1CM Camshaft

[Merc Cruzer]

I posted earlier requesting a picture of a 1CM "crankshaft" when I meant to say "camshaft".

Let me try this again, does anyone have picture of a 1CM camshaft?

Thank you.

[Merc Cruzer]

Btt

[KiWinUS]

Visually you will not see any difference from an EAB to a 1CM cam.

[Merc Cruzer]

Originally Posted by KiWinUS

Visually you will not see any difference from an EAB to a 1CM cam.

Thank you, I just want them for my files.

[flatjack9]

So far I have never seen a cam marked 1CM.

[40cpe]

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I have a Merc cam. It's been wrapped up for years. I'll look at it tomorrow.

[Merc Cruzer]

Originally Posted by 40cpe

I have a Merc cam. It's been wrapped up for years. I'll look at it tomorrow.

Thank you.

[cas3]

IIRC the one in my jalopy had EAB cast right on the blank. Only one I've had though

[V8 Bob]

Attached are pictures of two 8CM Merc cams I recently sold. Specs for the '49-'51 cams are .338"/.333" int./exh.

[flatjack9]

I have 8CM, 8BA, EAB and EA cams.

[Merc Cruzer]

I have pictures of the 8BA and EAA that came out of the old block and the new block. When I assembled the new block, after the machine work was finished, I used 1CM cam, but lost the pictures of it when my computer crashed.

[40cpe]

Originally Posted by 40cpe

I have a Merc cam. It's been wrapped up for years. I'll look at it tomorrow.

The cam I have is an 8CM. Sorry

[Merc Cruzer]

Originally Posted by 40cpe

The cam I have is an 8CM. Sorry

Thanks for looking. Still hoping someone out there, has one.

[KiWinUS]

Here are 4 NOS 8RT cams off the the grinder yesterday. Returning as “Smiley” cams.

[36coupe]

What’s a smiley cam?
What is the prerequisite for regrinding a 59 AB cam.
I would like the specs of a late Mercury cam, or a bit better. Going in early block with a merc crank, basically stock.
I have a few prewar and 40s cams.
How does a reground cam affect the drive train? Do you need to have longer valves or are the adjustable lifters enough to adjust the valves?
And lastly, what does it cost?
Thanks

[Ol' Ron]

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[36coupe]

I take it Smileys are the L-100 cam

[KiWinUS]

Originally Posted by 36coupe

I take it Smileys are the L-100 cam

Yea buddy.

[3twinridges]

If you take a stock 8RT cam, and regrind it, wouldn’t you have lower lift than the stock 8RT? Or are the lobes built up prior to the regrind?

JB

[KiWinUS]

No you have way more lift. Stock just over.300”L100 right at.370. Base circle is slightly smaller.
Lobes are not build up. This is a standard regrinding procedure

[3twinridges]

Originally Posted by KiWinUS

No you have way more lift. Stock just over.390” L100 right at.370. Base circle is slightly smaller.
Lobes are not build up. This is a standard regrinding procedure

I see, so the base is smaller where the lash is set, but the tip (tip of the lobe)is still about the same length, thus more lift?

[KiWinUS]

Correct

[flatjack9]

Stock 8BA has .300 lift.

[Ol' Ron]

Dealing with Small amounts of lift and duration, has little effect on the power output of the engine. Some but not much. I see no reason to spend a large amount of money for a few foot/pounds of torque somewhere in the cruse RPM of the engine. A Max#1 or 77B would add allot more for the same amt of $$$$$ Or maybe I'm missing something here??
Gramps

[Tony, NY]

This should be a 1CM cam. Hopefully another type didn't get mixed with my old parts.

[Merc Cruzer]

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Originally Posted by Tony, NY

This should be a 1CM cam. Hopefully another type didn't get mixed with my old parts.

Thank you for the post and pictures, any chance you can find the part number (1CM) stamped on them?

[Tony, NY]

Found the marking.

[Merc Cruzer]

Originally Posted by Tony, NY

Found the marking.

Thank you.

[Merc Cruzer]

Originally Posted by flatjack9

So far I have never seen a cam marked 1CM.

