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03-01-2021, 04:11 PM | #1 |
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59 Camshaft oiling
So I am sending a cam to be ground. I discovered mine are dissimilar. Both came out of 59's. One says Ford. Both say 21A. Both have same timing gears when dismantled.
The one marked ford/21A has two slots. One letting oil in/out/under into oil pump and a slot letting oil in/out/under into the valve valley. The one marked 21A only has the one letting oil flow back and forth to oil pump. Anyone have any preference? thoughts on oil pressure? which one would you grind and install in your rebuild. |
03-01-2021, 05:51 PM | #2 |
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Re: 59 Camshaft oiling
The one with the journals not worn, I went through some cams and found 1/2 of them had undersized journals, , as much as .010 difference between the center and end journals
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03-01-2021, 06:01 PM | #3 |
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Re: 59 Camshaft oiling
I will double check when I get home and edit if needed. From memory, if any of the 3 journals are less than 1.7955 for 78, 81A, 59A it should be discarded unless you can find oversize bearings which i don't think they make anymore, maybe NOS somewhere.
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Sometimes, ingenuity gets in the way of sense and sanity. Last edited by Will D; 03-01-2021 at 08:10 PM. Reason: Number correction |
03-01-2021, 06:04 PM | #4 |
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Re: 59 Camshaft oiling
I know Durabond make .010 under.
Last edited by Tim Ayers; 03-01-2021 at 08:13 PM. |
03-01-2021, 07:00 PM | #5 |
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Re: 59 Camshaft oiling
1.794 is minimum journal size for standard bearings in a street engine.
I would not put .010 OVER bearings in a street engine. .010 UNDER are available. Another core is better than grinding the journals undersize due to cost. Just take a mic with you when you go buying cores. |
03-01-2021, 07:04 PM | #6 |
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Re: 59 Camshaft oiling
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03-01-2021, 07:18 PM | #7 |
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Re: 59 Camshaft oiling
Pete. what is the second groove for?
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03-01-2021, 08:09 PM | #8 |
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Re: 59 Camshaft oiling
My book says to replace if any journal measures less 1.7955
I would do what Pete suggests as that is real world, tried and tested. Does the cam with the double have a "C" in front of the "21A"?? I have a camshaft marked on the snout, "C59A" (Canadian version) and it has the double slots.
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03-01-2021, 08:10 PM | #9 |
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Re: 59 Camshaft oiling
Thank you Tim, that's pertinent information.
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Sometimes, ingenuity gets in the way of sense and sanity. Last edited by Will D; 03-01-2021 at 08:28 PM. Reason: Typo |
03-01-2021, 08:14 PM | #10 | |
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Re: 59 Camshaft oiling
Quote:
Thanks, Pete. That was my error. |
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03-01-2021, 10:43 PM | #11 |
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Re: 59 Camshaft oiling
I dunno; I tend to be a bit anal, but whenever I get a camshaft reground, I, or the camgrinder, needs to put a centre in the nose of the cam in order for him/her to be able to grind the new profile...
Now, just suppose the centre isn't 'spot on'; say it's .010" out. It won't be, but we'll use that as an example; easier to imagine the following scenario. Now you get the situation that when the cam is installed all the newly ground cam lobes are eccentric to how the cam is running in the block, with the frontmost cylinders having the most runout [on account of the .010" eccentric centre], reducing in runout progressively toward the rear of block, where the camshaft has the factory centre. So...if, after having the camlobes ground between the centres [one factory, one newly machined], we install our nice new .010 undersize [that's right eh Pete?], measure the installed inside diameter of each cam bearing, we can now grind the three cam journals to the correct clearance, between those very same centres, confident that the camshaft will run dead true with correct clearances. Just the way I do it....
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03-01-2021, 11:59 PM | #12 |
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Re: 59 Camshaft oiling
Good explanation Brian. if the factory center is off, we assume it moved from abuse, or was off from new? also, the extra slot in the OP's question, why? what does it feed, the fuel pump push rod?
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03-02-2021, 01:47 AM | #13 |
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Re: 59 Camshaft oiling
the extra slot in the OP's question, why?
I dunno, every camshaft I've ever seen has both grooves. our stuff down here is Canadian. Do the American cams only have the one rear groove?
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03-02-2021, 12:15 PM | #14 |
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Re: 59 Camshaft oiling
OP shows 2 cams, one with two slots, one with one slot.
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03-02-2021, 08:36 PM | #15 |
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Re: 59 Camshaft oiling
Did you see the answer to your post on the HAMB on this subject that I left?
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03-03-2021, 01:00 AM | #16 |
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Re: 59 Camshaft oiling
I couldn't find a C indicating Canadian. Good thought though.
Ronnie I did see your response and thanks. I sent the single relieved/slotted one in today. And yes it passed factory cam bearing tolerance. I think the single slotted cam will run more psi. and volume of oil elsewhere in the engine anyways. Last bearing i'll be worrying about is the rear cam. Thanks for good feedback gents |
03-03-2021, 04:51 PM | #17 | |
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Re: 59 Camshaft oiling
Quote:
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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