Animated Engines

Animated Engines turns 21 power-making mechanisms into compact moving explainers. Pick a familiar four-stroke or wander toward a grasshopper beam, Ross-yoke Stirling, or revolving-cylinder oddity; each page pairs the machinery with plain-language context instead of burying the useful bit in a textbook chapter.

What is Animated Engines?

The homepage is a tidy cabinet of mechanical curiosities: internal-combustion staples sit beside steam engines, Stirling arrangements, jet propulsion, and designs that sound almost fictional until the parts begin tracing their paths. The four-stroke page, for example, separates intake, compression, power, and exhaust into distinct stages, then adds an ignition-system note for anyone still following the spark. Matt Keveney built the illustrations with an unusually patient process, shifting grouped CAD parts frame by frame before turning them into web animation. That handmade precision is the site's quiet charm. It is less a glossy simulator than a stack of very careful moving diagrams, ready for a quick lesson or a long mechanical rabbit hole.

What you can do there

• Choose an engine and inspect its motion
• Read the stages and mechanical explanation

Why we picked it

It makes complicated motion legible without sanding away the eccentricity of the machines themselves. The index is broad enough to reward wandering, while individual pages stay focused enough that a curious visitor can leave knowing why a piston, valve, crank, or hot-air cycle moved the way it did.

How to get the most from it

Start with Four stroke to learn the site's visual grammar, then compare Diesel or Two stroke while those stages are fresh. After that, jump to Wankel, Gnome Rotary, or one of the beam engines and watch how far designers can travel from the familiar piston-and-crank arrangement. Use the documented pause, speed, and frame controls when your browser offers them.

Good to know

This is a lovingly preserved older reference, not a newly maintained engineering simulator. The dated history ends with a 2011 redesign, and Keveney describes the project as long-unupdated. Pages are in English, the core material moves, control support varies by browser and device, and the site's original illustrations are not offered for general republication.

Who made it, and when?

Matt Keveney is the credited creator or organization. The earliest supported launch date we found is August 2000. A documented update was recorded November 23, 2011.