Link a chain through the hole, and wear it.

-Omi

EDIT: Yes Omi, It's cool enough for bling, but thats not what it does LOL

Tis metal.

EDIT: Metal it is, but it actually serves a very important function in the engine. The car won't run right without it

Edit by Shine: Hmm, does it regulate how fast the crankshaft rotates?

EDIT:No, it doesn't have anything to do with power, or drivetrain function

Is it the thing that goes around the piston?

EDIT: No, a piston ring is very thin. This part is very thick and heavy

Looks like a disc for the transmission.

EDIT: Nope. It is inside of the engine, and has nothing to do with the transmission

Something to do with the oil?

-Omi

EDIT: Yes, You are getting warmer Omi!

Elliptical gear.

-KIE

EDIT: Just looking at it, I would have guessed the same thing..... but no

Is it the starter ring gear?

-Omi

EDIT: Nope, it isn't a gear

So far, Volar/Omicron has guessed the closest. This part has something to do with the Oil in the engine. Guess its function, and you ROCK!

Can't believe I didn't get this from the start. It is the oil pump.

-Omi

Can't believe I didn't get this from the start. It is the oil pump.

 

-Omi

Omi is right. It may not look like a pump, but it resides behind the timing cover in my Olds engine. As the "gear" rotates, it creates suction that draws oil into the crankcase. If the teeth get marred at all, it doesn't rotate properly, therefore not creating sufficient oil pressure to feed the engine.

Congrats Omi, you recieve This Banner!