Thanks again to TONY, NY

[flatjack9]

So it does exist. Thanks.

[rotorwrench]

It was made to work with the new design rotator valves that came out in 1951.

[3twinridges]

Originally Posted by rotorwrench

It was made to work with the new design rotator valves that came out in 1951.

What was different about it? Were the journal faces tapered to rotate the valve? I think both the EAB and 1CM could be used with rotators. I am asking because I wonder if the 8CM can be used with rotators.

JB

[petehoovie]

Originally Posted by Tony, NY

Found the marking.

[Merc Cruzer]

petehoovie:

Thank you.

[rotorwrench]

My post in #31 only mentioned the one change that came with the 1CM cam for the Mercury cars since I was in too big a hurry to add that the automatic transmission was also introduced with the 1951 around February of that production year. The valve pockets started losing the hardened seats in the intakes. The actual change in the cam was likely for better low end torque. The Ford-O-Matic and Merc-O-Matic transmissions were designed to start out in 2nd gear. The 1st gear selection was for starting out with high cabin loads or with a trailer and could only be selected manually by the operator. They needed as much low end torque as they could get with a stock flathead.

The rotators didn't need a change in the cam to work but they changed valve springs and went with the cone cup type hold down for the retainers and shorter valve springs. They also changed the tappet clearances for this and the valves are about .020" shorter. The change in clearance was for the new valves only. I own two early 1951 Mercs and they have conventional valves and the 8CM cam so I use the 1949 thru 50 clearances on them. This isn't mentioned in the 1949 thru 51 Lincoln Mercury overhaul manual. Ford used the 8BA-6250-B cam for the change over till the EAB cam came out. The blocks reflected the 1BA change. This was all for the Automatic transmission changes plus the valve changes.

[Merc Cruzer]

Originally Posted by rotorwrench

My post in #31 only mentioned the one change that came with the 1CM cam for the Mercury cars since I was in too big a hurry to add that the automatic transmission was also introduced with the 1951 around February of that production year. The valve pockets started losing the hardened seats in the intakes. The actual change in the cam was likely for better low end torque. The Ford-O-Matic and Merc-O-Matic transmissions were designed to start out in 2nd gear. The 1st gear selection was for starting out with high cabin loads or with a trailer and could only be selected manually by the operator. They needed as much low end torque as they could get with a stock flathead.

The rotators didn't need a change in the cam to work but they changed valve springs and went with the cone cup type hold down for the retainers and shorter valve springs. They also changed the tappet clearances for this and the valves are about .020" shorter. The change in clearance was for the new valves only. I own two early 1951 Mercs and they have conventional valves and the 8CM cam so I use the 1949 thru 50 clearances on them. This isn't mentioned in the 1949 thru 51 Lincoln Mercury overhaul manual. Ford used the 8BA-6250-B cam for the change over till the EAB cam came out. The blocks reflected the 1BA change. This was all for the Automatic transmission changes plus the valve changes.

Good to know, since mine is a Merc-O-Matic. I have been very happy with the performance, since I rebuilt the engine with the 1CM cam, compared to the old engine with the EAA cam.

[Merc Cruzer]

For those of you that might wonder, what a 1CM camshaft sounds like in a stock (ok 60 over) but otherwise stock engine:

https://www.youtube.com/watch?v=-i8DkwbfNQ0

[cadillac512]

Do you remember what rpm it was idling at? Sounds nice and crisp.



Terry

[Merc Cruzer]

Originally Posted by cadillac512

do you remember what rpm it was idling at? Sounds nice and crisp.



Terry

475

[cadillac512]

I'll set my .030 over Merc with the 8CM cam at 475 and see what it sounds like...just for fun!
Terry

[Merc Cruzer]

That would be interesting.

[Ol' Ron]

I have several engines running rotators on a max#1 cam with no trouble. I believe the rotators will extend valve life.
Grams

[Merc Cruzer]

Love to hear an engine with a Max#1 at 750 rpm's.

[Ol' Ron]

The Nax #1 sounds pretty good and works well at low and cruise roms and give pretty good fuel mileage, In JWL;s book this is the only cam he tested in the stock engine. Good chaise.
Gramps