Theory behind water injection?
#1
Not a rotor? Not a motor.
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Theory behind water injection?
Just curious as to what exactly water injection does?
I may sound like a noob, but i've heard of people adding water injection systems to their engines and i just sorta wondered how exactly it increased performance..
I may sound like a noob, but i've heard of people adding water injection systems to their engines and i just sorta wondered how exactly it increased performance..
#4
Banned. I got OWNED!!!
"The main function of these systems is to suppress detonation caused by high temperature and pressure developed within the combustion chamber when the effective compression ratio has been taken beyond the auto-ignition point by either a turbo or a supercharger."
"A turbocharger essentially compresses the air going into the engine in order to force more air than it would be possible using the atmospheric pressure. More air into the engine means, automatically, that more fuel has to be injected in order to maintain the appropriate stoichiometric value of the air/fuel ratio (around 14:1). More air and fuel into the engine leads to more power. However by compressing the inlet air the turbocharger also heats it. Higher air temperatures lead to thinner air and therefore an altered stoichiometric ratio which results to richer mixtures. Over-heated air intake temperatures can cause detonation.
Detonation, an effect also known as engine knock or pinging, occurs when the air/fuel mixture ignites prematurely or burns incorrectly. In normal engine operation the flame front travels from the spark plug across the cylinder in a predefined pattern. Peak chamber pressure occurs at around 12 degrees after TDC and the piston is pushed down the bore."
Yay for Google.com....
"A turbocharger essentially compresses the air going into the engine in order to force more air than it would be possible using the atmospheric pressure. More air into the engine means, automatically, that more fuel has to be injected in order to maintain the appropriate stoichiometric value of the air/fuel ratio (around 14:1). More air and fuel into the engine leads to more power. However by compressing the inlet air the turbocharger also heats it. Higher air temperatures lead to thinner air and therefore an altered stoichiometric ratio which results to richer mixtures. Over-heated air intake temperatures can cause detonation.
Detonation, an effect also known as engine knock or pinging, occurs when the air/fuel mixture ignites prematurely or burns incorrectly. In normal engine operation the flame front travels from the spark plug across the cylinder in a predefined pattern. Peak chamber pressure occurs at around 12 degrees after TDC and the piston is pushed down the bore."
Yay for Google.com....
#5
King of the Loop
Originally Posted by Denholm
Just curious as to what exactly water injection does?
I may sound like a noob, but i've heard of people adding water injection systems to their engines and i just sorta wondered how exactly it increased performance..
I may sound like a noob, but i've heard of people adding water injection systems to their engines and i just sorta wondered how exactly it increased performance..
The system is usually run with water and or alcohol.
It also adds to the octane of the fuel being burned and allows people to run much higher boost on street gas. For example rather than needing c16 to run 22lbs, one may be able to run 22lbs on 93 octane + methanol injection.
In the end it just protection against detonation. Cooler/denser air.
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#8
Originally Posted by rs_1101
also, in theory, water vaporizing into steam would increase pressure in the combusion area, causing a power increase and a cleaner burn
Last edited by BLitzed33; 08-09-06 at 10:08 PM.
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Originally Posted by DerangedHermit
"The main function of these systems is to suppress detonation caused by high temperature and pressure developed within the combustion chamber when the effective compression ratio has been taken beyond the auto-ignition point by either a turbo or a supercharger."
"A turbocharger essentially compresses the air going into the engine in order to force more air than it would be possible using the atmospheric pressure. More air into the engine means, automatically, that more fuel has to be injected in order to maintain the appropriate stoichiometric value of the air/fuel ratio (around 14:1). More air and fuel into the engine leads to more power. However by compressing the inlet air the turbocharger also heats it. Higher air temperatures lead to thinner air and therefore an altered stoichiometric ratio which results to richer mixtures. Over-heated air intake temperatures can cause detonation.
Detonation, an effect also known as engine knock or pinging, occurs when the air/fuel mixture ignites prematurely or burns incorrectly. In normal engine operation the flame front travels from the spark plug across the cylinder in a predefined pattern. Peak chamber pressure occurs at around 12 degrees after TDC and the piston is pushed down the bore."
Yay for Google.com....
"A turbocharger essentially compresses the air going into the engine in order to force more air than it would be possible using the atmospheric pressure. More air into the engine means, automatically, that more fuel has to be injected in order to maintain the appropriate stoichiometric value of the air/fuel ratio (around 14:1). More air and fuel into the engine leads to more power. However by compressing the inlet air the turbocharger also heats it. Higher air temperatures lead to thinner air and therefore an altered stoichiometric ratio which results to richer mixtures. Over-heated air intake temperatures can cause detonation.
Detonation, an effect also known as engine knock or pinging, occurs when the air/fuel mixture ignites prematurely or burns incorrectly. In normal engine operation the flame front travels from the spark plug across the cylinder in a predefined pattern. Peak chamber pressure occurs at around 12 degrees after TDC and the piston is pushed down the bore."
Yay for Google.com....
"Detonation, an effect also known as engine knock or pinging, occurs when the air/fuel mixture ignites prematurely or burns incorrectly." This is wrong. Premature ignition is a condition known as "preignition," and is completely seperate from "detonation." Detonation is purely a case of multiple flame fronts occuring at different times in the cylinder once the spark has occured. Usually the cause of detonation is a non-homogenous air/fuel mixture in different parts of the combustion chamber (I guess you could call it "stratification?"). This is why quench pads work so well: they squeeze the air/fuel mix from the hard to reach outside areas of the cylinder towards the center where it can ignite consistently.
Water injection not only cools down the cylinders, but the expansion to steam provides additional force on the crank, and the water actually facillitates combustion. If you want to know more than this, do some research yourself at www.waterinjection.info.
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