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Bring the fascinating principles of heat and vacuum power to your desk. The RETROL VE-02 is a ready-to-run flame licker vacuum engine featuring a solid copper cylinder, an integrated cooling system and a belt-driven generator that can light up the included street lamp.
Watch the flame heat the working cylinder, see the flywheels turn and discover how the engine converts heat energy into mechanical motion. No complicated assembly is needed to get started.
Less setup frustration, smarter cooling details, a working generator and hands-on mechanical controls — the VE-02 is designed to be enjoyed straight away and explored in depth.
No piles of loose parts or hours spent aligning gears and adjusting components. The VE-02 arrives as a ready-to-run model, assembled and tested before shipping, so you can spend less time troubleshooting and more time enjoying the engine.
The cooling chamber is built right into the solid copper cylinder. A custom fine-spout stainless-steel filling cup makes adding water much more controlled, helping you avoid spills on the wooden base and nearby hardware.
A belt connects the running engine to a miniature generator. As the flywheels turn, the generator produces electricity to light the included street lamp — a satisfying demonstration of heat, motion and electrical power working together.
Explore the built-in alcohol fuel cup, lockable flame-adjustment handwheel, timing degree wheel and support for both dry and wet lubrication. These practical details give experienced enthusiasts more to inspect, adjust and appreciate.
The solid copper cylinder is one of the defining features of the VE-02. Its machined finish gives the engine a distinctive mechanical character while serving an essential role in its heat-driven cycle.
The VE-02 features an integrated evaporative cooling arrangement. Its pump-free design keeps the system straightforward while adding another interesting mechanical detail to explore.
The cooling port on the solid copper cylinder is intentionally compact. Pouring water straight from a bottle can be awkward and messy, leaving unwanted spills on your wooden base and nearby metal hardware.
The custom fine-spout stainless-steel filling cup gives you better control when adding water. Direct the flow where it needs to go, add the right amount and help keep the surrounding base clean and dry.
A useful detail to know: This is a dedicated filling tool, not a circulating water tank. The cooling chamber is neatly integrated inside the copper cylinder.
The integrated fuel cup and wick supply the flame that drives the engine's operating cycle. Use only the recommended fuel: 95% ethanol or anhydrous ethyl alcohol.
Important: Isopropyl alcohol and rubbing alcohol are not suitable substitutes.
The VE-02 gives you more than basic flame control. Its adjustable flame handwheel and integrated timing degree wheel let you explore two essential aspects of engine tuning: heat control and valve timing.
Adjust the flame to regulate the heat supplied to the cylinder and fine-tune the engine's operating speed, with an adjustable range of approximately 200–1,000 RPM. The lockable handwheel helps keep your chosen flame setting in place during operation.
For more precise adjustments, the timing degree wheel is built directly into the valve rocker assembly—not added as a separate accessory. As you adjust the valve timing, the degree wheel moves in sync with the mechanism while the fixed pointer provides a clear reading. This helps you find and record the valve opening position that works best for the flame licker's vacuum cycle.
Found your ideal settings? Record the angle and return to it after cleaning, lubrication or reassembly, instead of starting the tuning process all over again.
With both controls exposed and easy to observe, the VE-02 makes mechanical adjustment part of the experience—not just something happening inside the engine.
Let's face it—most desktop engine models simply spin their flywheels. The VE-02 takes the experience a step further.
Discreetly mounted on the side, a belt-driven generator converts the engine's mechanical rotation into electrical power (5–24V). Connect it to the miniature retro street lamp included in the box, and watch it come to life as the engine runs.
It's a fascinating demonstration of energy conversion in action: heat drives motion, motion generates electricity, and electricity brings light. No complicated theory required—just a working energy loop you can see happening right on your desk.
A flame licker engine uses heat and cooling to create pressure differences that drive a piston and turn the flywheel.
The flame heats the working cylinder and the air inside it.
The engine's valve timing and cooling cycle create pressure differences that move the piston.
The moving piston drives the crank mechanism and flywheels, producing continuous rotation while the engine is operating.
The rotating engine drives the belt-connected generator, which can power the included street lamp.
| Model | RETROL VE-02 |
| Engine Type | Flame Licker Vacuum Engine |
| Operation | Ready to Run |
| Cylinder Material | Solid Copper |
| Cooling System | Integrated Evaporative Cooling |
| Speed Range | 200–1,000 RPM (adjustable) |
| Generator Output | 5–24V |
| Recommended Fuel | 95% Ethanol / Anhydrous Ethyl Alcohol |
| Dimensions | 250 × 100 × 150 mm |
| Weight | Approx. 1,300 g |
| Base Material | Wood |
The package includes the engine and the accessories needed for operation and basic maintenance.
Age recommendation: 16+. Minors must use the engine under adult supervision.
Outdoor operation only: Operate outdoors in a well-ventilated area. Never run the engine indoors, in a garage, shed or other enclosed space. Combustion can produce carbon monoxide, which is dangerous and can be fatal.
Hot surfaces: The flame, cylinder and other engine components become hot during operation. Do not touch them while running or before they have cooled down.
Fuel: Use only 95% ethanol or anhydrous ethyl alcohol. Keep fuel away from flames and other ignition sources when filling. Never refill a hot or operating engine.
Operating time: Maximum continuous runtime is 20 minutes. Allow the engine to cool for at least 10 minutes before using it again.
Supervision: Keep the engine away from children, pets, flammable materials and unattended areas during operation.
The VE-02 is supplied as a ready-to-run engine. Please refer to the included instruction manual for setup, fuel preparation and operating guidance.
Use 95% ethanol or anhydrous ethyl alcohol. Do not use isopropyl alcohol or ordinary rubbing alcohol as a substitute.
No. Always operate the engine outdoors in a well-ventilated area. Combustion can produce carbon monoxide, so indoor use, including garages and sheds, is not safe.
The recommended maximum continuous runtime is 20 minutes. Allow the engine to cool for at least 10 minutes before operating it again.
Yes. The belt-driven generator produces an output of 5–24V and can power the included street lamp when the engine is running.
Yes. The flame adjuster allows you to regulate the operating speed. The stated speed range is approximately 200–1,000 RPM, depending on operating conditions.
No. The VE-02 uses an integrated evaporative cooling design that does not require a separate water pump.
The ready-to-run format makes it easier to get started. However, it is a working flame-powered model with hot surfaces and flammable fuel, so users should read the manual and follow all safety instructions before operation.
Explore the fascinating world of flame licker engines with the RETROL VE-02 — a working mechanical model made for enthusiasts, collectors and curious minds.