Bearings
10-17-2002, 05:05 PM
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Re: Bearings (GZERO)
Well. Cams dont have bearings.
Crank and rod bearings are about as hard as you can get steel. Their hardness against the crank (also hard as a damn rock...probably carburized) keeps them from wearing each other. Of course they generate heat and require removal of the heat (oil), but they also use the oil as a fluid "bearing" between them.
Think of the gears in your tranny. Theyre metal to metal as well. They use the oil to cool and prevent scoring.
The best I can describe it is theres a thin layer of oil between them that cannot be compressed (principle behind hydraulics).
Crank and rod bearings are about as hard as you can get steel. Their hardness against the crank (also hard as a damn rock...probably carburized) keeps them from wearing each other. Of course they generate heat and require removal of the heat (oil), but they also use the oil as a fluid "bearing" between them.
Think of the gears in your tranny. Theyre metal to metal as well. They use the oil to cool and prevent scoring.
The best I can describe it is theres a thin layer of oil between them that cannot be compressed (principle behind hydraulics).
10-17-2002, 08:03 PM
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Re: Bearings (niedejb)
ok, but why not use roller bearings like turbos for example? i think bearings are one of the best discoveries of the century, but i still can figure out how they really work? i understaned what you said, but still, if is that hard why doesn't the rod or crank worn out at a faster rate?
10-18-2002, 05:01 AM
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Re: Bearings (GZERO)
I believe the molecules of oil roll around like bearings. This is why it is slippery, because it's like a bunch of ball bearings. The very hard surfaces of the crank and rod ride on the oil, not on each other...
10-18-2002, 11:33 AM
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Re: Bearings (GZERO)
ok, but why not use roller bearings like turbos for example? i think bearings are one of the best discoveries of the century, but i still can figure out how they really work? i understaned what you said, but still, if is that hard why doesn't the rod or crank worn out at a faster rate?
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10-18-2002, 11:57 AM
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Re: Bearings (SOHCArchangel)
Plus imgine the stress the ball/rollers would have to withstand. If one ball or roller would get scored or dented the whole assembly would fail.
10-18-2002, 01:08 PM
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Re: Bearings (schlit)
The journals in the top of the head hold the cam. Just aluminum grooves that the cam rides in.
The crank and rod bearings have holes and recesses that line up with holes in the crank.
The crank and rod bearings have holes and recesses that line up with holes in the crank.
10-18-2002, 01:10 PM
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Re: Bearings (Stew Pidasso)
Plus imgine the stress the ball/rollers would have to withstand. If one ball or roller would get scored or dented the whole assembly would fail.
10-18-2002, 01:20 PM
#11
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Re: Bearings (SOHCArchangel)
plus man smokey eunich once built a roller bearing motor
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