What is Dry Sump?

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2 total messages Started by unitedtowingjc@y Tue, 08 Jul 2003 19:03

#99994

Author: unitedtowingjc@y
Date: Tue, 08 Jul 2003 19:03

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While looking at a few bikes on my quest for a new machine...i have
noticed a few have Dry Sumps.... Yamahas, Suzuki DRZ etc.

What is the benefit or downfall of this?

Does it help the longevity of the motor?
Why do they do it?

Thanks.

Re: What is Dry Sump?

#99996

Author: Chris Buckley
Date: Wed, 09 Jul 2003 02:28

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Dry hump is when a guy and girl rub up against each other with their
clothes on.

A Dry sump engine uses two oil pumps, one to feed oil to the engine
bearings, and another pump to "scavenge" the oil from the bottom of the
crankcase, and return it to the oil tank. There are several reasons for
doing this, one is to reduce loading on the crankshaft. If the crank
shaft runs in a bath of oil, horsepower is lost, other reasons for
getting the oil out of the sump are foaming and cooling. There's no
disadvantages to dry sup engine designs, other than adding additional
cost and weight to a bike.
Chris

Slingblade wrote:
>
> While looking at a few bikes on my quest for a new machine...i have
> noticed a few have Dry Sumps.... Yamahas, Suzuki DRZ etc.
>
> What is the benefit or downfall of this?
>
> Does it help the longevity of the motor?
> Why do they do it?
>
> Thanks.

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