Camshaft Steel

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gwrdriver
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Camshaft Steel

Post by gwrdriver » Sun Jan 26, 2014 3:37 pm

I have a friend in the UK who is building a "Seal" engine, a first-time builders I think. Per the photo the Seal is a 4-cylinder in-line model engine. He has asked me for a recommendation for a steel for the camshaft which would not required heat treating. He's reluctant to case-harden the cam for fear of distortion and in skimming over the Craftsmanship Museum Seal build web page I see where several of the builders experienced bowing when case-hardening their cams. I have no IC experience so I don't have a recommendation but I would like to help him if I can. So my question is, is there a steel he can use for a camshaft which would not need case-hardening but still wear reasonably well?
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GWRdriver
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Harold_V
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Re: Camshaft Steel

Post by Harold_V » Sun Jan 26, 2014 5:22 pm

Without knowing more, I think I'd select Stressproof. That may not be an option for folks in the UK, however.

GM, to my knowledge, has used ductile iron for the purpose, although I expect they've done some heat treat.

Harold
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gwrdriver
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Re: Camshaft Steel

Post by gwrdriver » Thu Jan 30, 2014 10:49 am

Ok, looks like there are no more responses so I've forwarded this suggestion on to my friend.
GWRdriver
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gbritnell
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Re: Camshaft Steel

Post by gbritnell » Sun Feb 02, 2014 9:29 am

Hi gwrdriver,
I had responded to your query on another forum so didn't reply here but for others that might be interested I generally use W-1 drill rod or as it's called other places, silver steel. I don't know how the trade designations compare from here to there. I don't harden my cams but I do harden the lifters so that there is a nice interface between the two surfaces. If a person wants a hardened cam then a cam grinder would be needed to finish it because in the hardening process some warpage will occur.
gbritnell

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gwrdriver
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Re: Camshaft Steel

Post by gwrdriver » Tue Feb 04, 2014 8:15 pm

Duly noted and passed along.
Thanks G
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Hudson Honey
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Re: Camshaft Steel

Post by Hudson Honey » Sun May 10, 2015 9:48 pm

I am the one that made the seal cam for the museum seal. It was O2 if I recall. Poor choice. I have since learned. ....A2 tool steel. Great stuff to work with.and can be hardened to a full 50-55 rockwell then ground. Does not warp...shrink...distort.....etc.

Think I still have the program for the seal in the computer at the museum.

Pamela

Hudson Honey
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Re: Camshaft Steel

Post by Hudson Honey » Sun May 10, 2015 9:53 pm

I made a pair of cams for an orndorf v 12 out of a2. They are 9" long and did not even slightly warp.

Pamela

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Re: Camshaft Steel

Post by Packard V8 » Mon Feb 12, 2018 7:00 pm

Any thoughts about using cast iron, as most OEM flat tappet cams? IIRC, billets of Durabar/Versabar are readily available. Just Parkerize and they're ready to go.

jack vines

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