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4 Stroke Engine Simulation
http://www.chemcollective.org/applets/engine.php
Throughout this applet, we are developing the base code for what we believe to be a powerful and general approach to educational software: computer simulations that allow students to interact with different components of a complex real world phenomenon.The simulation shown here is of a 4-stroke internal combustion engine.
The thermodynamic cycle being simulated is the Otto cycle, which involves an isentropic compression, an explosion at constant volume, a isentropic expansion, and the release of the exhaust at constant volume to return to the original pressure. The initial interface allows for students to interact with the ideal-gas law portion of the simulation.

TeachMe D and T
http://www.teachme-dt.com
A site dedicated to the teaching and learning of design and technology.
You will find resources, hints and tips on teaching and revision material.

Engineering Student Forum
http://www.engineeringstudent.co.uk
Engineering Student Forum
Discussion forums helping university students learn about engineering topics with worked examples, revision sheets and useful links.

4-stroke heat engines | Internal combustion engine |
http://www.forgefx.com/casestudies/prenticehall/
Free online interactive multimedia 3D resource designed for a middle grades science programs.
Most automobiles use four-stroke heat engines. These four-strokes occur repeatedly in each cylinder in the engine. This is a real-time 3D simulation which allows the student to explore how a four stroke engine works and to gain an understanding of the different strokes involved.
4-stroke heat engines | Internal combustion engine |

Tech It Out (uk)
http://www.techitoutuk.com/
Tech it Out UK is a Free web site. For use by Anybody, Anywhere and at Anytime.
To Provide a unique central hub for the dissemination of Design Technology knowledge.

Technology Student
http://www.technologystudent.com/
Technology Student
This website contains numerous information sheets which will be helpful if you are studying or teaching DESIGN TECHNOLOGY. The information sheets cover a wide range and include, the design process, gear systems, electronics, cams, printed circuit boards, PIC microcontrollers / computer control, key words/phrases, structures, vocational work, technology and cultures, basic CNC work. They are intended to provide a valuable resource for teachers and pupils AND they are free.