1. Battery
   Distributor
2. Cylinder head
   Carburetor

A car's battery looks sizable and impressive, but it often has only 24 volts, as we mention elsewhere in this quiz. The rest of the electricity that makes the engine work and provides all those enjoyable extras -- like the radio -- are amplified within the engine.

1. Crankcase
   Hub cap
2. Radiator cap
   Rocker arm

Of course, many engine parts are hot to the touch when the ignition's first shut off. But trying to take the cap off the radiator in an overheat situation is a way to give yourself a nasty steam burn.

1. Dipstick
   Fan belt
2. Oil pump
   Air filter

Sorry, dipstick, you're part of the lubrication system, but somewhat less than essential. It's the oil pump that gets engine oil where it needs to be, which keeps everything running well.

1. Alternator
   Cylinder
2. Radiator
   Carburetor

Alternators produce alternating current, which is converted to direct current by auxiliary parts. Alternators became increasingly important as cars gained a lot of electrical creature comforts, like heated seats.

1. Bearing
   Thermostat
2. Sump
   Turbine

"Turbocharging" takes its name from the use of the turbine to force gases back into the combustion chamber for extra compression. A supercharger works the same way, but is powered by the car's electrical system, to avoid turbo lag.

1. Crank pulley
   Fan belt
2. Timing belt
   Starter motor

Belts of various kinds have been essential to the workings of machines since, roughly, the first days of engineering. The fan belt runs the cooling fan in the engine, hence the name.

1. Dipstick
   Fan belt
2. Radiator cap
   Spark plug

The answer. of course, is "dipstick." There's a cruder version of this insult, but we can't say it here.

1. Coolant reservoir
   Fan belt
2. Fuse box
   Thermostat

A thermostat is a simple indicator, but an essential one. It allows you to pull over if your vehicle is overheating, rather than let the engine seize up.

1. Block
   Knob
2. Strut
   Tray

The engine block is where the magic happens! Or, at least, the essentials of combustion.

1. Bolt
   Cylinder
2. Piston
   Pump

A cylinder, in geometry, is a three-dimensional figure defined by two circles, one at each end. (Or you could just visualize a can). In the engine, it's where the fuel-air mixture is compressed and ignites.

1. Crankshaft
   Head gasket
2. Piston
   Spark plug

Many veteran mechanics have a story about breaking off a spark plug in the block. The best ones will also tell you the first step in dealing with it: Go have a cup of coffee or take a walk until you're not upset anymore and can approach the problem with a cool head.

1. Drafts
   Seals
2. Pistons
   Sumps

Fun fact: A skull and crossed pistons is the symbol of the Outlaws Motorcycle Club. They are the traditional rivals of the Hell's Angels.

1. Crankshaft
   Coil
2. Multi-accessory belt
   Timing belt

A chief engineering problem in making the earliest cars, trucks, etc, was getting power, or motion, to "change direction," so to speak. The crankshaft is an important part of that, transferring the energy generated by the combustion process -- or its initial motion -- to the power train.

1. Crankcase
   Cylinder head
2. CV joint
   Crank housing

This is a protective housing for the crankshaft and its connecting rods. It's also oddly fun to say aloud.

1. Camshaft
   Flywheel
2. Clutch
   Bushings

The full definition of a flywheel is a bit complex. But it "resists" and smooths out the intermittent energy produced by the constantly-moving pistons.

1. A bearing
   A flywheel
2. A poppet valve
   A fuel filter

A "poppet valve" was sometimes called a "puppet valve." Both terms come from the idea of the valve being controlled from above and making an up-and-down motion, like a puppet.

1. The coil
   The head gasket
2. The camshaft
   The dipstick

In general, a gasket is a seal. A head gasket keeps the cylinder from losing compression, which would make the engine lose power.

1. Catalytic converter
   Water pump
2. CV joint
   Starter motor

It isn't just vehicles that use catalytic converters. Found in fuel-burning stoves and heaters, they use a chemical reaction to convert harmful emissions to less harmful ones.

