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Author Topic: Water Injection - truth  (Read 5900 times)
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Zeljko
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« on: September 05, 2008, 07:48:41 PM »

Water injection technology was developed during WWII to provide short-term emergency sprint power to super-charger equipped fighter planes engaged in combat at high altitudes - where there was less air to cool the piston powered engines of that era.  The super-charger would cram air into a fighter plane’s air inlet at manifold pressures close to those at sea level - enabling the same performance at high altitudes as with the richer air at sea level.  Yet, this crammed air was being compressed by the super-charger, it became heated - making the engine even hotter.  To lower the combustion chamber temperature, a pump sprayed a mist of water, or an alcohol-water mix, directly into the engine’s air intake.  That would permit a substantial increase in power for very brief periods.  Although modern vehicle engines tend not to be operated at high altitudes (except when crossing a high mountain pass in the Himalayas or Kashmir), the makers and/or promoters of water injection type devices claim it will increase a vehicle’s horsepower and fuel economy.  It should be noted that some makers and/or promoters of water injection type devices even claim that it is “a fuel cell hydrogen processor” having an “ultra-sonic barometric pressure chamber giving off ultra-sonic frequencies” which “produces hydrogen-rich bubbles before being introduced into the engine draft.”

 

TRUTH:  Almost all the standardized kit-form water injection devices rely on manifold vacuum pressure to pull distilled water ($1.00 or more a gallon) from a plastic container and spray it into the manifold via a vacuum line connection.  That means that the cylinders which are closer to the connection will get more misted water in the air-fuel mixture than the cylinders which are further away – causing the closer cylinders to run cooler.  Largely depending on the type and quality, the on-board computer will try to adjust the overall air-fuel mixture - resulting in increasingly mixed readings from the sensors as each adjustment alters the temperature in the combustion chamber as well as the amount of oxygen in the exhaust.  In any event, water injection devices that rely on manifold vacuum pressure instead of a pump do not pull the water from the plastic container if  the engine is at wide-open throttle – when the combustion chamber is hottest and could actually use some cooling down.  Also, almost all vehicles have elaborately cooled engines and advanced integrated water-cooling systems that ensure a constant engine temperature.  Moreover, cooling the combustion chamber also cools the operating temperature of the hot electrode of a spark plug.  If the temperature of the hot electrode drops below 600° C, deposits will form on the plug, which will rather quickly cause a small drop in horsepower and fuel economy.

 

As to the water injection type devices touted to actually be a “fuel cell hydrogen processor,” only the most stupid or insane could possibly believe that nonsense.  Dynamometer testing shows that using the standardized kit-form water injection devices which rely on manifold vacuum pressure tend to result in about a 20% drop in horsepower and fuel economy.  However, in the higher and dryer altitude regions that heat up during the daytime, vehicles equipped with more expensive high tech pump fed water injection devices (which evenly inject water vapor mist at or near the air intake portion of the air-flow system), can achieve a small increase in horsepower and fuel economy during the hotter portion of the day when towing loads, climbing hills/mountains, or driving wide-open (fast).
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