Free 30-30 cam profile for cam grinding machine

[G B.]

About 15 years ago I sent a good used GM 30-30 cam from an original HG 327 to Erson Cams in CA. I paid them about $1000 to make five accurate copies for me.

Those cams are all gone now, but I still have the lobe profile Erson used in their cam grinding machine. I'll send it for free to anyone who wants it. Just tell me where to send it in an email to my Double Top Secret address: jerrybramlett@comcast.net.

At the time I thought most aftermarket 30-30 cams were inaccurate. I still don't trust them completely... modern reproductions are just no damn good.

MVC-017S.JPG

[Duke W.]

Re: Free 30-30 cam profile for cam grinding machine

Can you measure the "heel to toe" dimension? That would be from the top of the lobe to the base circle 180 degrees across.

The actual dimension from the GM drawing is 1.52284" nominal, +/- .004" max allowable lobe runout added to base circle tolerance.

(The 30-30 cam is "single pattern" cam - same lobe used on both inlet and exhaust.)

I'm interested in the ratio to lobe master to finished camshaft dimensions. I think it's an "industry standard" for most traditional mechanical cam grinding lathes.

I think the best place for this lobe master is the Corvette Museum. You should contact them. A nice display would be the 30-30 cam engineering drawing, an actual cam grinding machine or at least a good photo, and the 30-30 lobe master. Few have any idea of how cams are designed and manufactured, and museums are meant to EDUCATE!

Duke

[Terry M.]

Re: Free 30-30 cam profile for cam grinding machine

[QUOTE=G A Bramlett (135);911085]About 15 years ago I sent a good used GM 30-30 cam from an original HG 327 to Erson Cams in CA. I paid them about $1000 to make five accurate copies for me.

Those cams are all gone now, but I still have the lobe profile Erson used in their cam grinding machine. I'll send it for free to anyone who wants it. Just tell me where to send it in an email to my Double Top Secret address: jerrybramlett@comcast.net.

At the time I thought most aftermarket 30-30 cams were inaccurate. I still don't trust them completely... modern reproductions are just no damn good.[/QUOTE

Jerry,
If you are agreeable to the museum donation, I know who to contact. I doubt they hang out on this board. Your donation will be tax deductible, just LMK.

[G B.]

Re: Free 30-30 cam profile for cam grinding machine

I appreciate your offer, Terry, but I promised the lobe master to a member who emailed immediately after my initial post.

[Terry M.]

Re: Free 30-30 cam profile for cam grinding machine

I appreciate your offer, Terry, but I promised the lobe master to a member who emailed immediately after my initial post.

No problem.

[G B.]

Re: Free 30-30 cam profile for cam grinding machine

The lobe measures ~5.5" x 5.25".

[Duke W.]

Re: Free 30-30 cam profile for cam grinding machine

Thank-you.

Duke

[Terry M.]

Re: Free 30-30 cam profile for cam grinding machine

Mr. McManmon,
I am the member that received the lobe master from Jerry. I would happily donate it to a museum as you mentioned. However, it would come with a condition. That is, Jerry Bramlett should get the credit and any tax deduction that might be appropriate. Just let me know how you wish to proceed. Thanks.

Terry McCarthy

[Terry M.]

Re: Free 30-30 cam profile for cam grinding machine

Mr. McManmon,
I am the member that received the lobe master from Jerry. I would happily donate it to a museum as you mentioned. However, it would come with a condition. That is, Jerry Bramlett should get the credit and any tax deduction that might be appropriate. Just let me know how you wish to proceed. Thanks.

Terry McCarthy

Terry,
You have mail.