Hollow or solid cam?
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From: Little Rhody
Hollow or solid cam? Just picked up an aftermarket cam and it is solid, not hollow like the stock cam. Are all the aftermarket cams solid or is it by manufacturer?
Just curious
Just curious
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From: Little Rhody
They are drilled. I just spoke with Crane, they told me some cams are drilled, others are not. For street driven less aggressive grinds, no difference from a performance standpoint so they don't drill them.
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Gun drilled cams = less weight, specifically rotational weight, albeit a small difference. This makes for a faster reving engine and more hp - although the benefits are far too small to be perceptible at anyone, and likely wont even show up on a dyno.
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Verdad Gallardo Guitsboy, that is the thought that came to my mind, or maybe something to do with harmonics.
It is surprising they would go to the machining expense to drill them hollow. I definitely agree that the difference between drilled cam or not would be indistiguishable.
It is surprising they would go to the machining expense to drill them hollow. I definitely agree that the difference between drilled cam or not would be indistiguishable.
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From: Little Rhody
Originally Posted by GuitsBoy
Gun drilled cams = less weight, specifically rotational weight, albeit a small difference. This makes for a faster reving engine and more hp - although the benefits are far too small to be perceptible at anyone, and likely wont even show up on a dyno.
Does anyone know if the oil path has anything to do with it? I wouldn't think so, but figured I would throw it out there.
a drilled cam is lighter making it less weight. this makes the motor rev ever so slightly quicker. that's all it is. being a solid cam, makes it stronger also. less twist of the cam from front to back. again all about valve event timing for all cylinders. degreeing a cam for very cylinder, you won't see the discrepancy. because the cam is turning so slowly. at 7000 rpms, the shaft is twisting because the timing chain is turning the front of the cam. now, in microseconds, the rear of the cam is turning later. playing catch up per say. torsional stress is another way of looking at it. that's my viewpoint.
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From: Little Rhody
I went back into one of my LS1 books and found something on it, the statement made was that it was done for weight saving only. I computed the total weight of the removed material and got 1.86 lbs. I don't see anything that would lead me to believe that there is more to it than that, as the rotational mass moment of inertia between the two is likely in the noise.
I am wondering if it has anything to do with the hardening process? Does anyone know if they machine the cam then harden it or vice versa?
PS: I am happy with the cam, this just has me very curious.
I am wondering if it has anything to do with the hardening process? Does anyone know if they machine the cam then harden it or vice versa?
PS: I am happy with the cam, this just has me very curious.
J/K