Can you explain the basics of how a car engine works to me?
user
Sure, that sounds like a great idea!  Basically there are several things happening when an engine is running, and I think the most important thing to understand is that it’s a complicated system made up of many different parts.  It might be hard to talk about this conceptually, since engines are so complicated, so maybe I can give you an example:  Imagine if you were trying to describe an animal in a way that makes sense to someone who has never seen one.  The most important thing to do would be to pick out the most important or useful details to tell your story, and let the other person interpret the information in his or her own way.  I can see that this approach might help to make understanding the different parts of the engine easier, right?
assistant
That makes sense.  So where do we start?
user
Alright, let’s think about some of the parts that an engine has.  There’s something called a piston that moves up and down.  There are also two types of valves, that we’ll call intake and exhaust valves.  These valves control the air that enters and exits the engine.
assistant
What makes the pistons move up and down?
user
There’s a piece of the engine that you can think of as the “heart of the engine”.  We call this the “crankshaft”.  The crankshaft is attached to the piston by a device called a “connecting rod”.  A cylinder, which is also called the “block”, has two holes, one for the intake valve and one for the exhaust valve.  At the center of the engine there is a device called the “camshaft”.  The camshaft is connected to the crankshaft by some gears, and this is what makes the crankshaft move up and down.
assistant
Can you explain the basics of how a car engine works to me?
user
Sure, that sounds like a great idea!  Basically there are several things happening when an engine is running, and I think the most important thing to understand is that it’s a complicated system made up of many different parts.  It might be hard to talk about this conceptually, since engines are so complicated, so maybe I can give you an example:  Imagine if you were trying to describe an animal in a way that makes sense to someone who has never seen one.  The most important thing to do would be to pick out the most important or useful details to tell your story, and let the other person interpret the information in his or her own way.  I can see that this approach might help to make understanding the different parts of the engine easier, right?
assistant
That makes sense.  So where do we start?
user
Alright, let’s think about some of the parts that an engine has.  There’s something called a piston that moves up and down.  There are also two types of valves, that we’ll call intake and exhaust valves.  These valves control the air that enters and exits the engine.
assistant
What makes the pistons move up and down?
user
When a piston moves up it’s called “going up”, and when it moves down it’s called “going down”.  There’s also “going back up” which is when the piston goes back up and then immediately comes back down again.
assistant
Can you explain the basics of how a car engine works to me?