ASME: Internal Combustion Engine (ICE) Division: Encourages research, development and data exchange among its members. Includes events, publications, codes and standards, and contact information.
Auto Math Calculations: Features technical articles and several calculation tools for evaluating the thermodynamic efficiency of engines.
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.
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.
Internal Combustion Engine Simulator: Visual applet simulating a four stroke Otto engine, with user changeable parameters. Shows the Carnot cycle and thermodynamic measures.
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.