Fuel Economy

[SpudRider]

Originally Posted by RedHawk47

Spud,
You are going to drive me crazy. In both of the photos the OCS is in the same position. Also, I don't think the loop in the tube makes a difference as long as it is not pinched off. I don't remember what thread the earlier photos were in...

There was nothing in the "campfire tube" and nothing has ever leaked from it.

Because of the weather since I got it in October I have only run two tanks of gas through it. Mileage are 63.9 and 61.6 MPG.

So, is my OCS correct or upside down?

Originally Posted by Jay In Milpitas

It's not so much about the hose, Dan (a lot of Dan's here) as it is about the orientation of the workings inside the OCS.

So far I have only had juice in my tube twice, and there was no difference in how I operated the bike.



I keep reading that second statement and something just doesn't seem to sound right.

I'm not trying to drive you crazy, Dan. Your OCS is in the incorrect position. I am not primarily concerned with the loop being pinched. The tall pinch in the loop is merely an easily recognized indication that the OCS is in the wrong position.

Jay and Detours are correct. It is the internal construction of the OCS which matters, not the pinch in the tube. The pinch in the tube merely indicates the OCS has been positioned upside down, and will cause the OCS to deposit more gasoline in the collection tube, instead of allowing more gas fumes to be drawn into the air box, and added to the fuel/air mixture.

As Jay stated, proper orientation of the OCS might not noticeably increase fuel mileage. However, it will allow more gasoline fumes to be consumed by combustion, rather than condensing the fumes as liquid fuel in the collection tube.

As Detours has shown in the following photograph, the screen inside the OCS is shaped like a cup.

http://www.chinariders.net/showthrea...el+tube&page=6



The photograph aboves shows the OCS in the upside down, or incorrect orientation. In this position the gas vapors drawn from the crankcase only pass through the side of the screen, since the top is open. This increases the velocity of the fuel vapors as they are drawn toward the air box. As the velocity of a fluid increases, pressure decreases, according to Bernoulli's Principle.

https://en.wikipedia.org/wiki/Bernoulli%27s_principle

Bernoulli's Principle predicts the air traveling over the top of an airfoil must move at a faster speed than the air moving under the air foil. Therefore, the top of the airfoil has lower air pressure, which generates lift.