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Old January 30th, 2013, 02:29 PM   #21
fsumotorhead
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Originally Posted by brewmenn View Post
In a pushrod engine the lobes on the cam shaft (which rotates at half the speed of the crankshaft) push on the lifters, which push on the pushrods, which push on the rocker arms, which push the intake and exhaust valves open. The valve springs resists the opening and return the valve closed when not bring pushed open. This is what you're Jeep engine is like.

In an overhead cam engine there is no pushrod. One end of the rocker arm follows the lobes on the camshaft and the other end pushes on the valve, opening them. Once again the spring is there to push them back closed. More modern engines are often like this.
only on a four stroke

...just being picky
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Old January 30th, 2013, 03:02 PM   #22
brewmenn
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Originally Posted by fsumotorhead View Post
only on a four stroke

...just being picky
Yes. What I said was true for most 4 stroke gasoline internal combustion piston engines, which is what is in most vehicles on the road, including most Jeeps.

I'm sure someone will find exceptions.
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Old January 30th, 2013, 03:52 PM   #23
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Originally Posted by Catnip 0_o View Post
Now that just confused me, I never seen anything like that before
ahhh. rotary engines. gotta love em. I wont try and explain it... here's a decent explanation....

http://auto.howstuffworks.com/rotary-engine1.htm

and in action...
http://www.animatedengines.com/wankel.html
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