Gen VI BBC cam oiling (sorta) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-05-2012, 02:42 AM
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Gen VI BBC cam oiling (sorta)

Okay, on the Gen VI BBC the camshaft has the nose machined for a retainer that bolts onto the front of the block and limits cam walk. Why doesn't it wear!?!? If oil is able to get on the nose to lube it then why doesn't it leak from behind the timing chain? What am I missing?






Greg

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Last edited by ekacpuc; 07-05-2012 at 02:57 AM.
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Old 07-05-2012, 04:41 AM
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There is a wear factor, but not near as much as the old flat tappet cams. Roller cam engines have much less thrust wear because of the shape of cam lobes. Front retainer plate/thrust area is lubricated by oil cast off from front cam bearing, plus splash from chain. Also retainer plate is very hard/tough.. Oil does leak from between the timing set and block. But is minimal.. On the older blocks I sometimes create an oil leak in front to better lube the thrust on a flat tappet cam setup.
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Old 07-05-2012, 09:53 AM
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Not sure about the Gen 6 block, as I haven't seen one, but previous blocks had oil return holes from the lifter valley to the timing area, so oil ran down the front of the block inside the timing cover also.
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Old 07-05-2012, 02:35 PM
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Cool. I figured since GM did it that it's good to go. Converting my mark IV to run a VI cam (yes boss is ready for retainer dispite what some people say).


I was under the impression that hyd tappet lobes are ground at an angle. The lifters keep the cam from walking, plus the angle promotes lifter spin for even wear. So since hyd rollers can't have that angle there isn't anything to hold the cam in, therefore more thrust/cam walk pressures are experianced with hyd roller cams...



Greg
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Old 07-05-2012, 04:30 PM
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Quote:
Originally Posted by ekacpuc View Post
Cool. I figured since GM did it that it's good to go. Converting my mark IV to run a VI cam (yes boss is ready for retainer dispite what some people say).


I was under the impression that hyd tappet lobes are ground at an angle. The lifters keep the cam from walking, plus the angle promotes lifter spin for even wear. So since hyd rollers can't have that angle there isn't anything to hold the cam in, therefore more thrust/cam walk pressures are experianced with hyd roller cams...



Greg
The flat tappet cams (as you know) are angled to provide rotation to the lifters, plus the angle helps offset the thrust caused by the distributor/oil pump drive gears. With a roller cam, the roller lobes are flat so there's no thrust induced by the lobes/lifters, but there's still the gear drive to the distributor and oil pump that causes the cam to walk forward- so the cam plate is used.

I've seen the BBC blocks like you have, that have the bosses for the cam retainer. I believe they were also used for reverse rotation cams, like for marine use.
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Old 07-06-2012, 05:48 AM
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I have 2 blocks like that... One i know isn't marine. I was originally told it was for a gear drive.

Last edited by ekacpuc; 07-06-2012 at 05:56 AM.
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Old 07-06-2012, 01:44 PM
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Quote:
Originally Posted by ekacpuc View Post
I have 2 blocks like that... One i know isn't marine. I was originally told it was for a gear drive.
The gear drive rotated the cam in the reverse direction. "Marine" may be a misnomer, though.
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