Originally posted by jamesman
The reality is that space is a lack of air, hence total vacuum. pressure on earth is caused by the atmosphere acting like a balloon around the earth. Vacuum is truly the lack of Air. 100 % vacuum will be a condition where a chamber or vessel has a complete lack of all air within. Different planets with different masses and atmospheric densities will have a different atmospheric pressure than the earth's 14.5 psi or so. So, with regards to an engine, if the piston is at TDC then only the availiable volume will be filled with the 14.5 atmospheric PSI. As the piston moves down towards BDC, the 14.5 atmospheric PSI will rush into the cylinder to fill the increasing volume of the cylinder where the intake valves will eventually close. "suction" by standard terms is what you would feel if you were to place your hand over the intake ports while the piston is moving from TDC to BDC. Also, since the piston to cylinder wall contact is basically a seal, this actually helps draw in air more effectively than if it were to passively fill the chamber by just atmospheric pressure. There is a point where you can actually get more air in the cylinder than it can hold statically. This is due to the fact that the air going into the cylinder has a velocity and when the piston reaches BDC although the cylinder volume at this point does not increase, the momentum of the moving air will actually force a little more air into the cylinder. this would be the ideal time for the intake valves to close, and from my research, this is what high performance NA cars are after. this is also one reason why adjustable cam gears help to extract more power. okay, i'm done late james

Originally posted by jamesman
Also, since the piston to cylinder wall contact is basically a seal, this actually helps draw in air more effectively than if it were to passively fill the chamber by just atmospheric pressure.

Originally posted by jamesman
The reality is that space is a lack of air, hence total vacuum. pressure on earth is caused by the atmosphere acting like a balloon around the earth. Vacuum is truly the lack of Air

Originally posted by YourInMyMirror95GS
dick teaser's should be rounded up and shot in the forehead

Originally posted by etx
Good luck man! Project 'STFU Brian your talon is dead meat' should be on it's feet soon!

Originally posted by Dark0ne
Thanks. Now excuse me while i fuck your sister.

"fuck all motor" -turbo ate you