The water injection, essential effects

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Some key points to know about liquid water injection and alcohol in engines

These remarks relate to petrol engines only.

  • The maximum torque of an engine is obtained with an Air-Fuel ratio of 13.2.
  • Injecting more efficient water is with a report 50 / 50 alcohol.
  • Methanol as an additive is not a wise choice because: it helps pre-ignition (although its octane rating is higher than 120) and is delicate to handle.
  • Denatured alcohol, sold 95%, is inexpensive and can be found quite easily. (Alcohol to burn). Isopropyl alcohol may be used but it already contains 30% more water.
  • The injection of water allows more efficient lighting, closer to the top dead center and gives a better couple.
  • The water / fuel ratios should be based on weight, not volume.
  • "Wealth" in "water" or "water / alcohol" must be between 12,5 and 25%. This means that the air ratio falls to 11.1: 1 or 10.0: 1 with water injection.
  • The atomization of the water is directly related to its efficacy in the engine. Over the droplets, the better it cool admission.
  • Do not inject water through an intercooler.
  • The injection of water allows for better power and power pressures while avoiding the best supplies pressure détonnations.Les increase torque.
  • the fuel pumps can not be used to inject water. The water is conductive and corrosive unlike fuels.
  • The injection of water cools the engine parts of the following: cylinder head, pistons and valves. The exhaust temperature is not affected by the injection of water if it is in good proportions.
  • This cooling greatly reduces rattling and uncontrolled precombustion.
  • The most important compression rates can induce a% water or greater water-alcohol.
  • The most important exhaust temperature is reached to a wealth of 0.75 or 13.2 ratio to 1.
  • Ferrari used a fuel / water emulsion in 80 years. It is a very complicated method that acetone and water are miscible ...

- The water injection in Brief
- The injection of water in the Messerschmitt
- Water injection by emulsifying for marine engines
- The aquasol developed by Elf
- NACA report 1942
- NACA report 1944


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