Re: What do you think causes this .........................
[Re: jnkgal]
#272799
03/31/09 11:00 PM
03/31/09 11:00 PM
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Joined: Jun 2003
Posts: 190 Wilmington,NC
I go fast
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member
Joined: Jun 2003
Posts: 190
Wilmington,NC
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Quote:
Quote:
This problem is something that happens more and more to flat tappet cams these days , it's due to the changes made in modern motor oils . they have removed most of the phousphorous and zinc in the oil which causes flat tappet cams to wipe out a lobe and lifter . go onto comp cams web site and they will give you more info on this . if your wondering why this dosen't happen to new car engines it's because they all run roller cams which see less friction due to the roller wheel. you can buy oil that still have high levels of these elelments but they are label for off rode use only and can't be used in any car with a catalytic converter .The two brands I know of are pensoil racing oil and one of the Royal purple blends
been using rotella diesel 15/40
Rotella isn't the oil it used to be.Zinc content has been significantly reduced over the last 1 1/2 yrs..
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Re: What do you think causes this .........................
[Re: jnkgal]
#272801
03/31/09 11:11 PM
03/31/09 11:11 PM
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Joined: Apr 2007
Posts: 4,525 Daisyland USA
jnkgal
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Daisyland USA
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My piggy bank is broke now lol is there anything more affordable than these pensoil racing oil and one of the Royal purple blends ? race gas is high enough lol
"A goal without a plan is just a wish."
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Re: What do you think causes this .........................
[Re: jnkgal]
#272802
03/31/09 11:15 PM
03/31/09 11:15 PM
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Joined: Mar 2003
Posts: 15,491 the boonies
aarcuda
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I Live Here
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Posts: 15,491
the boonies
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Re: What do you think causes this .....................
[Re: jnkgal]
#272804
04/01/09 10:08 AM
04/01/09 10:08 AM
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Joined: Jan 2005
Posts: 1,527 minnesota
Kirby
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minnesota
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Re: What do you think causes this .....................
[Re: Kirby]
#272805
04/01/09 10:35 AM
04/01/09 10:35 AM
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Joined: Jan 2003
Posts: 75,080 U.S.S.A.
JohnRR
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Gotta love this gal!
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Re: What do you think causes this .....................
[Re: MoparforLife]
#272806
04/01/09 10:46 AM
04/01/09 10:46 AM
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Joined: Jan 2003
Posts: 75,080 U.S.S.A.
JohnRR
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Quote:
The portion where that circle is isn't/shouldn't have any contact with the camshaft.
The circle is created by the rotating of the lifter frm the outer edge of the circle to the edge of the lifter if it's not a .904 speced lobe ramp .
I'd be rotating the engine over on this RACE MODER and what the rotation of the new lifter in that bore vs. the others .
As far as the size of those cooling slits , think about how thick the gasket is and the fact that the holes in the block vs. the head don't line up unless you have a late block with the figure 8 looking holes, there isn't a lot of water flowing thru it unless it's a figure 8 block with a big rectangle hole gasket.
My WAG is that the big slit is an early gasket design , the Mr. Gasket steel shims are still like that as was what I think were the original steel shims in my 69 383 , the small slit is probably the evolution of the gasket when the block holes got elongated to keep the water flow thru them somewhat the same ???
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Re: What do you think causes this .....................
[Re: JohnRR]
#272807
04/01/09 12:27 PM
04/01/09 12:27 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
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Columbia, CT
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If the cam's lobe has teh same rough texture of the lifter bottom, dont waste more tiume sending more metal thru te engine. Just replace the cam. It could have been a bunch of things, but the fact that only one went south tells me its the lifter bore or preload. I would not use any cam taht ate a lifter. You caught it early and that's great. But trying to avoid the inevitable by trying a new lifter on the same worn lobe is just not good sense.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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