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Old January 29th, 2013, 03:46 PM   #1
Catnip 0_o
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Default How an engine operates - In detail

Ever since I got my TJ I have become fascinated with cars in general and how they work. I wish I would have taken a automotive class in high school but back then I wasn't interested in cars at all. Now that I have my TJ not only do I enjoy working on it myself, I like learning about it and how everything works. I took a automotive class in college to get a little bit better of an understanding and plan to take many more but for now I am looking for some education on my own and hopefully you guys can help me out.

If you guys/gals have any good writeups with pictures/video or any other info I would gladly appreciate it. I tres googling how an engine works in general and it just gave me a bunch of crappy links to EHow and such. Not only do I want to know how it works but what it is made up of and how the internal parts work together: camshaft, lifters, rocker arms, push rods, valves, crank, ect.

Thank you
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Old January 29th, 2013, 05:29 PM   #2
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buy a really cheap motor that has every thing dosent really matter on the motor as long as it has every thing.
tear it apart and figure out how every thing works
when your done learning scrap it
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Old January 29th, 2013, 05:38 PM   #3
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You don't ask for much do you.

Start with those crappy "how things work" sites and come back here for more specific info on what you didn't understand or want more information about.
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Old January 29th, 2013, 05:48 PM   #4
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you tube that shit
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Old January 29th, 2013, 06:46 PM   #5
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You don't ask for much do you.

Start with those crappy "how things work" sites and come back here for more specific info on what you didn't understand or want more information about.
Well I guess I will try to be more specific, I might sound like an idiot on some of the things but I'm trying to learn here.

First off, from my knowledge the lifters are connected to the push rods, push rods to the rocker arms, rocker arms to the valve springs, and valve springs to the intake/exhaust valves. However, I am unsure what connects to the lifter and how it goes up and down and how this process works.

Also I found some information online that showed a photo of a camshaft turning like a crankshaft, except when it turned its "lobes" (I believe thats what they were called) rotate and press up on the intake valves and then rotates the exhaust valves. But I thought the rocker arm and valve spring were for this? As you can see I am alittle confused somewhere
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Old January 29th, 2013, 06:55 PM   #6
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Originally Posted by muddinman56 View Post
buy a really cheap motor that has every thing dosent really matter on the motor as long as it has every thing.
tear it apart and figure out how every thing works
when your done learning scrap it
This... It's a great way to learn and understand how it works. If you're anywhere near me I have one you can have. It's even a jeep inline 6!

Edit: I would even be willing to have a beer and explain anything you wanted
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Old January 29th, 2013, 07:12 PM   #7
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Might be able to find some decent old textbooks @ a public library.

There are books like this:

http://www.amazon.com/How-Cars-Work-...w+engines+work

Try to learn the super basics, then do your search on more details topics.

These don't seem to get as good of reviews due to some production changes, but one of these would help you understand a basic pushrod V8..

http://www.amazon.com/Revell-Visible...odel+v8+engine
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Old January 29th, 2013, 07:15 PM   #8
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Plenty of stuff on youtube also. new and classic. SOmetimes these old films are better, to understand the old tech a lot of us use..


Once you get all the basics down, there are various racing type books out there that help you understand more advanced topics, like cylinder head flow, or rod/stroke ratios, things like that.
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Old January 29th, 2013, 09:41 PM   #9
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Originally Posted by Catnip 0_o View Post
Well I guess I will try to be more specific, I might sound like an idiot on some of the things but I'm trying to learn here.

First off, from my knowledge the lifters are connected to the push rods, push rods to the rocker arms, rocker arms to the valve springs, and valve springs to the intake/exhaust valves. However, I am unsure what connects to the lifter and how it goes up and down and how this process works.

Also I found some information online that showed a photo of a camshaft turning like a crankshaft, except when it turned its "lobes" (I believe thats what they were called) rotate and press up on the intake valves and then rotates the exhaust valves. But I thought the rocker arm and valve spring were for this? As you can see I am alittle confused somewhere
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.
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Old January 30th, 2013, 08:52 AM   #10
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Originally Posted by 99_2door View Post
This... It's a great way to learn and understand how it works. If you're anywhere near me I have one you can have. It's even a jeep inline 6!

Edit: I would even be willing to have a beer and explain anything you wanted
To bad you are so far away I was totally about to take you up on that offer ( but thank you for the kind offer

Maybe I'll do some looking around for a scrapped inline 6, any idea how much one would cost if anything?
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Old January 30th, 2013, 08:55 AM   #11
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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.
So just out of curiosity, in a pushrod engine (inline 6) the cam wouldn't be noticeable if I were to remove the valve cover because It is inside the block under the lifters?
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Old January 30th, 2013, 08:58 AM   #12
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http://www.revell.com/model-kits/engines/85-8883.html

I built one of these when I was a kid.
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Old January 30th, 2013, 09:00 AM   #13
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So just out of curiosity, in a pushrod engine (inline 6) the cam wouldn't be noticeable if I were to remove the valve cover because It is inside the block under the lifters?
Yes. On a pushrod engine the cam is in the block. I'm not sure if you would even be able to see it from the top.

On an overhead cam engine you'd be looking right at it when you removed the valve cover.
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Old January 30th, 2013, 11:27 AM   #14
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Originally Posted by Haggar View Post
Plenty of stuff on youtube also. new and classic. SOmetimes these old films are better, to understand the old tech a lot of us use..

How The Motor Car Works - The Engine (Part 1 of 2) - YouTube

Once you get all the basics down, there are various racing type books out there that help you understand more advanced topics, like cylinder head flow, or rod/stroke ratios, things like that.
Very old but excellent video, you know you like cars when you find that interesting!
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Old January 30th, 2013, 11:30 AM   #15
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http://www.revell.com/model-kits/engines/85-8883.html

I built one of these when I was a kid.
dang thats awesome, I have a hobby store that is close by I'm pretty sure they have those model engines there, I'll see if I can pick one up
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Old January 30th, 2013, 11:34 AM   #16
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dang thats awesome, I have a hobby store that is close by I'm pretty sure they have those model engines there, I'll see if I can pick one up
send pics of the build up!
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Old January 30th, 2013, 11:38 AM   #17
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http://www.revell.com/model-kits/engines/85-8883.html

I built one of these when I was a kid.
i did too! great learning experience.
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Old January 30th, 2013, 12:26 PM   #18
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send pics of the build up!
Ha I should, once I get a day off I'll do some looking around
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Old January 30th, 2013, 01:05 PM   #19
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YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.

Don't listen to these guys, this is how the MODERN motor works in your jeep.
http://youtu.be/6BCgl2uumlI
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Old January 30th, 2013, 02:59 PM   #20
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YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.

Don't listen to these guys, this is how the MODERN motor works in your jeep.
http://youtu.be/6BCgl2uumlI
Now that just confused me, I never seen anything like that before
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