Wet sleeve has the advantage of the shortest path for heat transfer from the cylinder to the liquid coolant. The down side is with the coolant in direct contact with the outside of the sleeve, you have the potential for coolant leaks at the seals where the sleeve/block/head meet, plus the chance of cavitation damage to the wet sleeve.
Dry sleeve has a longer path for heat transfer from dry sleeve to block to coolant, also takes precise fit of the block and sleeve exterior to get good sleeve to block contact for good heat transfer. The up side is that the potential for coolant leaks is much less than a wet sleeve.
Dry clutch is simple to build and up to the job in most cases.
Wet clutch has the advantage of running in oil to lubricate and cool it in severe use, so they are long lived under heavy use.
The down side is that a wet clutch makes it much more complicated to seal the clutch oil from leaking into the starter,engine and transmission, or leaking out of the clutch housing.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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