Cylinder pressure during induction stroke?
Cylinder pressure during induction stroke?
(OP)
I am looking for cylinder pressure during induction stroke for an average NA engine? I am guessing that the vacuum is at its most when the piston reaches its maximum speed somewhere in the middle of the stroke.





RE: Cylinder pressure during induction stroke?
RE: Cylinder pressure during induction stroke?
For optimum performance, the inlet valve will be opened as soon as the inlet manifold pressure at the valve seat is higher than the exhaust manifold pressure at the valve seat.
This presupposes that the situation won't suddenly reverse and that the induction stroke is about to start.
The point varies greatly with engine speed.
Back to the OP
I don't know, but I think it will vary with manifold designs, rod length to stroke ratio, cam timing, engine speed.
I would GUESS it is around about maximum piston velocity
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RE: Cylinder pressure during induction stroke?
It really doesn't change much in this example (the near horizontal line at the bottom). I think Heywood has more detail.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Cylinder pressure during induction stroke?
RE: Cylinder pressure during induction stroke?
The question that i have, how much below atmospheric pressure does it go. This will surely answer my question, is an IC engine an efficient air pump?
RE: Cylinder pressure during induction stroke?