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Roller bearing vs std bearing cam RB/hemi?
#987381
05/06/11 10:31 PM
05/06/11 10:31 PM
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Joined: Jun 2009
Posts: 1,212
QLD Australia
Keith Black®
OP
pro stock
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OP
pro stock
Joined: Jun 2009
Posts: 1,212
QLD Australia
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Looking to understand the benefits of a roller-bearing large journal cam over std journal bearing-type cam when the specs would otherwise be identical. Assume in this instance a solid roller cam circa .700 lift @ the valve. Durability? Performance improvements? I understand you would use larger journal cam where the lift/base-cricle combo is large enough that you otherwise wouldn't get the cam into the block.. but what other benefits have you had? I can order my new KB block this way. durability important. Does it effect valve train oiling? 
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Darren Beale
Keith Black Racing Engines®
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: Keith Black®]
#987384
05/06/11 10:52 PM
05/06/11 10:52 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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Quote:
Looking to understand the benefits of a roller-bearing large journal cam over std journal bearing-type cam when the specs would otherwise be identical.
Assume in this instance a solid roller cam circa .700 lift @ the valve.
Durability? Performance improvements?
I understand you would use larger journal cam where the lift/base-cricle combo is large enough that you otherwise wouldn't get the cam into the block.. but what other benefits have you had?
I can order my new KB block this way. durability important.
Does it effect valve train oiling?
With a roller bearing set up you will have a much
larger cam all the way through... big means strong
so you have less flex specially with big roller springs
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: Diablo]
#987386
05/07/11 12:12 AM
05/07/11 12:12 AM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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On some engines I build I use big cores but still use regular bearings. Roller bearings do some strange things. .700 lift? Thats mild, my wedge has .850 at the valve with 1.7 rockers and billet steel round lobe regular size core, i take it to 8200. The ford size is a good step up and still reasonable to get a cam ground. Jesel makes 60mm regular coated bearings if you feel the need to go that big. i just happen to have a pic of a set with the part number:  Gear drive and roller bearings? I would pass on that combo. If you never built a roller bearing engine make sure you have help from someone that does because you have to tailor your oiling around it. If you do decide to use a big core make sure you get it rifle drilled cause its Heavy!!!!
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: bigtimeauto]
#987388
05/07/11 12:39 AM
05/07/11 12:39 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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Quote:
On some engines I build I use big cores but still use regular bearings. Roller bearings do some strange things. .700 lift? Thats mild, my wedge has .850 at the valve with 1.7 rockers and billet steel round lobe regular size core, i take it to 8200. The ford size is a good step up and still reasonable to get a cam ground.
Jesel makes 60mm regular coated bearings if you feel the need to go that big. i just happen to have a pic of a set with the part number:
Gear drive and roller bearings? I would pass on that combo.
If you never built a roller bearing engine make sure you have help from someone that does because you have to tailor your oiling around it. If you do decide to use a big core make sure you get it rifle drilled cause its Heavy!!!!
Wow.... I run a 50 MM cam at .700+ lift with a gear
drive on my SB
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: Keith Black®]
#987390
05/07/11 12:59 AM
05/07/11 12:59 AM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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I don't think longevity is going to come from roller cam bearings. You get more harmonics and more pieces to fail inside your engine.
Another thing i forgot. If you go with a bigger core and use pushrod oiling MAKE sure you check where your lifter band hole is in relation to your lifter oil galley!!!
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: Keith Black®]
#987393
05/07/11 02:52 AM
05/07/11 02:52 AM
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Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin
super stock
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super stock
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
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On my new KB bock I went for the 54mm cam core using std bearings which is a no charge up grade. I am confident it will work fine... The bigger cam core is stronger for less deflection! Roller bearings have their place, but it is not really a reliability thing, it is more to withstand severe loading from big cams and huge spring pressure IMO... Good luck with the build. Arnie
67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...)
70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
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Re: Roller bearing vs std bearing cam RB/hemi?
[Re: tubtar]
#987395
05/07/11 04:04 PM
05/07/11 04:04 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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correct on the oiling. There is no hole in the bearing so they get all of there oil from splash. Not a great idea for longevity especially at low rpm.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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) & thanks will check out the Ford core options. 
