- Auto Math Calculations - Features technical articles and several calculation tools for evaluating the thermodynamic efficiency of engines.
- Carbuinyector - Provides information on a new automotive technology that could help to lower emissions from an internal combustion engine and increase fuel efficiency.
- Carnot Cycle - Explains the basics of the Carnot cycle. Includes thermodynamic diagrams and theorems.
- Concept Engine - Describes different engine design concepts, sorted by nation, as well as some support systems. Addresses efficiency and performance, insights, characteristics, with pictures and animations.
- CSU Engine Web Pages - Thermodynamics, heat transfer and fluid mechanics in internal combustion engines. Applets are used to perform simple calculations. Developed at Colorado State University.
- Four Stroke Internal Combustion Engine - Explains the strokes of internal combustion engines using animations from the Glenn Research Center.
- HowStuffWorks: How Automobile Ignition Systems Work - Explains the basics of ignition systems in Otto cycle engine. Includes technical animations and drawings.
- HowStuffWorks: How Car Engines Work - Explains the basics of Otto cycle engines. Include technical drawings and animations.
- HowStuffWorks: How Does a Miller Cycle Engine Work - Explains the technical and historical background of the Miller cycle.
- Hydrogen Developed Technology Inc. - Provides information on hydrogen generators that save fuel, increase MPG, reduce emissions, and increase power and torque by injecting hydrogen into the combustion chamber of internal combustion engines.
- Improve MPG: The Factors Affecting Fuel Economy - Presents a methodology to assess engine's performance as well as one's own driving habits to improve driving efficiency.
- Kruse Limited Temperature Cycle - Describes an innovative thermodynamic engine cycle which limits peak combustion temperature in direct injection petrol, gasoline and diesel engines. Includes engine cycle overview and description, references, diagrams and patents.
- Wikipedia: Carnot Heat Engine - Free encyclopedia article explaining the Carnot cycle, with emphasis on engines.
- Wikipedia: Internal Combustion Engine - Free encyclopedia article covers internal combustion engine technology and applications. Addresses operation modes, thermodynamic cycle and efficiency, fuel types, support systems and parts.
