Re: Best oil pumping lifters ??
[Re: okie]
#1892583
08/15/15 08:22 PM
08/15/15 08:22 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Which lifters will pump the most oil up the push rods ? On a 70 383, don't ask. I have a problem on my block and I have to run hollow push rods so i need a set of good pumping lifters in it. Which ones pumps the best. Thanks I didnt think the lifters pumped up any oil.. just the oil pressure... but I dont know much about hyd lifters... I am use to solid lifters
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Re: Best oil pumping lifters ??
[Re: okie]
#1892668
08/15/15 11:03 PM
08/15/15 11:03 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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It sounds like the cam bore on #4 is a bit over sized... see if a bearing company can make you a bearing over sized... if they dont have one already... or have a machine shop make one... I have never had a cam bearing spin... but I do have to size the ID of the bearings to fit the cam edit the cam should spin with your hand
Last edited by MR_P_BODY; 08/15/15 11:05 PM.
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Re: Best oil pumping lifters ??
[Re: okie]
#1892856
08/16/15 10:30 AM
08/16/15 10:30 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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The hole is under sized and that is what compresses the bearing, I can't find any one around here to hone it out any. I've done had it rebuilt 3 times and I can't afford to do it again. He put and under sized bearing in it last time and I thought it was fixed untill I got it back in and running. I haven't been able to find another block around here are I would have built another engine. I know some lifters pump up more oil than others I just need to find out which ones is the best.It runs all right long as the lifters are oiling the valves If your talking the cam being to tight we use a old cam with grooves cut in the bearing locations to size the bearing.. put it in and turn it so it cuts the bearings that are tight
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Re: Best oil pumping lifters ??
[Re: okie]
#1892894
08/16/15 11:46 AM
08/16/15 11:46 AM
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Joined: Jun 2010
Posts: 1,144 wellington ohio
68-scatpack-rt
In thin ice
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In thin ice
Joined: Jun 2010
Posts: 1,144
wellington ohio
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I just went through the dreaded mopar tight cam deal.
Mine had zero clearance on #2 cam bearing. Bearing didn't spin but was destroyed.
We put the cam in a lathe and polished the journals to obtain the clearance we needed.
unions....the folks who brought you the weekend!
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Re: Best oil pumping lifters ??
[Re: Stanton]
#1894296
08/18/15 12:30 PM
08/18/15 12:30 PM
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Joined: Nov 2009
Posts: 3,410 Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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I have been hearing/seeing this 'cam with notches' thing for a long time. I hadn't ever had the tight bearing problem in the past, but have it now. Does anybody have a pic of a cam they have cut the notches in?? Do you cut the notch straight across the journal or at an angle?? Thanks.
If you like drag racing, support your local track.
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Re: Best oil pumping lifters ??
[Re: CHAPPER]
#1894318
08/18/15 12:55 PM
08/18/15 12:55 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have been hearing/seeing this 'cam with notches' thing for a long time. I hadn't ever had the tight bearing problem in the past, but have it now. Does anybody have a pic of a cam they have cut the notches in?? Do you cut the notch straight across the journal or at an angle?? Thanks. I dont have a pic of mine but I cut them on a angle. I used a .040 cut off wheel on my die grinder
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Re: Best oil pumping lifters ??
[Re: Stanton]
#1894395
08/18/15 02:30 PM
08/18/15 02:30 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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A. Mopar cam bores have a tendency to run small. It is not a new problem. It can be solved with a hone.
B. Core shift, no, because machining is done after the casting process. BUT, the blocks change shape as they age and the internal stresses are relieved. It is not unusual for a cast iron block to have a couple of thousandths of movement from stress relief. Casting shift would be more like it.
C. The textbook way to take care of a tight bearing is to blue it, test fit it, then scrape the parts of the bearing that rub. It can be done very artfully, however it's much more difficult on a cam bearing because of the lack of space in which to work.
D. The slotted cam journal works, too, but may leave a rougher surface, although it doesn't seem to make a difference to the engine.
E. Machining down the diameter of the cam journal to get a proper fit should be pretty easy for a decent shop, as another way to fix this.
F. I cannot imagine a machine shop so helpless as yours sounds like. Maybe a trip to OKC is in order, or else to a better local shop? They do not sound like people I'd trust with my numbers block.
Good Luck, R.
Last edited by dogdays; 08/18/15 02:31 PM.
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Re: Best oil pumping lifters ??
[Re: okie]
#1894497
08/18/15 03:58 PM
08/18/15 03:58 PM
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Joined: Jun 2010
Posts: 1,144 wellington ohio
68-scatpack-rt
In thin ice
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In thin ice
Joined: Jun 2010
Posts: 1,144
wellington ohio
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A few minutes per journal on the lathe polishing is a way better option than hogging out new cam bearings with a crude cutter, in my opinion.
When I brought the "cam cutter" up to my machinist, he looked at me like I was nuts. He said......"yeah, that's not happening and having my name on it".
I know it's fairly common, but I can't see why when polishing the journals is so simple.
unions....the folks who brought you the weekend!
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Re: Best oil pumping lifters ??
[Re: okie]
#1894788
08/18/15 09:22 PM
08/18/15 09:22 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I guess I'm going to wait and see if I have to have surgery and if I do as soon as I get over it I guess I will try to pull the motor back out. Can i just pull the intake off and the lifters and pull the cam out and get a new cam bearing put in with out tearing the motor back down? I'll have to find me a new shop that can maybe do it right so I don't have to worry about it any more. Thanks for the info. You dont need to pull the engine.. just the radiator and the front of the engine... I have cut the bearings out without knocking them out... a hack saw blade and no handle..just rapped tape around it..I broke about 1/2 the blade off and spit the bearing... see if you can bend it and pull it out with pliers(needle nose).. then(do this first thing... see if you can turn the bearing sideways to get it through the top drain back hole.. if you can great.. if you cant you will need to knock out all the front bearings and start stay way..... at worst you might have to drop the pan.... if you get the bearing/s in and its still wont spin with your fingers your gonna have yo size the bearing with a old cam and slits
Last edited by MR_P_BODY; 08/18/15 09:23 PM.
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Re: Best oil pumping lifters ??
[Re: okie]
#1894820
08/18/15 09:48 PM
08/18/15 09:48 PM
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Joined: Jan 2003
Posts: 12,078 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,078
Benton, IL.
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Saw my first big block cam replacement that wouldn't spin in the block back in the early 70s. Also saw a nice fresh 440 spin one cam bearing and ruin that block. Ever since, I have kept a cam laying around with the slots cut in the bearing journals. I have used it on ALL big block cam replacements for 40 years and haven't had a cam bearing problem since.
It has had to cut it's way into more than one engine, but it had always done the job. There are more precise ways to go about this, and going that way is good. But grinding the bearings into submission with a grooved cam has never presented a problem in my experience.
Master, again and still
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Re: Best oil pumping lifters ??
[Re: okie]
#1894937
08/18/15 11:15 PM
08/18/15 11:15 PM
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Joined: Oct 2005
Posts: 8,872 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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I have cut the bearings out without knocking them out... a hack saw blade and no handle. How do you reach the 4th bearing with 1/2 of a hacksaw blade ? How do you keep the metal filings out of the motor ? If the bearing spun in the bore, it should just about fall out. It may come out stuck to the cam - had that happen !!
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