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Auto | Under the Hood | Types of Engines

The types of engines you'll learn about in this section include diesel, rotary, HEMI, stirling and quasiturbine, to name a few. You'll also see photos and animated images of the technologies we explore.

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How Sleeve-valve Engines Work

The sleeve-valve engine may have already been dismissed as a historical relic; however, at least one company is seeking to bring the sleeve-valve engine back into action -- with a few modern twists.


The Two-stroke Engines Quiz

 The Two-stroke Engines Quiz

How much do you know about two-stroke engines? Test your knowledge with this quiz at HowStuffWorks. See more »

Did cars ever have external combustion engines?

 Did cars ever have external combustion engines?

Did cars ever have external combustion engines? Find out if external combustion engines have ever being used to power automobiles at HowStuffWorks. See more »

Inside an Opposed Piston Opposed Cylinder (OPOC) Engine

Inside an Opposed Piston Opposed Cylinder (OPOC) Engine

Do you know how Opposed Piston Opposed Cylinder (OPOC) engines work? Check out this amazing graphic that explains how OPOC engines work! See more »

Inside a Sleeve Valve Engine

Inside a Sleeve Valve Engine

Do you know how sleeve valve engines work? Check out this amazing graphic that explains how sleeve valve engines work! See more »

5 Benefits of Beltless Engines

 5 Benefits of Beltless Engines

Can you name the benefits of having a beltless engine? Keep reading to learn more about cars and 5 Benefits of Beltless Engines. See more »

How to Make a Coke Can Stirling Engine

 How to Make a Coke Can Stirling Engine

Do you know How to Make a Coke Can Stirling Engine? Keep reading to learn about engines and explore How to Make a Coke Can Stirling Engine. See more »

How does an electric water pump benefit your engine?

 How does an electric water pump benefit your engine?

How does an electric water pump benefit your engine? Read how an electric water pump can be more efficient and better for your engine's cooling needs. See more »

How the Hüttlin Spherical Engine Works

 How the Hüttlin Spherical Engine Works

How does the Hüttlin spherical engine work? Read about the Hüttlin hybrid auto engine at HowStuffWorks. See more »

How Sleeve-valve Engines Work

 How Sleeve-valve Engines Work

What is a sleeve-valve engine? Read more about sleeve-valve engine technology at HowStuffWorks. See more »

How Opposed Piston Opposed Cylinder (OPOC) Engines Work

 How Opposed Piston Opposed Cylinder (OPOC) Engines Work

What are the advantages and disadvantages of opposed piston opposed cylinder engines? Read about OPOC engines at HowStuffWorks. See more »