wa8yxm wrote:
The risk here is adding water to hot metal of your engine,, This promotes corrosion (Rust) and can lead to early engine failure. THat is a major risk, with major cost involved.
HHO and water injection are two different technologies. HHO involves injecting hydrogen and oxygen gas into the intake. The gasses will not combine into liquid water.
Water injection has been used in the past in military aircraft. When maximum power was required such as during takeoff, water was sprayed into the intake to prevent engine knock.