The Ford Barn

3twinridges · 03-30-2023, 05:17 PM

Quote:

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 · 03-30-2023, 05:26 PM

Correct

flatjack9 · 03-30-2023, 07:13 PM

Stock 8BA has .300 lift.

Ol' Ron · 03-30-2023, 07:48 PM

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 · 03-31-2023, 09:41 AM

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

Merc Cruzer · 03-31-2023, 10:16 AM

Sponsored Links (Register now to hide all advertisements)

Quote:

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 · 04-01-2023, 09:09 AM

Found the marking.

Merc Cruzer · 04-01-2023, 09:57 AM

Quote:

Originally Posted by Tony, NY

Found the marking.

Thank you.

Merc Cruzer · 04-01-2023, 10:07 AM

Quote:

Originally Posted by flatjack9

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

Thanks again to TONY, NY

flatjack9 · 04-01-2023, 11:05 AM

So it does exist. Thanks.

rotorwrench · 04-01-2023, 07:44 PM

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

3twinridges · 04-01-2023, 08:26 PM

Quote:

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 · 04-01-2023, 08:32 PM

Quote:

Originally Posted by Tony, NY

Found the marking.

Merc Cruzer · 04-02-2023, 07:59 AM

petehoovie:

Thank you.

rotorwrench · 04-02-2023, 10:54 AM

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 · 04-02-2023, 11:42 AM

Quote:

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 · 04-09-2023, 12:27 PM

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 · 04-09-2023, 04:19 PM

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

Terry

Merc Cruzer · 04-09-2023, 04:55 PM

Quote:

Originally Posted by cadillac512

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

Terry

475

cadillac512 · 04-09-2023, 10:06 PM

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

Terry

03-30-2023, 05:26 PM	#22
KiWinUS Senior Member Join Date: May 2010 Location: Charlotte NC KiWi-L100 available here Posts: 2,963	Re: 1CM Camshaft Correct

03-30-2023, 07:13 PM	#23
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: 1CM Camshaft Stock 8BA has .300 lift.

03-30-2023, 07:48 PM	#24
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: 1CM Camshaft 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

04-01-2023, 11:05 AM	#30
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: 1CM Camshaft So it does exist. Thanks.

04-02-2023, 07:59 AM	#34
Merc Cruzer Senior Member Join Date: Jul 2010 Location: Conifer, Colorado Posts: 2,429	Re: 1CM Camshaft petehoovie: Thank you. Last edited by Merc Cruzer; 04-02-2023 at 08:04 AM.

04-01-2023, 07:44 PM	#31
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: 1CM Camshaft It was made to work with the new design rotator valves that came out in 1951.

04-02-2023, 10:54 AM	#35
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: 1CM Camshaft 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. Last edited by rotorwrench; 04-02-2023 at 11:11 AM.

04-09-2023, 12:27 PM	#37
Merc Cruzer Senior Member Join Date: Jul 2010 Location: Conifer, Colorado Posts: 2,429	Re: 1CM Camshaft 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

04-09-2023, 04:19 PM	#38
cadillac512 Senior Member Join Date: Apr 2019 Location: Kansas Posts: 922	Re: 1CM Camshaft Do you remember what rpm it was idling at? Sounds nice and crisp. Terry __________________ "It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up" 302

04-09-2023, 10:06 PM	#40
cadillac512 Senior Member Join Date: Apr 2019 Location: Kansas Posts: 922	Re: 1CM Camshaft I'll set my .030 over Merc with the 8CM cam at 475 and see what it sounds like...just for fun! Terry __________________ "It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up" 302