- Animated Engines
 - Features animated diagrams that explore how various internal combustion and steam engines work. - Combustion Institute (2)
- Concept Engine
- Discusses engine design to address such problems as better fuel economy and cleaner and more efficient engines.
- DieselNet
- Focusing on diesel emissions and their control. Includes technical reports, emission standards, and a company directory.
- Elements of Frasca Rotary Engine Design
- Discusses the characteristics, structure, and operation of an engine that does not need intake and exhaust valve systems.
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