Build Your Own GEET Reactor

Introduction

This guide covers the construction of a GEET (Global Environmental Energy Technology) reactor for small engines under 20 HP — the "free internet plans" that Paul Pantone released to the public in 1998. This version is suitable for lawn mowers, small generators, and experimental purposes.

The GEET system replaces the standard carburetor with a fuel processing system that uses exhaust heat to vaporize and reform fuel before it enters the engine. The core components are:

• The Bubbler — Vaporizes the fuel mixture using exhaust heat
• The Reactor — Reforms the vaporized fuel through heat exchange
• Control Valves — Regulate air and fuel vapor flow

Required Materials

Reactor Components

Item	Specification	Notes
Outer tube (exhaust chamber)	16-7/16" black iron pipe, 3/4" diameter, threaded both ends	Standard plumbing pipe works
Reactor rod	12" x 1/2" steel rod	Cold-rolled steel preferred; stainless also works
Reducing tees (2)	1" x 1/2" x 1/2" black iron	Connect tubes at each end
Copper washers (2)	1/2" ID, 3/4" OD	Seal the rod at each end
Pipe nipples	1/2" x 2" (2 pieces)	Connect reactor to bubbler and engine
Ball valves (2)	1/2" brass	Air and fuel vapor control

Bubbler Components

Item	Specification	Notes
Container	1-gallon plastic jug (antifreeze container works well)	Must be heat-resistant; metal is better for longevity
Copper tubing	1/2" OD, approximately 3 feet total	For inlet and outlet lines
Steel wool or pot scrub pads	4-6 pads	Increases surface area for vaporization
Ballcock valve	Standard toilet fill valve type	Air inlet control
Rubber stopper or cork	Size to fit container opening	Drilled for tubing and valve
Hose clamps	Various sizes	Secure all connections

Additional Materials

• High-temperature silicone sealant (exhaust-rated)
• Teflon tape for all threaded connections
• Flexible fuel-rated hose (if needed for connections)
• Mounting brackets and hardware
• Wire for securing components

Required Tools

• Pipe wrenches (2)
• Adjustable wrenches
• Drill with metal bits (for mounting holes)
• Hacksaw or pipe cutter
• Tape measure
• Files for deburring
• Propane torch (for bending copper tubing)
• Safety glasses and work gloves

Step-by-Step Construction

Step 1: Prepare the Reactor Rod

The reactor rod is the heart of the system. Proper preparation is critical.

1. Cut the rod to length: The 12" rod should fit inside the outer tube with approximately 1/2" clearance at each end.
2. Center the rod: The gap between the rod and the inner wall of the pipe should be approximately 1/32" to 1/16" (0.8-1.6mm). This narrow annular gap is critical for proper fuel vapor processing.
3. Smooth the ends: File any burrs or rough edges. The rod must be smooth.
4. Check straightness: Roll the rod on a flat surface. Any bend will affect performance.

Step 2: Assemble the Reactor

1. Apply Teflon tape to all threaded connections before assembly.
2. Thread the outer pipe into the first reducing tee. Tighten securely.
3. Insert the reactor rod through the center of the assembly. The copper washers should seal at each end.
4. Thread the second reducing tee onto the other end of the outer pipe.
5. Install pipe nipples into the remaining ports of the reducing tees:
   • One side connects to the bubbler output (fuel vapor inlet)
   • Other side connects to the engine intake manifold (processed vapor outlet)
   • Side ports connect to exhaust flow
6. Verify alignment: The rod must be centered. Rotate the assembly — there should be no binding or contact between rod and tube.

Step 3: Build the Bubbler

1. Prepare the container: Clean thoroughly. If using a plastic antifreeze jug, ensure it's fully rinsed of any residue.
2. Drill the cap/stopper: You need three holes:
   • Exhaust inlet tube (brings hot gases into the liquid)
   • Vapor outlet tube (carries vaporized fuel to reactor)
   • Air inlet valve (controls air mixture)
3. Install the exhaust inlet tube: This tube should extend down near the bottom of the container (about 1" from bottom) so exhaust bubbles through the fuel mixture.
4. Install the vapor outlet tube: This tube should only extend about 1" below the cap — it collects vapor from above the liquid level.
5. Add steel wool or pot scrub pads: Place loosely in the container. These increase surface area for better vaporization.
6. Install the ballcock valve: This controls how much air is drawn into the system and mixed with the fuel vapor.
7. Seal all penetrations: Use high-temperature silicone. No leaks allowed.

Step 4: Connect the System

The flow through the system follows this path:

1. Connect exhaust to reactor: Hot exhaust gases enter the outer chamber of the reactor (the space between the outer tube and inner tube assembly).
2. Connect reactor exhaust outlet to bubbler inlet: The partially cooled exhaust then flows into the bubbler, bubbling through the fuel mixture.
3. Connect bubbler vapor outlet to reactor inlet: The vaporized fuel-air mixture enters the inner chamber of the reactor.
4. Connect reactor vapor outlet to engine intake: The processed vapor enters the engine's intake manifold where the carburetor was removed.
5. Install control valves: Place ball valves in-line to control vapor flow and air mixture.

