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Old 09-05-2017, 01:24 PM   #1
d.j. moordigian
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Default "Moon cam"...any information?

I have a reground B cam done by Moon speed shop. I called to get some information from them, but got zero feedback from them. I also talked with
Jim Brierly on the phone, that was a GREAT chat, but also no help.

Any of you run a " Moon 3/8 Super" and have any information, event numbers
and lash setting? Any of you have real info would help. I do know somebody
with a "cam doctor" as a last resort..

Thanks,
Dudley
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Old 09-05-2017, 01:30 PM   #2
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Default Re: "Moon cam"...any information?

Have you measured it? That will at least tell you lift
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Old 09-05-2017, 01:32 PM   #3
Rex_A_Lott
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Default Re: "Moon cam"...any information?

I cant help with real numbers, and if Jim Brierley couldnt, well you may be SOL.
I would think if you had a bare block, a dial indicator, and a degree wheel you could get pretty close. I'd do that, then hit up the guy with the cam doctor and see how close the numbers are. Good Luck!
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Old 09-05-2017, 01:33 PM   #4
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Default Re: "Moon cam"...any information?

Look for old Moon catalogs on ebay
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Old 09-05-2017, 04:33 PM   #5
d.j. moordigian
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Default Re: "Moon cam"...any information?

I do appreciate the help,...I can run everything and get all the numbers. But my B block
has bushings for the cam, and this cam will not fit in my B.

The biggest problem for Jim and I was the valve lash,..which could be from .012" too
.028",...gee, you pick a number, that's just wrong and I'm not going to do that,...yet.
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Old 09-05-2017, 05:04 PM   #6
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Default Re: "Moon cam"...any information?

You should be able to get reasonably close by measuring the clearance ramps. You will see a gradual lift as the valve begins to open, then change to a more rapid rise. Play with it until you find the point where the rate of lift increases and read the amount of lift on the dial indicator. This should be the approximate desired lash. This is assuming the cam was ground with clearance ramps. Or it could be like Isky's first cams. He didn't know about this so his cams just slammed the valves open. He said they were quite noisy but must have ran good. Moonshiners in the South liked them.

Last edited by 40 Deluxe; 09-05-2017 at 05:09 PM.
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Old 09-05-2017, 05:57 PM   #7
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Default Re: "Moon cam"...any information?

I believe Moon was grinding Potvin cams (Bill Jenks).
Potvin Super 3/8 for the V8 flathead would be .375" lift at 280 degrees duration.
.010 & .012 clearance.
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Old 09-05-2017, 06:27 PM   #8
Offy 220
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Default Re: "Moon cam"...any information?

Quote:
Originally Posted by 42merc View Post
I believe Moon was grinding Potvin cams (Bill Jenks).
Potvin Super 3/8 for the V8 flathead would be .375" lift at 280 degrees duration.
.010 & .012 clearance.
Pete1 who has Potvin [Moon] profiles may be able to help. Bill Jenks ground a couple of Potvin 3/8's camshafts for my 296"V8 in the 80's. Unfortunately Bill passed away several years ago. 42 Merc's specs are correct as he posted. I just went though my 296" and checked valve timing and reset valve lash. Bill Jenks did change lobe centers - the one I just checked is 114 degrees and another one I have is 118 - he stamped the info on the gear end - I can't remember why but it may had to do with idle RPM and lope. Pete1 is usually on the 'Early V8' forum.
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Old 09-06-2017, 10:21 AM   #9
d.j. moordigian
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Default Re: "Moon cam"...any information?

Quote:
Originally Posted by 42merc View Post
I believe Moon was grinding Potvin cams (Bill Jenks).
Potvin Super 3/8 for the V8 flathead would be .375" lift at 280 degrees duration.
.010 & .012 clearance.
Quote:
Originally Posted by Offy 220 View Post
Pete1 who has Potvin [Moon] profiles may be able to help. Bill Jenks ground a couple of Potvin 3/8's camshafts for my 296"V8 in the 80's. Unfortunately Bill passed away several years ago. 42 Merc's specs are correct as he posted. I just went though my 296" and checked valve timing and reset valve lash. Bill Jenks did change lobe centers - the one I just checked is 114 degrees and another one I have is 118 - he stamped the info on the gear end - I can't remember why but it may had to do with idle RPM and lope. Pete1 is usually on the 'Early V8' forum.
Ahhh,...Bill Jenks' did grind this cam, according to Moon. This gives me a
good starting point when I get a block too run the numbers. Boy!..280,..
not really what I was hoping for. The numbers @ .050" should tell the story.

Thanks for the help,
Dudley
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Old 09-06-2017, 10:29 AM   #10
BILL WILLIAMSON
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Default Re: "Moon cam"...any information?

You Guys know a LOT of cam stuff! For me, if it LOPES, I'm HAPPY!
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