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 Diesel Two-Stroke Engines Work

Take diesel-engine technology, throw in a two-stroke cycle, and you've got the basis for the huge engines found in trains and big ships. Learn about the diesel two-stroke engine!


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 »

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 »

How the Wave Disk Generator Works

How the Wave Disk Generator Works

The wave disk generator propulsion system could revolutionize the way we move our vehicles. Read about what makes the wave disk generator so special. See more »

How an Atkinson Cycle Engine Works

How an Atkinson Cycle Engine Works

An Atkinson cycle engine can complete all four strokes with a single rotation of the crankshaft. Read more about Atkinson cycle engines at HowStuffWorks. See more »

How the Grail Engine Works

How the Grail Engine Works

What is the Grail Engine? Read about the Grail Engine and how it could change how we drive in the future. See more »