What happens during the intake stroke of a four-stroke internal combustion engine?

A. The piston moves downward, creating a partial vacuum that draws in air and fuel.
B. The piston moves upward, compressing the air/fuel mixture and raising its temperature.
C. The piston moves upward, doing work on the air/fuel mixture to push it out of the cylinder.
D. The piston moves downward as a result of the air/fuel mixture doing work on it.

Question

What happens during the intake stroke of a four-stroke internal combustion engine?

 		A.	The piston moves downward, creating a partial vacuum that draws in air and fuel.
 		B.	The piston moves upward, compressing the air/fuel mixture and raising its temperature.
 		C.	The piston moves upward, doing work on the air/fuel mixture to push it out of the cylinder.
 		D.	The piston moves downward as a result of the air/fuel mixture doing work on it.

vera_ewing · Answer

@sweetburger A is correct?

sweetburger · Answer

tbh i dont know anything about engines :/

vera_ewing · Answer

Oh ok...can you message aaronq and see if he can help?

sweetburger · Answer

I will. I am also googling and I think i may have found the answer just one second.

sweetburger · Answer

I believe it would be A. as the piston creates a partial vacuum through increasing the volume and then forces air and fuel inside.

vera_ewing · Answer

Thanks!