Anyone tried this crank evac idea yet?

[mikew88gt]

Thanks guys. Just to clear up some questions for some. The venturi effect is generated by placing the tube or port into the moving exhaust stream. Even though you're thinking that the exhaust is at a greater pressure than the surrounding air by placing the tube into the exhaust stream causes a low pressure. Bernouli's principle is used for carbs and in making aircraft fly. It basically states that a mass of air will increase in pressure if it's velocity is decreased or it's pressure will decrease if the velocity is increased. The venturi in your carb sticks out in the air stream and causes the air to move around it at that point a little faster so that resulting low pressure is what pulls your fuel in.