what prevents the exhaust gases from going out through the INLET VALVE during the valve overlap period.
2007-03-10 14:39:16 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
There is very little volume left in cylinder at that point, so the cylinder is quite ready for intake opening for downward piston travel.
2007-03-10 16:11:48 · answer #1 · answered by done wrenching 7 · 0⤊ 0⤋
As the piston comes up during the compression stroke, both the intake and exhaust valves are closed. The fuel tries to escape, but can't go anywhere, as long as your rings and valves are in good shape. Both valves remain closed as the ignited fuel drives the piston down during the power stroke. As the piston comes back up during the exhaust stroke, the exhaust valve(s) is/are open and the exhaust follows that path out of the cylinder.
2007-03-10 22:54:46 · answer #2 · answered by Who Am I 4 · 0⤊ 0⤋
the overlap between the valves is on the exhaust - intake cycle not the other way around.
2007-03-10 22:53:27 · answer #3 · answered by al u 1 · 0⤊ 0⤋
both valves close, piston coming up on compression stroke, spark, ignition, piston forced down due to rapid expansion of ignited air/gas mixture, piston goes up with exhaust valve open expelling burnt gas, piston goes back down with intake valve open & exhaust valve close thus sucking in air/gas mixture, both valves close piton going up on compression stroke, on & on & on
2007-03-10 22:48:24 · answer #4 · answered by gejandsons 5 · 0⤊ 0⤋
It actual does. A little tiny bit. That's why there is buildup on intake valves.
2007-03-10 22:44:41 · answer #5 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
Well go to this URL and it explains everything complete with a moving picture to see.
http://en.wikipedia.org/wiki/Four-stroke_cycle
2007-03-10 22:47:53 · answer #6 · answered by Big C 6 · 0⤊ 0⤋