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Originally Posted by vettestr
The talks circle back to the piston sucking fuel charge into the cylinder so here is a mind twister to kick around. If the piston is responsible for filling the cylinder what if we increase the size of the intake valve or have 2 or 4 valves per cylinder? If the bore diameter is 4 inch what if the the intake valve was 5 inch in diameter?
If the intake valve was not restricting flow or creating a pressure differential on each side of the valve when opened would the cylinder still get filled if the is no SUCTION? ( bore is 4 " and intake valve is 5 " and very high ramp angle)
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Yes. The air is only trying to balance a pressure differential. If there is no pressure differential the air is already in there or the air will move in without an increase in velocity. The increase in velocity is the specious suction you think about. The air moves in and out of the cylinder when the head is off as the piston is going up and down.
with the head on and the piston is at TDC there is very little room so very little air. When the piston drops it makes more room so the air has to move into the space to fill it to balance the pressure.The faster the piston drops the faster the air is trying to move into the cylinder.
Air is something. It has volume although you can't see it it is there. Unless your in Los Angeles then you can see it.
