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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 Diesel Engines Work

Ever wonder what the difference is between a gasoline engine and a diesel engine? Diesels are more efficient and cheaper to run than gasoline engines. Learn what makes diesel engines different!


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 »

 What are the types of internal combustion engines?

What are the types of internal combustion engines? Visit HowStuffWorks.com to learn the types of internal combustion engines. See more »

The Ultimate Hot Bulb Engine Quiz

 The Ultimate Hot Bulb Engine Quiz

How well do you know hot bulb engines? Take the Ultimate Hot Bulb Engine quiz to find out! See more »

How a Hot Bulb Engine Works

 How a Hot Bulb Engine Works

What were hot bulb engines? Read about hot bulb engines at HowStuffWorks Auto. See more »

How Direct Injection Engines Work

 How Direct Injection Engines Work

Direct injection engines offer high efficiency and performance. Learn how direct injection engines work at HowStuffWorks. See more »

How In-wheel Motors Work

 How In-wheel Motors Work

The in-wheel motor may make many of your car's components obsolete. Read about in-wheel motors and learn how they work in this article. See more »