more oil

[DanMan1]

I was going to post this to the fuel/oil mix thread, but that one seemed like it was well done.

Not that I know crap about 2 strokes, but I had a thought with both remaining cells.

Regarding the leaning of the fuel/air ratio as the oil ratio is increased, caused by displacement of the gas volume with oil. I had one more possible contributor to this leaning effect.

Since the viscosity and surface tension of oil are far greater than that of gasoline, and since the gas/air ratio achieved by the carb is resultant from the effects of Bernoulli's principle, I think it is possible that a smaller quantity of heavy oil ladened fuel will be drawn in for a given carb air speed.

What do you 2 strokers think of that idea??

 

[spacemule]

I was going to post this to the fuel/oil mix thread, but that one seemed like it was well done.

Not that I know crap about 2 strokes, but I had a thought with both remaining cells.

Regarding the leaning of the fuel/air ratio as the oil ratio is increased, caused by displacement of the gas volume with oil. I had one more possible contributor to this leaning effect.

Since the viscosity and surface tension of oil are far greater than that of gasoline, and since the gas/air ratio achieved by the carb is resultant from the effects of Bernoulli's principle, I think it is possible that a smaller quantity of heavy oil ladened fuel will be drawn in for a given carb air speed.

What do you 2 strokers think of that idea??

I think the viscosity variation between 50:1 and 32:1 would be negligible.

 

[bwalker]

I thihnk that any oil ratio can be tuned to the proper air/fuel ratio. I alos think that the average joe could not tell the differance between a saw run at 50:1 and one ran at 32:1 with no changes made to the carb.

 

[DanMan1]

I was just thinking this may be partly responsible for having to open the needle valves a bit.. to compensate for the fuel not being drawn into the air stream quite as easily because of the surface tension that the oil gives to the gasoline.