th, 07, 11:36 PM
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Re: Crankshafts

"nodular" iron cranks are cast ...

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post #3 of 8 (permalink) Old Feb 8th, 07, 11:46 PM Thread Starter
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Re: Crankshafts

Thanks!

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post #4 of 8 (permalink) Old Feb 9th, 07, 06:21 AM
 
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Re: Crankshafts

I think there may be gray-iron cranks in some of the other really low performance engines, but not ours, ductile or nodular-iron and forged in ours and SCAT sells a cast steel 9000 series crank as well as several grades of forged steel..

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post #5 of 8 (permalink) Old Feb 9th, 07, 08:36 AM
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Re: Crankshafts

Actually, the only nodular iron in Chevy small blocks is the 400. I've been told that all big block cast cranks are nodular but haven't been able to verify that.

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post #6 of 8 (permalink) Old Feb 9th, 07, 10:02 AM
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Thumbs down Re: Crankshafts

Quote:
Originally Posted by MyBoTy View Post
Actually, the only nodular iron in Chevy small blocks is the 400. I've been told that all big block cast cranks are nodular but haven't been able to verify that.
'actually' - only the small block small and medium journal cast cranks like the 305/350 (3.48") are "nodular" iron ...
Even the lowly 283 had a cast nodular iron crank starting in 1964 (refer to Service Bulletin #DR-684) as were the 327 and 307 cranks.

The GM 400 cast cranks are ductile iron, not refered to as nodular by GM, and always have been - to help them absorb and live with the increased vibration these engines experence. They are commonly wrongly identified ...

(edit) The prcesses are the same and interchangable - GM spec.s different material for the large journal 400 cranks and refers to the material as "ductile" - I would guess just to differenciate the two.
See following posts for calarification - if at all possible
Bottom line is that all the small (and big) block cast cranks have used "nodulizing" methods in the cast iron used for them to decrease cracking since the mid 60's ...

And yes, the big block cranks used in popular lower HP applications, like the L-35/LS-3 and LS-1's are 'nodular' iron from 1968 on.

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Last edited by Vintage 68; Feb 9th, 07 at 05:58 PM. Reason: See following posts
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post #7 of 8 (permalink) Old Feb 9th, 07, 05:30 PM
 
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Ductile-iron IS nodular-iron!!

You take some molten gray-iron and pour it into an inoculating ladle that is tall and not very big around that has a step in its bottom where solid mag. metal is placed down low so the molten metal will cover it quickly and voila, you get ductile/nodular-iron..

It's a bit more involved than this, but that's the gist of it...

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post #8 of 8 (permalink) Old Feb 9th, 07, 05:52 PM
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Thumbs up Re: Crankshafts

Paul, you're correct, they are the same process.
GM specifies specific nickle and copper content in their 'nodular' materials along with higher silicone contents.
The 400 were refered to as 'ductile' in the materials data - I would only guess due to differences in the formulation over the earlier (remember, clear back to 64) small and medium diameter cranks. The 400 cranks still used magnesium as the 'nodulizer' but had higher silicone/chromium content.
There is an SAE paper, that discusses the material choices, that was published about the same time the 400's appeared in the early 70's discussing the crank engineering.
I tried to use the same terms used in the posts so the issues didn't get crouded out by the facts ...
I'll go back and slightly edit the reply so it's not so confusing when searched.

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