1. Air intake manifold
   Ignition coil
2. Mulitaccessory belt
   Starter motor

Your car battery doesn't actually have much more voltage than the one you'd put in a smoke alarm. The ignition coil increases it until it's capable of firing the spark plugs, which is essential to the combustion process.

1. Battery
   Hotwires
2. Magneto
   Timing belt

Magnetos aren't entirely gone; some airplanes still use them. (It's possible that engineers liked the cool, atomic-age name so much they couldn't let them go completely obsolete).

1. Fan belt
   Radiator
2. Manifold
   Strut plate

An intake manifold supplies the fuel/air mixture to the combustion cylinders. An exhaust manifold takes the exhaust gases from the combustion process and shunts them all into one pipe.

1. Camshaft
   Fan belt
2. Pistons
   Starter motor

The camshaft rotates pear-shaped plates, whose intermittent pressure causes the valves to open and close. This part of the engine is the source of all those commercials gloating over an engine's "double overhead cam."

1. Cylinder head
   Distributor
2. Multi-accessory belt
   Dipstick

The name is apt -- it distributes electricity. The reason the distributor has to do this in a particular order is because the cylinders must fire in a certain side-to-side order for balance. Otherwise, the engine would rock violently enough to shake the car.

1. Cylinder head
   Carburetor
2. Radiator
   Transaxle

This is a change from older flathead engines. In those, the valves were in the cylinder block.

1. Alternator
   Distributor
2. Multi-accessory belt
   Timing belt

A multi-accessory belt, as the name implies, replaced a system that used several belts to run engine parts like the water pump and the alternator. But the downside is, if this belt breaks, a lot goes wrong at once.

1. Distributor cap
   Crankcase
2. Ignition wires
   Starter motor

The advent of distributorless ignition might have been progress in terms of engine design. However, it ruined a good theft-protection and drunk-driving prevention strategy -- stealing the distributor cap.

1. Crankshaft
   CV joint
2. Rocker arm
   Transaxle

Unsurprisingly, the rocker arm is named for its characteristic motion. We would have liked for it to have been invented by Alice Cooper on his day off, but sadly, that's not so.

1. Alternator
   Rocker arm
2. Starter motor
   Timing belt

The starter motor is what comes to life when you crank the ignition. It powers the first two strokes of the four-stroke cycle, after which the process becomes self-perpetuating.

1. Bushing
   Glow plug
2. Rocker
   Solenoid

You might remember the solenoid from its use in the "War of the Worlds" remake. Tom Cruise's mechanically-inclined character suggests that replacing the solenoid in a car will correct the ignition failure caused by an electromagnetic pulse.

1. Camshaft
   Fan
2. Serpentine belt
   Solenoid

The fan, one of the simplest human investions for keeping cool, is still essential to the functioning of modern cars. Of course, if your serpentine belt includes the fan, it too can be credited with keeping things cool.

1. Oil filter
   Oil pan
2. Dipstick
   Crankcase

Of course, it's the oil filter. Keeping the engine oil free of gunk is critical to keeping the engine running well for years.

1. Clutch
   CV joint
2. Fuse box
   Solenoid

In the movie, "Road to Perdition," a boy is asked what the clutch does, and says, "it clutches." Well, not exactly. The clutch is several discs that connect and disconnect shafts, meaning it is the key connection between the engine and drive train. When you take your foot off the clutch pedal, you are actually "letting out" the clutch, not engaging it. Many people get this backward.

1. Crankshaft
   Camshaft
2. Dipstick
   Tappet

Strictly speaking, only overhead cam engines contain a part that could be called a tappet. In fact, a tappet is a fairly general term, meaning "an outcropping part that causes linear motion," However, it's associated enough with engines that car experts Tom and Ray Magliozzi called themselves, "Click and Clack, the Tappet Brothers."

1. Bushing
   Ball bearing
2. CV joint
   Wrist pin

The wrist pin doesn't just connect the piston and connecting rod. It also allows greater flexibility, letting the rod adapt to the motion of the piston without breaking.

1. Cylinder seal
   Fan
2. Propelling nozzle
   Rocker valve

A propelling nozzle is a part of a gas turbine. These are used in jet engines, which have turbofan engines.