Interactive 3D engines your students can run, take apart in real teardown order and see inside. Tap any part to learn what it does. It works in any browser, on Chromebooks, laptops, tablets and phones, with nothing to install and no student accounts.
Every part moves on real geometry: pistons, rods, cams, valves, gears, chains, even the gearbox shifting through its gears.
Step through the teardown in the order a mechanic would. Bolts back out before each part comes off; clutches come apart plate by plate.
Watch the four-stroke and two-stroke cycles inside the cylinders, plus temperature and airflow views that show where the heat goes and how air, fuel and exhaust move.
A guided cycle tour for introducing a topic, and a find-the-part quiz for warm-ups and exit tickets.
Air-cooled pushrod twin: gear-driven cams, fork-and-blade rods, dry-sump oiling, 5-speed.
90° pushrod V8: cross-plane crank, distributor ignition, 4-barrel carb, V-belt accessories.
Liquid-cooled DOHC 16-valve four: fuel injection, wet clutch, 6-speed gearbox with a working shift drum.
Reed-valve motocross single: ports, transfers, expansion chamber, flat-slide carb, kickstart.
The go-kart and generator engine: overhead valves and pushrods, splash oiling, flywheel magneto, recoil start and a flyweight governor.
A vertical-shaft side-valve single: valves in the block beside the bore, an oil slinger, a flywheel magneto and an air-vane governor.
The air-cooled single and belt drive under most scooters: an overhead cam, a CVT whose rollers change the gear as it speeds up, a centrifugal clutch and final-drive gears.
A 50 cc piston-port two-stroke: loop-scavenged ports, a diaphragm carb that runs upside down, a centrifugal clutch and an automatic chain oiler.
A 3.0 straight-six: perfect balance, cam phasers that change the valve timing as it revs, direct injection, coil-on-plug and a twin-scroll turbo.
Where engines began: a double-acting cylinder, a slide valve worked by an eccentric, a crosshead, a big flywheel and a flyball governor.
A race dirt-bike engine: titanium valves on finger followers, a balancer shaft, fuel injection, liquid cooling and a 5-speed gearbox you can shift.
Two cylinders side by side with the crank pins 270° apart: an uneven V-twin rhythm, a balancer shaft, DOHC, liquid cooling and a 6-speed gearbox.
A 7.0 L pushrod V8 with a belt-driven Roots blower: two rotors carrying air, an intercooler, a bypass valve and boost you can watch climb.
A classic aircraft engine: five cylinders round one crank pin on a master rod and link rods, a cam ring, two plugs per cylinder, two magnetos and a wooden propeller.
How an electric car moves: three-phase hairpin windings that light up as the field turns, a magnet rotor, the inverter and a single 9 : 1 gear to the wheels.
A 900 cc motorcycle triple: crankpins 120° apart for an even 240° firing, a balance shaft for the rocking couple, DOHC and a 6-speed gearbox.
Cylinders out either side into the wind, pistons that cancel each other's shake, a dry single-plate clutch and a drive shaft to a crown wheel and pinion.
A modern cruiser twin to compare with the air-cooled 45°: water cooling with a radiator, overhead cams, one crankpin, a 300°/420° beat and a belt final drive.
A 15° V6 so narrow both banks share one head: zig-zag bores, six separate crankpins, finger followers of two lengths and long and short intake runners.
A 13 L truck inline-6: common rail, a big turbo, gear-driven cams, and a compression-release engine brake you can watch crack the exhaust valves open.
The light-plane engine: opposed air-cooled cylinders, pushrods from a cam under the crank, two magnetos and two plugs per cylinder, carb heat, a mixture control and a direct-drive propeller.
External combustion: a flame heats one end, fins cool the other, and a displacer shuffles the sealed air between them to push a power piston.
Wankel engine: triangular rotors, epitrochoid housings, apex seals, eccentric shaft, peripheral ports.
Common-rail compression-ignition four: high-pressure pump, injectors, glow plugs, turbocharger, EGR.
Per teacher. All engines for every student in your classes, plus new engines as they're added. Use it on the projector and on students' own devices.
The V-twin is free for everyone, with the full tour and quiz. Want the rest for a trial run with your class? Ask for a 30-day trial code.
Several teachers or schools? We'll put together one license and one invoice, with purchase-order billing.
Students don't sign up, log in or give us any personal information. Only the teacher has an account. If a student types a question to Sprocket, our cartoon mechanic, only the question and the engine on screen go to the AI that answers it, and nothing is kept. No ads, no tracking cookies, nothing sold. See the privacy policy.
Payments are handled by Lemon Squeezy as merchant of record, and invoices include tax where it applies. Cancel any time and keep access until the end of the paid year. All sales are final, so try the free V-twin or ask for a trial code first (see the terms).
Engine Walk is an independent teaching tool. Each engine is a teaching model inspired by well-known production layouts; it isn't made by, affiliated with or endorsed by any engine or vehicle maker.