HHO Diagrams for Cars. 1. Your car engine works on a mixture of Air + Fuel. 2. This Air + Fuel mix is ignited by a spark – creating an explosion. 3. The power of these explosions rotate the engine. 4. The Power of the explosion is determined by the mixture of Air + Fuel. 5. HHO Kit enrich the “Air” with Hydrogen (as you can see in the diagram) – that is explosive by itself! 6. Mixing Hydrogen + Fuel gives you a greater explosion.