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  #1  
Old 07-08-2002, 12:48 PM
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tsteiner61 tsteiner61 is offline
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Default Camshaft question

Can you run hydraulic roller lifters on a hydraulic cam without ruining them? I understand that hydraulic roller lifters only give true performance benefits when used with cams that have a higher rate of lift than a plain hydraulic tappet can handle, but I've heard that using hydraulic roller lifters can increase cam longevity due to decreased friction.

Any help appreciated.
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Old 07-08-2002, 01:27 PM
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Default cam??

there are many things you and I could do. But not all are worth while. Unless you are running a roller cam you could spend your $$$ on other things and get more performance for your $$$. In terms of less friction Yes Iam sure there would be less.drag,at lest in theiry. As far as longevity it my or may not . the reson for this is as fallows. The hyd;and solid lifter cams are made of what is eqvalent to mild steel. the roller cams are ground on billet steell wich is much harder. There for the wheels on the roller lifters are also made of much harder billet steel. To use them on a standerd hyd;cam would cause the cam to waer out quickly. In this case I think you would do better to stick to what it came with. Happy trails. Dirty Dan
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Old 07-08-2002, 01:31 PM
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Thanks. I think I will.
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Old 07-08-2002, 04:38 PM
Doug Wilson Doug Wilson is offline
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Also, the cam profile is specificall ground for the type of lifter being used. A roller lifter on a flat tappet profile probably wouldn't even run.
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Old 07-08-2002, 04:40 PM
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That should read "specifically".
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Old 07-08-2002, 06:59 PM
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1972roadrunner 1972roadrunner is offline
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isn't the roller lifter also much taller than a regular lifter? i think i saw a pic in P.A.W and the diameter of the cam is actually smaller, but the lobe sizes still rise the same amount... i'm not sure, but i think thats what i read... if i'm wrong somebody please correct me.
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Old 07-09-2002, 12:29 AM
Doug Wilson Doug Wilson is offline
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You are right. The actual machined profiles are totally different.
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Old 07-09-2002, 12:37 AM
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Hydraulic cams are ground with a face angle to rotate the lifter, a hydraulic roller cam would not have this, it would have a face level to the cam centerline.
NO, you should not run that.
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Old 07-09-2002, 02:14 AM
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cool, thanx doug, i thought so...

its amazing what a 16 year old picks up when he's around motors and P.A.W catelogs all the time

that could be kinda bad though...i think my car has spent more time all over the garage (parts all over...) than on the road.... lotsa things wrong when we acquired it though...

I agree with Marc, i would not run the roller lifters unless the cam is a roller cam...
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Old 07-09-2002, 08:35 PM
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Quote:
That should read "specifically".
I see you caught yourself there.
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Old 07-10-2002, 12:03 AM
Doug Wilson Doug Wilson is offline
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Damn, Rumblefish, I was afraid you'd see that!
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Old 07-10-2002, 12:35 AM
Tarrbabe Tarrbabe is offline
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Question roller lifters?

Roller lifters on a standard cam would result in the roller only contacting the cam with only the edge. This would ruin the lifter in short order and most likely the cam also.
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Old 07-10-2002, 09:36 AM
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HUmm...let me think about this....No

*Note...you will make more HP with a solid lifter cam than a roller until you reach about 7200 RPM after that the heavier valve spring and friction reduction takes over and the roller wins.

Of course there's alot more to this theroy than one can post at 6:30AM and perhaps a seperate post would be a better place.

Doug...if you cominig to the big city I'll be around until Friday at 2PM...then it's off to the woods again for some fishin' and whiskey drinkin' with my Brother from Canada....it's my turn to buy lunch.....
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