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Re: Re: Re: Re: Re: Re: Re: SAE30 vs. Hytran Hydraulic Fluid
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Posted by Andy on April 22, 2003 at 10:09:13 from (12.2.73.37):
In Reply to: Re: Re: Re: Re: Re: Re: SAE30 vs. Hytran Hydraulic Fluid posted by Charles Norwood on April 21, 2003 at 19:01:12:
Charles, I, and the Society of Automotive Engineers (SAE) respectfully disgree with you. "The way oil viscosity is measured is with a Saybolt orifice viscometer, which is basically a cup surrounded by a water bath which keeps the temperature of the oil sample constant. There is a plugged opening in the bottom of the cup, which is opened when the oil is at the proper temperature. The oil is captured in a 60ml flask and the amount of time required to fill the flask is recorded. A SAE30 oil takes 58-70 seconds to fill the flask at 210F,
an SAE40 oil takes 70-85 seconds, and
an SAE50 oil takes 85-110 seconds.
There is also a test for low-temperature viscosity that is designated by a "W" suffix on the SAE viscosity rating.
A SAE5W oil takes less than 6000 seconds to fill the flask at 0F.
An SAE10W oil takes 6000-12000 seconds, and
an SAE20W takes 12000-48000 seconds."
Andy
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