Cam shaft core materials

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Rick Finsta
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Re: Cam shaft core materials

Post by Rick Finsta » Thu Sep 28, 2017 7:36 am

It just occurred to me that you can also potentially have your current cam reground. Fill out the spec sheet on Mike's site - he's super responsive in my experience!

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Re: Cam shaft core materials

Post by BBO Omega » Thu Sep 28, 2017 11:01 am

I plan to do that. First I want to check out my lower end. If there is any damage, I will likley upgrade to a 496 Rotataing assembly from RR and Cam requirement will be dictated then.
73 Omega, 468 BBO, 4.185 ICON Pistons,RR/Wenzler Heads with HS 1.7 rockers and PAC 1220X Springs,J&S 5-main Halo with Billet Caps, .590I .580E 242I 256E HR Cam, 1000hp Carb,2" x 3 1/2" headers,Coan 2900rpm Conv.,TH400,3.73 12 bolt,11.32/118

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Re: Cam shaft core materials

Post by pdq67 » Sun Oct 01, 2017 2:02 am

BBO Omega wrote:
Thu Sep 28, 2017 11:01 am
I plan to do that. First I want to check out my lower end. If there is any damage, I will likley upgrade to a 496 Rotataing assembly from RR and Cam requirement will be dictated then.
May I ask who, "RR", is?

Thanks,

pdq67

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Re: Cam shaft core materials

Post by BBO Omega » Sun Oct 01, 2017 10:12 am

Rocket Racing. They sell a bunvh of new, strong parts for Oldsmobiles. Blocks, Billet Cranks, Cylinder Head / Intake Package, etc.
73 Omega, 468 BBO, 4.185 ICON Pistons,RR/Wenzler Heads with HS 1.7 rockers and PAC 1220X Springs,J&S 5-main Halo with Billet Caps, .590I .580E 242I 256E HR Cam, 1000hp Carb,2" x 3 1/2" headers,Coan 2900rpm Conv.,TH400,3.73 12 bolt,11.32/118

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Re: Cam shaft core materials

Post by la360 » Sun Oct 01, 2017 6:07 pm

Thanks for your replies Mike, I'm not sure what kind of profile I'm going to run as yet. I may look at doing the blanks and leaving them round for now, and mill the lobes after heat treatment.
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Re: Cam shaft core materials

Post by joe 90 » Sun Oct 01, 2017 8:31 pm

la360 wrote:
Tue Sep 19, 2017 6:33 pm

Also, what are some instances where you've seen a core break?


One Friday afternoon, mechanic was just trying to finish off a rebuild of a hotted up SR20VE.
That's essentially the hottest version of a Nissan SR20 , the VE being Nissan's answer to VTEC.
The cams had just come back from being reground (unless they were brand new aftermarket ones, can't remember).


Anyway mr mechanic was just tightening one up at the cam caps and........BANG.
It's now in 2 pieces.


No idea what that one was made from but guessing very hard and very brittle and the cam caps should always be tightened up evenly and a bit at a time.

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Re: Cam shaft core materials

Post by la360 » Sun Oct 01, 2017 9:24 pm

Has any testing been done with steels like H13 and D2 tool steel?
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Re: Cam shaft core materials

Post by CamKing » Mon Oct 02, 2017 11:25 am

la360 wrote:
Sun Oct 01, 2017 6:07 pm
I may look at doing the blanks and leaving them round for now, and mill the lobes after heat treatment.
Then you would have to go with a tool steel, that can be tru-hardened. It'll much slower to machine, and slower to grind.
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Re: Cam shaft core materials

Post by la360 » Thu Oct 05, 2017 8:41 pm

What kind of rockwell hardness is sought? I know some tool steels will go to the 60-62 Hrc range, not sure about case hardened 8620 though.

Thanks in advance
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Re: Cam shaft core materials

Post by CamKing » Fri Oct 06, 2017 11:46 am

la360 wrote:
Thu Oct 05, 2017 8:41 pm
What kind of rockwell hardness is sought? I know some tool steels will go to the 60-62 Hrc range, not sure about case hardened 8620 though.

Thanks in advance
We carborize the 8620 to 60-62rc, .100" deep
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Re: Cam shaft core materials

Post by CamKing » Fri Oct 06, 2017 11:48 am

BTW, if you're going to make cores, you should check with the company that's going to grind them, and ask them about materials.
We charge twice as much to grind the tool steel cams, and they require a special grinding wheel, that many cam grinding companies may not have on the shelf.
Mike Jones
Jones Cam Designs
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jonescams@bellsouth.net
http://www.jonescams.com
(704)489-2449

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