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November 29th, 2005, 02:43 AM   #11
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Re: oil cooling

Originally Posted by foxe
I think in an offroad bike that didn't see high speeds to keep the oil cool it would heat up real quick and stay hot and cook the motor.
Ed
I don't disagree with some of your points, but the DR800/BIG was used in the Paris/Dakar to good effect which is a tough, hot environment.

Suzuki still persist with oil cooling in the 600/1200 Bandit range and other ranges including new to market bikes.

I don't know, it just seems to me that a weakness of the 'big dirt bike based single' is low oil capacity and cooling. Doubling the oil capacity and using it to cool using oil coolers of the larger than average surface area that exists on the current berg range has some merit perhaps?
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November 29th, 2005, 07:22 AM   #12
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Re: oil cooling

Lets hope Husaberg doesn't revert to oil cooling. Oil is for lubrication and cooling of localized internal hot spots. It (the oil) then need cooled. The mass of heat is best removed the way it is i.e. water cooling. Every time I do 2 hard runs up Comp hill at Buttercup with my wifes lovely EX 400 Honda I have to let it cool off to ward off preignition.
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November 29th, 2005, 05:37 PM   #13
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Re: oil cooling

I had to do a quick search to find out about this suzuki you mention. Several observations. Prior to 1991 it is listed as air/oil cooled. I take this to mean that the cylinder had cooling fins to facilitate cooling and the oil was used only for the head and bottom end cooling. When oil cooling was mentioned in this thread it was the intent to replace water and rely solely on the oil to cool the motor (ala the GSXR). To convert to a DR800-type air/oil cooling system, you would have to remove the water jacket, add cooling fins to the cylinder liner, and seal the head/cam chain area (Don't laugh, at the shop I used to work at a guy that had a Suzuki Intruder wanted to do just that to make it look like a Harley-Davidson and he was real serious). I don't totally discount the idea of an air/oil cooled motor, in fact I believe that about 50% of the offroad riders would be perfectly happy with an air cooled, twin shock, conventional forked bike. But that is another topic for another thread.
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