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Old 02-26-2012, 01:23 PM   #21
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Join Date: Oct 2009
Location: Massachusetts
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Originally Posted by bigjae1976 View Post
IIRC, the guy said (I think) it floods the engine and something bad happens (can't remember what).

The S54 is a dry sump? Didn't know that.
Well, it is a Semi-Dry Sump system. In a true dry sump there is an external resevoir and hoses leading to it with the pumps in the reservoir. What BMW did with the S54 is take the dry sump and instead of locating it externally, they developed it into the bottom of the engine. In a wet-sump the oil is "picked-up". This is why in high-speed corners Non-M's have oil starvation because the oil goes to one side and the pump can't pick up oil, only air. In a dry sump the oil drain down into the pump and consequentely you don't get oil starvation unless if of course you flipped the car . So basically they took a dry sump and mounted it to the bottom of the engine instead of mounting it externally. The advantages a true dry sump would give you would be more oil in the system and better cooling and no "frothing" of the oil.
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