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Re: [Dry sumps]
On Fri, 11 Dec 1998 13:41:41 -0800 Steven Min <email@example.com> writes:
>I have a tech question for you all. I've heard of "Dry sumps" for oil
>my understanding is that the oil is not stored underneath the engine
>but somewhere else where the oil pump circulates it back to the engine
>negating the need for an oil pan. My Question is if my thinking is wrong
>no flames please :^) )or right, how does this work?
Basically you have a scavenge pump (at the block, removed all of the oil
from the engine) that flows oil to a reservoir which stores the oil. Then
from there most racing applications have a second pump that supplies the
oil to the engine.
The nice thing about this system is that it allows you to carry almost
any amount of oil that you would want. It allows for better cooling of
the oil. It also keeps the oil from being aerated as well as causing
parasitic drag on the crankshaft.
A quick example and if you can recall the (now) old infomercials for I
think slick 50? Something like that, doesnt matter.) They ran an engine
on a dyno. Then they removed the oil plug and ran another test without
oil and it netted, without any oil, 14hp more power. Im sure some of the
HP gain was the oil pump not pumping any oil but some of that HP gain was
from the crankshaft and other rotating parts not splashing in the oil.
> and why don't all cars use this system?
Cost. Maintenance issues. The only car that I do know that uses a factory
dry sump system is the Porsche 911. (maybe more, im not sure.) The oil
pan system works, is cheap to produce and lasts a long time. That im sure
is a good part of it. You only usually see the dry sump systems in
performance oriented cars.
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- From: Steven Min <email@example.com>