JUST ANOTHER OIL (related) QUESTION.

Here's the oil temperature test platform.

A gasoline burning engine of 460 cubic inches.
Crankshaft oil clearances (main & rod) at .0015".
Engine speed at 3000 RPM during extended periods.
TOTAL GVCW of 15000 pounds. (GVCW = gross vehicle combined weight)
Oil type is synthetic.

The two test will be EXACTLY duplicated. (is that an oxy-moron?)

Here's my question(s).
Will a 5W20 oil produce a higher or lower oil temperature than a 15W50 oil of the same brand and type?
Does the heavy oil's temperature rise as it's squeezed through the "tight clearances"?
Does the heavy oil's temperature remain low due to it's weight or shear properties?
Does the heavy oil's temperature rise due to it's inability to flow as the light oil to dissipate heat from itself?
Could any or all of the above question's answers be inverted?

Just curious,
Dave.

My guess is the lighter oil will run cooler given the clearance's

Save those questions for the Winter Tech Seminar. We have Lake Speed Jr coming from Joe Gibbs Racing Oil, as a quest speaker.

Charlie

LivermoreDave wrote:Here's the oil temperature test platform.

A gasoline burning engine of 460 cubic inches.
Crankshaft oil clearances (main & rod) at .0015".
Engine speed at 3000 RPM during extended periods.
TOTAL GVCW of 15000 pounds. (GVCW = gross vehicle combined weight)
Oil type is synthetic.

The two test will be EXACTLY duplicated. (is that an oxy-moron?)

Here's my question(s).
Will a 5W20 oil produce a higher or lower oil temperature than a 15W50 oil of the same brand and type?
Does the heavy oil's temperature rise as it's squeezed through the "tight clearances"?
Does the heavy oil's temperature remain low due to it's weight or shear properties?
Does the heavy oil's temperature rise due to it's inability to flow as the light oil to dissipate heat from itself?
Could any or all of the above question's answers be inverted?

Just curious,
Dave.

Technically speaking, higher viscosity oils retain heat more than lower viscosity oils. That being said, given your particular engine example and intended usage I doubt you'd see much of a temperature difference on your vehicle's oil temp gauge.

Paul

It would all depend upon the ACTUAL temperature of the oil as different oils measure the same test viscosities at the testing given temperatures but, not near the same at temps above or below the viscosity grading temperatures.

Also, viscosity has nothing to do with a specific oil's ability to support a given hydrostatic load or not.