This prototype uses water cooling, PTFE rings, and 3D‑printed mounts to turn 200‑year‑old heat‑engine tech into a self‑propelled ride.
Aerospace engineer and content creator Tom Stanton has documented the step‑by‑step construction of a bicycle driven by a Stirling engine, a heat‑powered machine first patented in 1816. The 18-minute YouTube episode tracks the project from initial desktop experiments to a short but fully self‑propelled test run, offering a real‑time look at the hurdles that keep Stirling engines on the fringe of modern transport.
’Scaling a desktop demo into a frame‑filling engineStanton opens the video by heating a glass syringe: as the trapped air expands, it pushes the plunger outward, an “air engine” in miniature. A second syringe fitted with a loose displacer piston shows how shuttling air rapidly between a hot and a cold zone speeds the cycle. Using that principle, a small model Stirling engine spins happily on a benchtop, convincing Stanton to aim for a full‑scale unit large enough to fit inside a bicycle frame and deliver roughly 100 to 150 watts, or about 15 miles per hour on level ground.The main engine block is machined from aluminum; its hot cap, which must withstand red‑hot temperatures, is outsourced in steel. Early in the design, Stanton rejects a computer‑CPU heatsink for cooling. The contact area is too small and commits to an internal water‑cooling loop. Friction becomes a central concern because even tiny losses threaten the modest power target. The power piston receives low‑friction PTFE rings backed by tensioners, and linear bearings cribbed from 3D‑printer hardware keep the displacer rod centred.A 3D‑printed bracket lets the partially finished engine sit in the bicycle’s front triangle while Stanton fabricates an aluminum rear support that carries twin crankshafts. Those cranks, first cut from solid aluminum and later remade in lightweight resin for testing, turn a timing pulley connected by a belt, chosen instead of gears, to synchronise the displacer and power pistons.Troubleshooting leaks, friction, and over‑compressionInitial fire‑ups fail. With the hot cap glowing and the water‑cooled end near 40 °C, Stanton strips the engine to check silicone gaskets and grease the displacer‑shaft O‑ring. Compression testing shows serious blow‑by past the PTFE rings, so he experiments with a rubber O‑ring before designing a flexible piston ring printed from TPU. The new ring seals tightly enough that the piston now rebounds when the crank is turned by hand, a sign of recovered pressure.A second stall prompts another diagnosis: stroke length. His analysis reveals that the crank’s 30‑millimetre throw pushes the piston farther than the air and can expand efficiently. Stanton shortens the crank to 25 millimetres and lengthens the displacer stroke to move more air between hot and cold ends. With the revised geometry and resin cranks installed, the engine finally catches and spins on its own, running almost silently on a small burner.A proof of concept with clear limitsOnce running, Stanton thins the timing belt to cut bending losses and swaps the rear‑wheel drive pulley for a flywheel so the engine can gather speed before engaging the drivetrain. Even so, the prototype remains a low‑power novelty; it needs a lengthy warm‑up, offers limited torque, and cannot be throttled easily. Stanton outlines next steps. Adding a regenerator to recycle heat, pressurising the working air for higher output, completing a radiator‑based cooling loop, and building a clutch to make the bike more practical.Although the machine is not positioned as an alternative to battery‑electric bicycles, the project demonstrates how modern hobby‑grade machining, 3D printing, and mail‑order CNC services let a lone engineer revive a centuries‑old thermodynamic idea. The video closes with the engine still spinning, powered only by the heat stored in its steel cap, showing a working design that runs as long as there is a difference between hot and cold.
Bike DIY Engine Heat Powered Homemade Inventions And Machines Mechanical Engineering Sterling Engine Youtuber
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