Thread: D-4S Thread
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Old 09-26-2011, 04:22 PM   #58
old greg
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Quote:
Originally Posted by serialk11r View Post
Then...dry sump? Is that a possibility?
Not at this sort of price point, and it wouldn't really reduce the amount of oil vapor in the crankcase anyway.

And on the topic of CG height, there is very little improvement to be had from a dry sump system on most engines. Production car engines have rather large diameter clutches and flywheels that limit the height of the engine once the oil pan is no longer the limiting factor. And on a flat engine you also have to consider the exhaust manifolds as well.

A dry sump is all about maintaining adequate oil pressure under sustained high g cornering. Lateral acceleration causes the oil in a wet sump to slosh to the side of the oil pan, potentially allowing the oil pickup to feed air to the oil pump (causing very bad things to happen to your crankshaft and rod bearings). This is especially an issue on a horizontally opposed engine, as oil will tend to pool in one of the cylinder heads during a turn. This will cause the level of oil in the sump to continually fall, making a loss of oil pressure more and more likely the longer you maintain a high-g turn. More than a few Subaru engines have been killed this way.
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