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John Deere GP

My understanding is that the water injection simply increases the octane rating of the fuel (higher octane means harder to burn, water is very hard to burn). By doing this, it preventing the "knocking" of pre-ignition.

One must keep in mind that even low-grade modern gasoline is far better than any premium gas available back when these tractors were built.
 
Water injection does not increase octane and it does not increase compression. It works by cooling the incoming air/fuel charge to prevent detonation. Whenever water turns from liquid to vapor, the temperature drops and when you have the temperature drop, you have less chance of detonation.
One way to visually see this as a human is to have somebody take an alcohol-soaked washcloth and rub this on your back. As the alcohol quickly evaporates, your back feels cold.
 
Much better description. I just knew it prevented detonation of low-octane fuels. As I recall, it takes the water directly from the cooling system?
 
Usually from an external source or container. Remember that water injection ALLOWS a person to have higher compression or increased combustion pressure, it does not (in itself) give higher compression or increased timing.
 

The water injection was only for keeping the Carbon Deposits from building up in the combustion chamber and on the valves..which would cause an increase of compression and cause detonation...

Ever De-Carbon an engine by Pouring a Glass of water down the carburetor of a Hot, fast-idling gasoline engine..??
Works Great..!!

Ron..
 
Hey there;
Didn"t they use "water injection" in WWII fighter aircraft,
to increase horsepower,or performance??
It seems that I"ve, heard of it.
Bob
God Bless
 
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