Tired of breaking camshafts

General engine tech -- Drag Racing to Circle Track

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pamotorman
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Re: Tired of breaking camshafts

Post by pamotorman »

MTENGINES wrote: Wed Feb 21, 2018 11:17 pm
pamotorman wrote: Wed Feb 21, 2018 1:46 pm
CamKing wrote: Wed Feb 21, 2018 11:59 am
They normally break before the #7 or #8 exhaust lobe, because that's about dead center of the widest gap between bearings.
On a sprint car engine, the rear of the cam is drilled and tapped to run the power steering pump. This adds to the problem.
The opening ramp on the lobe design, also adds to the issue, but it's not my place to critique someone else's designs.
do RO-7 blocks have the standard 5 cam bearings or do they have 7 like pro stock blocks ??
R07 has 6
Thanks if figured it had more than the std SBC to support the cam with all that RPMs
user-17438

Re: Tired of breaking camshafts

Post by user-17438 »

pamotorman wrote: Thu Feb 22, 2018 1:10 pm
MTENGINES wrote: Wed Feb 21, 2018 11:17 pm
pamotorman wrote: Wed Feb 21, 2018 1:46 pm
do RO-7 blocks have the standard 5 cam bearings or do they have 7 like pro stock blocks ??
R07 has 6
Thanks if figured it had more than the std SBC to support the cam with all that RPMs
It's also a 60mm cam. Hard to break a large core like that.
cgarb
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Re: Tired of breaking camshafts

Post by cgarb »

Do they still make non relieved cam cores? Saw one once in Bill Jenkins book. Thought it was cool looking, but must be expensive as all get out to have machined.
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