Step 5: Remove the Carburetor

1. Disconnect fuel line from the carburetor. Cap it off.
2. Remove throttle linkage — you may need to devise a new throttle control connected to your ball valve.
3. Unbolt the carburetor from the intake manifold.
4. Create an adapter plate or use appropriate fittings to connect the reactor output to the intake manifold. A good seal is essential.
5. Keep the original carburetor — you may need it for initial warm-up or to revert the engine.

Step 6: Mount All Components

1. Reactor orientation: Mount with the hot (exhaust) end pointing toward magnetic North. Use a compass. This orientation may affect rod magnetization.
2. Secure mounting: All components must be firmly mounted. Vibration will loosen connections and cause leaks.
3. Protect from heat: While the reactor needs heat to function, the bubbler and plastic/rubber components need protection from direct heat exposure.
4. Accessibility: Mount control valves where you can easily adjust them during tuning.

Tuning and Operation

Initial Startup (Critical)

1. Initial fuel: For first tests, use straight gasoline in the bubbler (no water mixture yet).
2. Start with conventional carburetor: If possible, start the engine on its original carburetor and let it warm up.
3. Gradually switch over: Slowly open the GEET valve while closing the carburetor throttle until the engine runs entirely on GEET vapor.
4. Monitor exhaust temperature: The reactor needs to reach operating temperature (200-400°F at minimum) to function properly.

Tuning the Mixture

1. Air valve adjustment: Start with the air valve nearly closed. Gradually open it while listening to the engine.
2. Vapor valve adjustment: Controls how much fuel vapor reaches the engine. Too much = rich, black smoke. Too little = lean, misfiring.
3. Listen for:
   • Smooth, steady idle
   • Good throttle response when opening valves
   • No backfiring or misfiring
4. Watch the exhaust: Properly tuned GEET should produce very little visible exhaust. Black smoke = too rich. White smoke = normal during warm-up.

Water-Fuel Mixtures

Only after successfully running on straight gasoline should you experiment with water mixtures:

1. Start conservative: Try 10-20% water mixed with gasoline first.
2. Increase gradually: Some builders report success with up to 80% water, but this requires a fully heated, properly tuned system.
3. Monitor engine behavior: Any roughness, hesitation, or power loss indicates the mixture is too lean or the reactor isn't hot enough.
4. Temperature matters: Higher water ratios require higher reactor temperatures for successful vaporization and reformation.

Rod Length and Fuel Type

According to Pantone's documentation, rod length should be adjusted based on fuel type:

• Lighter fuels (gasoline, alcohols) = shorter rod
• Heavier fuels (diesel, waste oil) = longer rod

The 12" rod specified in this guide is designed for small engine gasoline operation. Larger engines and heavier fuels may require experimentation with longer rods.

Troubleshooting

Engine Won't Start on GEET

Symptom	Likely Cause	Solution
No vapor reaching engine	Blocked line, closed valve	Check all connections and valve positions
Fuel not vaporizing	Reactor too cold	Run on carburetor longer to heat system
Leaks in system	Poor seals, loose fittings	Check all connections with soapy water
Too much air	Air valve too open	Close air valve, start with minimum air

Engine Runs Rough

Symptom	Likely Cause	Solution
Misfiring, hesitation	Mixture too lean	Close air valve slightly, open vapor valve
Black smoke, sluggish	Mixture too rich	Open air valve, reduce vapor flow
Backfiring	Timing issues or air leaks	Check for intake leaks, verify timing
Power loss at high RPM	Insufficient vapor volume	May need larger reactor for engine size

Bubbler Issues

Symptom	Likely Cause	Solution
Fuel spitting into lines	Level too high, violent bubbling	Lower fuel level, check exhaust flow rate
No bubbling	Blocked inlet tube, exhaust leak	Clear obstruction, check exhaust connections
Bubbler overheating	Too much exhaust heat	Add heat shielding or increase tubing length
Container melting/deforming	Plastic can't handle heat	Switch to metal container

Common Mistakes

• Not enough warm-up time — The system needs heat to work. Be patient.
• Rod not centered — If the rod touches the tube, the system won't work properly.
• Leaks anywhere in system — The system operates under vacuum; any leak ruins performance.
• Wrong flow direction — Counter-flow is essential. Double-check your plumbing.
• Starting with water mixture — Master straight fuel operation first.
• Ignoring magnetic orientation — Orient reactor with hot end toward magnetic North.

Safety Reminders

Resources and Downloads

Paul Pantone released the GEET plans freely for humanity. We preserve that legacy by making all documentation available.

Join the Community

Thousands of builders worldwide have constructed GEET reactors. The most active communities are in France, where the "Gillier-Pantone" system has been adopted by farmers and experimenters alike.

Document your build. Share your results. Pantone wanted this technology in everyone's hands. Every successful replication is a testament to his legacy and a step toward energy independence.

"I could have been a rich man, but I wanted to change the world." — Paul Pantone