Posted by trucker40 on February 06, 2008 at 19:21:02 from (69.154.214.97):
In Reply to: Re: Enough posted by trucker40 on February 06, 2008 at 18:48:44:
I had to stop and think of how to say the rest.Every time the crankshaft turns one time the piston is up twice and down twice,so for the motor to fire all 4 pistons and turn the cam shaft one revolution,every piston will be up and down 4 times,the crank will turn 2 times.The cam opens and closes the valves,and it does it at the very best time in order to get a good load of fuel in and the exhaust out.So its air/gas mix in as piston goes down,intake valve open,piston comes up intake valve closed and fire,piston down back up again exhaust valve open.The cam has lumps on it to open the valves,a lifter rides on the cam lump and pushes a pushrod which pushes a rocker that opens the valve as the cam turns the valve spring pulls the valve back shut(if its not stuck)and closes it again.When both valves are closed on a cylinder(you know because your rockers are loose if adjusted right and pushrods are all the way down)thats the combustion stroke.The other stroke is exhaust.Thats a 4 stroke engine.There are 2 stroke engines,but yours isnt a 2 stroke. The cam allows the valve to open sooner or later and thats called timing.Also the distributer can adjust timing a little by changing when the spark plug fires like just a tiny fraction past or before top dead center of the compression stroke.
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