Under the Hood

The Under the Hood Channel explores the systems that make your car function correctly. Learn about car parts and systems and how to do routine maintenance.

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Internal combustion engines aren't going away anytime soon. And since a practical alternative can't be ready for use within the next few years, we need a better internal combustion engine in the meantime.

By Christopher Lampton

Your car's engine always leaves behind some portion of unburned fuel. Good thing the secondary air injection system is there to help clean up the leftovers. But is it really necessary?

By Cherise Threewitt

Four strokes, less fuel. How's that sound? With the addition of just a couple of linkages, an Atkinson cycle engine can complete all four strokes with a single rotation of the crankshaft.

By Kristen Hall-Geisler

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The Grail Engine takes a variety of modern, cutting-edge engine technologies and puts them all together in one package. Honda and Ford have already shown interest -- should the rest of us?

By Patrick E. George

Ever since inventors have tried to get cars moving, they've tinkered with the possibility of alternative fuel systems. What does an HHO system have to do with water, and does it actually work?

By Eric Baxter

Whether it makes your car sound like a swarm of angry bees or the deep rumble of an earthquake, your car's exhaust system is doing its job every time you turn the key.

By Cherise Threewitt

If you're buying a new car, you know air conditioning is almost certainly a standard feature. But it wasn't long ago when AC was an expensive option. Find out how this now nearly universal feature works.

By Kristen Hall-Geisler

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As if the price of gasoline isn't bad enough: Did you know that the fuel in your car's gas tank is slowly evaporating away? Even when parked?

By Patrick E. George

Researchers in Japan have developed a new method of auto theft deterrent that verifies the driver's identity. Are you comfortable with your car seat knowing this much about you?

By Cherise Threewitt

We can already use biological markers to identify people, but within the next decade, similar technology is coming to our cars, too. Will this be yet another distraction for drivers?

By Kristen Hall-Geisler

Carbon fiber is one of the lightest and strongest materials used in auto manufacturing; however, it's expensive and time consuming to produce. Has it already been replaced by something better?

By Patrick E. George

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Unleaded, high octane, supreme: We'll show you which gas your car really needs and how easy it is to figure out.

By Chris Warren

It's no secret that technology changes fast -- and the auto industry is no exception. So what's in store for future cars?

By Christopher Neiger

Horsepower and torque are closely related -- but what sets them apart?

By Eric Baxter

Did you know that there is more than one way to control car emissions? One type is the 4-2-1exhaust system.

By Eric Baxter

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Some of the latest gasoline engines to hit the market are super-efficient, thanks to their engineers playing with a little thing called compression ratio.

By Jamie Page Deaton

Whether it's a tiny city car with a direct-injected engine or a supercar with a "push to pass" hybrid booster button, these technologies promise that the future of driving will still be fun.

By Kristen Hall-Geisler

There are a lot of lids in this fast-paced, modern world. There are lids for ketchup bottles. Learn more about could your gas cap be costing you money.

By Josh Peterson, Planet Green

DIY Vehicle Care: Spark plug vs. Fuel economy, Part I. In this aritcle learn the differences between spark plugs and fuel economy.

By Eric J. Leech, Planet Green

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Get money for your old car batteries. Learn how you can get money for your old car batteries from this article.

By Josh Peterson, Planet Green

Synthetic vs. Conventional motor oil: Which is best for you needs and environment's? Learn more in this article.

By Eric J. Leech, Planet Green

Here are seven easy ways to reduce your emissions without affecting the quality of your daily commute. Learn more about the top 7 ways to reduce your driving emissions without reducing quality of life.

By Eric J. Leech, Planet Green

Are there worrisome sounds coming from under the hood? Whether it's an annoying ping, a persistent knock, or a dramatic detonation, there are many ways to soothe a noisy engine.

By Cherise Threewitt

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As engines have evolved over the years, so have the pistons within them. In fact, the shape of a piston has a dramatic effect on the combustion process.

By Patrick E. George

Reducing your vehicles carbon footprint is as easy as 1...2...recycle. Learn more about the 6 automotive parts you can easily recycle.

By Eric J. Leech, Planet Green