28 articles in DIY Guides
Building your own HHO generator requires sourcing the right materials — 316L stainless, proper gaskets, and safe electrolyte. This sourcing guide saves you from common expensive mistakes.
Proper electrical wiring is the difference between a safe, reliable HHO installation and a fire risk. This wiring guide covers relays, fuses, PWM connections, and the right wire gauge.
Before connecting your HHO generator to your engine, bench testing confirms correct output, identifies leaks, and establishes the electrical parameters you'll operate at.
Installing an EFIE on your fuel-injected vehicle is the essential final step in any HHO installation. This guide walks through locating the O2 sensor wire, splicing the EFIE, and tuning it correctly.
HHO installations can trigger specific OBD-II codes. Understanding which codes are HHO-related and how to resolve them is essential knowledge for any HHO system owner.
Mineral deposits and oxidation on HHO plates reduce efficiency over time. Cleaning with white vinegar restores near-new performance in under an hour without disassembly.
Gasket deterioration is the most common cause of HHO cell leaks. Here's how to identify failing gaskets, choose the right replacement material, and perform the replacement correctly.
An oil catch can intercepts crankcase oil vapors before they coat your intake valves, throttle body, and MAF sensor — making it an ideal companion modification to any HHO system.
Running multiple HHO cells on a vehicle with a small stock alternator can strain the charging system. Here's how to assess your alternator capacity and upgrade if needed.
Boost leaks between the turbocharger and engine reduce power and fuel economy by preventing full manifold pressure from reaching combustion. A $20 DIY tester finds them instantly.
Both catch cans and air-oil separators prevent PCV oil vapors from reaching your HHO intake tap — but they work differently and suit different engine types.
Advanced HHO users combine their generators with piggyback ECU tuning modules for more precise fuel correction than a basic EFIE provides — here's how they work together.
A wideband air-fuel ratio gauge reveals exactly what lambda your engine is running at any moment — the most precise HHO and EFIE tuning tool available to DIY installers.
The relay is the critical safety component that disconnects HHO power with the ignition. Choosing the wrong relay or wiring it incorrectly causes the most common HHO electrical failures.
An Arduino microcontroller can replace a basic PWM with a smart HHO controller that auto-adjusts duty cycle based on temperature, voltage, and RPM signals.
Installing HHO on a Class A motorhome offers more space than a passenger car but requires managing a larger engine, higher current draw, and ensuring safety in the enclosed coach environment.
Marine engines run at sustained high loads during cruising — ideal conditions for HHO supplementation. But the saltwater environment demands different construction choices.
Motorcycles have limited battery capacity and space — HHO systems must be sized carefully to avoid draining the electrical system while delivering meaningful fuel savings.
Fleet operators with high fuel costs have the most to gain from HHO. Multi-cell systems on commercial trucks show the fastest return on investment of any HHO application.
Mineral scale from tap water and KOH deposits reduce plate conductivity over time. Proper cleaning restores original performance without damaging the plate surface.
A check valve prevents intake vacuum from pulling water back from the bubbler into the engine. Proper sizing, orientation, and testing prevents expensive failures.
Cold temperatures reduce electrolyte conductivity and slow electrolysis. A few simple changes to concentration, warmup procedure, and component protection maintain year-round performance.
RV and motorhome engines run at steady cruise loads for long distances — perfect HHO conditions. Larger displacement means bigger cells and more impressive absolute savings.
Farm tractors run at high load for extended periods — field work, tillage, and harvesting. HHO supplementation on agricultural diesel engines can provide meaningful fuel savings across a farming season.
Standby and portable generators burn expensive fuel at fixed RPM. HHO supplementation improves combustion completeness and fuel efficiency in this constant-load, constant-speed application.
A cabin-mounted switch with indicator light lets you control HHO from the driver seat — useful for testing, emissions checks, and troubleshooting without opening the hood.
End caps seal the cell and provide electrical connections. The right material prevents electrolyte absorption, warping, and chemical degradation over years of HHO operation.
School districts with large diesel bus fleets have the scale to justify HHO programs. Multi-year case studies show meaningful savings while reducing children's exposure to diesel exhaust.