The Stirlingkit Retro SE-02 comes with a standard alcohol burner, which works well but can cause some soot buildup on the boiler over time and may not always offer a perfectly stable flame, requiring extra attention during operation and cleaning.
In this tutorial, we follow the approach of a UK model enthusiast to complete two upgrades:
1️⃣ Replace the original alcohol burner with a gas burner for cleaner combustion.
2️⃣ Install a condenser pot to collect condensate from the exhaust, keeping your workspace clean.
🎥 Watch the full video tutorial:
Why Upgrade?
Issues with the original alcohol burner (using UK purple methylated spirits as an example):
- 🔸 Produces black soot that discolors the boiler exterior.
- 🔸 Flame is unstable, and heating performance is limited.
- 🔸 Cleaning the boiler and firebox can be time-consuming.
The gas burner offers:
✅ Stable, clean flame
✅ Nearly smoke- and odor-free
✅ Boiler exterior stays metallic and clean
Materials Needed
| Material | Purpose |
|---|---|
| Aluminum sheet (Dural plate) | To make a firebox base cover and seal the original burner hole |
| Small gas burner (e.g., Bix Gas Burner) | Replaces the alcohol burner; must fit firebox opening |
| Copper pipe (scrap is fine) | Makes the condenser pot |
| Rubber tubing and connectors | Connect exhaust to condenser pot |
| Tools | Drill, tin snips, screwdriver, sandpaper, etc. |
Step One: Upgrade to Gas Burner
1️⃣ Remove the Original Alcohol Burner
- Loosen the metal straps securing the boiler.
- Disconnect the steam pipe and remove the boiler.
- The original burner opening at the firebox base is now exposed.
2️⃣ Fabricate and Install the Cover Plate
- Cut an aluminum plate to fit the firebox opening.
- File edges smooth and place inside the firebox.
- The plate seals the hole and provides stable support for the gas burner.
3️⃣ Install the Gas Burner
- Position the gas burner centrally in the firebox.
- Adjust the flame to focus on the boiler base.
- Reattach the boiler and steam pipe, then test ignition.
💡 Note: Make sure the gas burner size fits your firebox to avoid instability or gas leaks.
Step Two: Make a Condenser Pot
The condenser pot collects oil and water from the exhaust, keeping the desk clean.
1️⃣ Fabricate the Body
- Use a 5–6 cm length of copper pipe and seal the bottom.
- Drill a hole at the top and install a steam fitting to connect to the exhaust.
- Optional: Add a removable cap for easy cleaning.
2️⃣ Connect to the Exhaust Pipe
- Use rubber tubing to connect the boiler exhaust to the condenser pot.
- During operation, condensate and oil are collected inside.
💡 Tip: This DIY condenser is very basic and functional; it is not designed for aesthetics.
Testing and Operation
- Fill the boiler with water, ignite the gas burner, and the boiler heats quickly.
- The engine can drive Empire windmill + water pump and a Ferris wheel simultaneously.
- Can also power a small generator and street lamp; output is stable.
Summary of Modifications
| Upgrade | Effect |
|---|---|
| Gas burner | Stable, clean flame; boiler stays metallic and clean |
| Condenser pot | Collects exhaust condensate, keeps workspace clean |
| Overall performance | Smooth output, able to drive multiple accessories |
Safety Notes
- Check all gas connections for leaks before ignition.
- Keep away from flammable materials and avoid direct contact with flame.
- Modifying the engine may void warranty; proceed at your own discretion.
- For a more refined condenser pot, refer to tutorials by Keith Appleton or Blue Heeler.
Conclusion
With these two upgrades, the Stirlingkit Retro SE-02 runs cleaner, more efficiently, and looks fantastic in operation. If you own one, why not give it a try? Upgrade your engine with a gas burner and a condenser pot, experience the improved performance, and enjoy the fun of DIY steam engine modifications. Share your results, photos, or videos with the community, and see what creative setups others have come up with! 🔥
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