Originally Posted by
Ruune
in this case, both aerodynamic and fluid dynamic laws apply here. Smooth surfaces have less drag coefficient, due in part to reduced turbulence generation and reduced exposed surface area. The only advantage that a less smooth surface could provide would be increased atomization. Due to the velocity of the air moving through the engine at operating speed, this is a moot point. The vaporization point of nitromethanol in a vacuum environment (carburetion) is typically below the operating temperature of these engines anyways. This will vary, based on lubricants and additives.
Lastly, from the point of entry (carb venturi) to the cylinder, the fuel/air mixture is under vacuum. That is unless you're running forced air induction (supercharger). So, the mixture is being pulled- not pushed.
Actually, the mixture is being pushed. Suction as we know know it is a bit of a fallacy, and purely a night time activity
When you "suck" liquid up a straw all you are doing is removing the air from within the straw and creating a vacuum. Gravity then pushes the liquid up the straw once the air is removed. In theory (and practice), if your straw was over 10 metres long the liquid would not flow any higher - no matter how hard you sucked on the straw. This is the maxium theoretical lift provided by gravity. Same applies in the motor. Once a vacuum is created in the crankcase - cylinder area, gravity pushes the air fuel mixture in to fill the void.
The rest of the flow theory and things I will leave up to you guys
