MOPED ARMY

Do the words "I measured" not have any significance?

yes the implication is that the larger the carb the longer the distance from the carb throat to the top of the fuel in the float bowl. But the example I gave was just for illustration purposes. Reality is often quite variable from our ideal illustrations. But the point remains that float level is important.

Dude your a genius!

And its not suction in the carbs that pulls the fuel thrue. When the air coming thrue the carb passes over the top of the atomizer it causes a vacuum that pulls the fuel up.

It’s called bernoulli's principle

Do you know why raising the fuel level increases fuel flow?

All?

No one else around here is copying and pasting basic knowledge from the internet to these forums but you.

Rocco,

1) there is a vacuum wave that travels along that path from the engine which pulls up fuel. It follows the same principle as when the exhaust port opens and a pressure wave is created which travels at the speed of sound. That wave is somewhat independent of the actual pocket of pressure which is the exhaust.

2) there is vacuum all along that path till the air filter

3) there is the Bernoulli effect on the jets

All three combine to pull up fuel through the jets but the farther the distance to the fuel, the less fuel is pulled up.

Guess again. Vacuum does not decrease because of distance inside of a tube.

Rocco didn't call you out I did!

There is a search function for rookies and some use it.

You seem to be one of the biggest rookies here M.F. and now a self proclaimed engineer too?

I love engineers. 99% classroom and book knowledge with 1% real world experience. Let me guess, you have an FA50 that goes 70mph too, right?

Ladies and gents I give you:

Michael forrests 2 stroke oil calculator

When is MA going to add a "hide topic" / block user function? Tired of seeing this doinks posts all the time.

Haha yea i have a difficult time understanding stuff like that. Gravity pulls it doesn’t push and the wall pushes back with the same amount of force.

I’m really wasn’t the best student

To prove that the suction pulling the gas up is due in only a very small amount to the Bernoulli effect, I want you to consider that effect only happens when there is a change in flow area so that under the front of the slide, when it is fully or partially closed, the area is smaller and so the flow is faster than before it and after it and so the Bernoulli effect creates vacuum there which acts mostly on the idle jet which is under the front of the slide. The needle and main jet are before this contracted area but still are at a slightly contracted area being under the middle of the slide. So the Bernoulli effect acts mostly on the idle jet and a little on the needle/main jets. Like I said before, there is some vacuum all the way between the engine and the air filter which acts on the jets, pulling up fuel from the float bowl which is at normal air pressure since the bowl is connected to outside air pressure via a breathing tube.

There is also a vacuum wave which some carbs make extra use of by the raised half shrouds extending up from the needle jet. They catch more of that wave and so the higher the shroud, the smaller the jets need to be.

The Bernoulli effect is everything! Without the Bernoulli effect a carb engine wouldn’t be able to consume it’s needed fuel. It’s the Bernoulli effect that makes it possible for the engine to “pull new fuel in”. Without each other they are nothing. The engine doesn’t “pull” fuel up thrue the float bowl, it “pulls” fresh air in thrue the carb, when this happens it cause a Bernoulli effect across the top of the atomizers, that effect then cause fuel to be “pulled thrue” the atomizer from the float bowl. The smaller the opening (smaller carb) cause the Bernoulli effect to be “stronger”. Try blowing across a top of a straw in some water with your mouth wide open vs just barly (like your whistling).

I know I probably used the worst choice of words. Sorry I’m surprised dirt Dillion didnt show up to call my dumb ass out

I love you ma sometimes! Your like a puppy that i haven’t decided To liked yet (edited)

Rocco, check out what the carburetor page of Wikipedia has to say;

"Bernoulli's principle, which is a function of the velocity of the fluid, is the dominant effect for large openings and large flow rates, but since fluid flow at small scales and low speeds (low Reynolds number) is dominated by viscosity, Bernoulli's principle is ineffective at idle or slow speeds and also in the very small carburetors of the smallest model engines. Small model engines have flow restrictions ahead of the jets to reduce the pressure enough to suck the fuel into the air flow. Similarly the idle and slow running jets of large carburetors are placed after the throttle valve where the pressure is reduced partly by viscous drag, rather than by Bernoulli's principle."

Wikipedia? Dude try mopedarmy! (edited)