One is thinner one is thicker. That don't take a rocket scientist to figure out? Simple physics. Ever try cramped hands on a oil bottle only to find out the harder you tried it fought back. Some oils react differant under pressure too.
equal amounts of vacuum through "cute little orifice?" Here is a nonchalant answer to loading that vacuum up. Represents a static load on the oil. IMO
If I went to school as a engineer? I am sure they would teach me this stuff
higher pressure causes the viscosity to increase....
Taken from here... http://www.engineersedge.com/lubrica..._viscosity.htm
I am not saying that is a only effect of course fuel has been oiled down.. I stand by viscosity being a contributing factor as well.. These both work hand in hand perfect. The outcome of said effect. Leaning out a mixture poteintally wrong.
Lets not forget stuff like altitude, Jet size, temp..... heck the list goes on.
Right about now I think it would be important to say. Consider manufacture's recomendations for their oil is most important advice for many a newbee in light of all the potiental confusion.
How about a fellow tuning his carb for the wrong oil ratio. I have done it. Takes a fellow awhile to figure it out but that gunks things up. If the oil flash point is right and fuel ratio optimal? That motor should stay clean!! Run baby Run