Definition of Spun
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Joined: Oct 2002
Posts: 2,351
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From: Winnetka, Calif, USA
Re: Definition of Spun (Supra)
It's pretty much what it sounds like. It normally refers to when you spin a bearing (rod or crank).
If you can get your hands on a bearing, you will notice that there is a small "tang" (I don't know of any other name for it) that when installed prevents the bearing shell from rotating.
In addition to the tang, there is a clamping force on the pair of bearing half shells that also prevents them from rotating within the block.
In a perfect world, the crankshaft doesn't really come in contact with the bearing surface, but floats on a thin film of oil. If oil pressure drops, then this film is lost and there is contact between the two. The resulting frictions welds the bearing to the crankshaft and then "spins" within the block. This is BAD news!
Wes Vann
If you can get your hands on a bearing, you will notice that there is a small "tang" (I don't know of any other name for it) that when installed prevents the bearing shell from rotating.
In addition to the tang, there is a clamping force on the pair of bearing half shells that also prevents them from rotating within the block.
In a perfect world, the crankshaft doesn't really come in contact with the bearing surface, but floats on a thin film of oil. If oil pressure drops, then this film is lost and there is contact between the two. The resulting frictions welds the bearing to the crankshaft and then "spins" within the block. This is BAD news!
Wes Vann
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