If you're mechanical oriented, being a mechanic is fun indeed. Obviously, if you're worried about the grease on your hands, and knuckle busters, then perhaps you're not the right man for the job.
I got into mechanics when I was 13. No, not cars.. but lawnmowers.

Car engines don't interest me that much. Well, new ones at least. The funnest car engine I ever worked on was a '56 VW bug engine.
Small Engines(lawnmower) are a good place to start if you're looking to get into mechanics, all the basic principals are the same. I still adore them, and I collect antique small engines. My oldest is a 1920s Briggs and Stratton model WM(stands for Washing Machine), 3/4 horsepower.
Was made before electricity was widespread.. You had to wash your clothes somehow.

It doesen't even have an air cleaner. As in, It wasn't built with one. It's a kick start, and it starts on the first kick- after you've turned it over a few times to get the gas up the line. All cast iron construction, besides piston and rod. The damn thing weighs like 50lbs.
My favorite is a 1954 Briggs model 5S. Rope pull, 1 1/2 horsepower. Cast iron crankcase, aluminum head and rod/piston. Awesome oil-bath aircleaner. I just recently rebuilt it(Do you have any idea how hard it is to find .010 OD 2" rings for antique engines?!?), and it starts on the first pull every time, nomatter how cold it is outside. It even started right up after sitting for 2 years.
I also have some old unknown horsepower, unknown brand Generator engine from presumably the 30s or early 40s. It resembles a Wisconsin engine. It's big, at least 8horse. It was a 600Watt generator, but the brushes housings were made out of aluminum, and when we started it, they crumbled away.

I need to find some machine shop that can make some new ones. The engine is good though, appears to be used very little. All cast-iron construction, it weighs nearly 100lbs.
Damn, I love old engines.
It is true, you know.. they sure don't build things like they used to. You will never see an 80 year old current Briggs engine. They're built to last 3-5 years. I think it's sad.
Those old cast iron engines are nearly impossible to kill. You can run them without oil for hours, and hours, and hours. Ever seen a glowing red engine running? I have.

It ran for several hours with no cooling and no oil before it finally threw a rod. You couldn't run a newer engine without oil for 10 minutes without causing severe damage, and possibly lockup. Heh.
Did I mention I love old engines?
