Intake plenum and 911 throttle body

[Ben006]

I didn't read everything because I'm on my phone, but pulling air and pushing air is the same.
The engine does not pull air into it, the air is pushed inside because the atmospherique pressure is greater than the pressure inside the combustion chamber.

[jsceash]

Originally Posted by Ben006

I didn't read everything because I'm on my phone, but pulling air and pushing air is the same.
The engine does not pull air into it, the air is pushed inside because the atmospherique pressure is greater than the pressure inside the combustion chamber.

Exactly right, the same follow equations apply for compressed air pipe and vacuum pipe. The important thing is maintaining a constant surface cross section. The Tee even with an improved inlet radius can't do that. The turbulent area in the back of the tee is affected by flow velocity increasing in size. The higher the flow velocity the smaller the effective cross section.

[KRAM36]

Originally Posted by Ben006

I didn't read everything because I'm on my phone, but pulling air and pushing air is the same.
The engine does not pull air into it, the air is pushed inside because the atmospherique pressure is greater than the pressure inside the combustion chamber.

Yes, that's the principle of why air wants to "move into the engine", but the engine is working like a pump too. The downward stroke of the piston with the intake valve open creates a pull on the air into the cylinder. The rings on the piston are just as important to filling the cylinder with air as it is to the compression of the air.

[Jamesp]

Originally Posted by KRAM36

Yes, that's the principle of why air wants to "move into the engine", but the engine is working like a pump too. The downward stroke of the piston with the intake valve open creates a pull on the air into the cylinder. The rings on the piston are just as important to filling the cylinder with air as it is to the compression of the air.

So exactly how are air molecules joined together such that one can pull another? Little strings? High pressure pushing into low pressure is intuitively obvious, but low pressure "pulling" in high pressure? Puzzling.

[KRAM36]

Originally Posted by Jamesp

So exactly how are air molecules joined together such that one can pull another? Little strings? High pressure pushing into low pressure is intuitively obvious, but low pressure "pulling" in high pressure? Puzzling.

I don't know James. How is dirt pulled into your vacuum cleaner? Is each piece of dirt attached to each other with a little string such that one can pull another? Gravity is pulling the dirt down to the Earth, but the vacuum has enough force to pull the dirt off the ground. The force of the piston can not move air?

I'm not a scientist, maybe I shouldn't comment on anything since I'm not. I'm just trying to help out. All I know is the simulation of the air flow through the Distribution T is not like putting a leaf blower in the end of the Distribution T and blowing air at it. There seems to be a difference in what our engine is doing with the air and what the leaf blower is doing with the air.

Maybe you can clear this up? Is the simulation incorrect? Help out if you know, throwing jabs at me doesn't help anyone.

[jsceash]

Originally Posted by KRAM36

Yes, that's the principle of why air wants to "move into the engine", but the engine is working like a pump too. The downward stroke of the piston with the intake valve open creates a pull on the air into the cylinder. The rings on the piston are just as important to filling the cylinder with air as it is to the compression of the air.

The instant the air starts to move Newton's laws apply. It doesn't mater if it suck through a pipe or push through a pipe the same principles apply. The same equations are used to calculate flow loss, flow velocity.

This must be another theory that doesn't apply and can't be taught in Kansas school.