Really liked this video on a Spintron. The end of the video may have the oil answer.Spintron!
Really liked this video on a Spintron. The end of the video may have the oil answer.Spintron!
Too many factors and it would be too difficult to hold all factors constant that effect oil temperature.How, and how does the temp equate to real world numbers?
There is ... just use what CAFE has told you to use. There have been studies that try to equate an increase in fuel economy from thinner oils, so that's a way to tell how much friction reduction there is. Also studies that just look at the frictional forces involved between moving parts. Start Googling ...Neither. I am just curious to know if there's a way to quantify the amount of drag reduction in an engine by reducing the viscosity or the HT/HS.
Butt dyno.We're running thinner oils to reduce drag and increase mileage. Is there some way to measure and understand how much drag is reduced when going to thinner oil? I'm most interested in what happens when going from an HT/HS of 3.5 to something around 3.0, or from a Kinematic Viscosity @ 100 C of 12 to one of 10 or so.
Yes?I'm a bit confused. Is the point of this post to save gas, or reduce wear on the engine?.,,,
why not just compare bsfc with both oils?That's not easy to measure directly.
One approach to estimate it using a dynamometer:
1) Measure fuel flow rate to maintain a specific speed and torque load with test oil #1.
2) Under otherwise identical conditions, including speed, adjust load to yield the same fuel flow rate with test oil #2.
The difference in measured output torque theoretically would equal the difference in drag torque.
Test would have to be repeated a few times to reach a statistically valid conclusion, so it's not a cheap experiment.
You can, under any conditions you like. The difference in BSFC might be due to the drag torque difference, but wouldn't tell you specifically what it is.why not just compare bsfc with both oils?
shouldn't it be linear?You can, under any conditions you like. The difference in BSFC might be due to the drag torque difference, but wouldn't tell you specifically what it is.
And both engines will still get lousy gas mileage in slow speed urban traffic. Not enough difference for anyone but the EPA to notice.Run engines in a closed environment with a prescribed amount of fuel.
A possible example?
A Toyota engine under test load using 0W16 goes 36 minutes and 25 seconds while the same engine on 0W20 goes 36 minutes and 5 seconds on the same amount of fuel.
Weekly 'toilet thoughts' threadI'm a bit confused. Is the point of this post to save gas, or reduce wear on the engine?.,,,
Spintron!
I'm sure .5 reduction of ht/hs would be significant if a test could be very precise and repeatable. I'll be darned if I know what that is. Although I think it is a legitimate question, Google is your friend.We're running thinner oils to reduce drag and increase mileage. Is there some way to measure and understand how much drag is reduced when going to thinner oil? I'm most interested in what happens when going from an HT/HS of 3.5 to something around 3.0, or from a Kinematic Viscosity @ 100 C of 12 to one of 10 or so.