H2O Injection
10-20-2006, 03:26 AM
#1
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H2O Injection
What do you think injecting water into the exhaust stream pre-turbo would do?
If the droplets were less than 15 microns, and the quantity of water wasn't too much, the water molecules would flash to steam, expanding 1700 times in volume. That would have a cooling effect on the EGTs, as well as cause the drive pressure to skyrocket, which ought to raise boost pressure enough to send the cylinder head right through the hood...
If the droplets were less than 15 microns, and the quantity of water wasn't too much, the water molecules would flash to steam, expanding 1700 times in volume. That would have a cooling effect on the EGTs, as well as cause the drive pressure to skyrocket, which ought to raise boost pressure enough to send the cylinder head right through the hood...
10-20-2006, 09:39 AM
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In twins setups.....a very small nozzle between the turbos, a small nozzle on just before the intercooler and a couple of biggies on the intake manifold will give you amazing results. The water is being injected at 120 to 220psi and the nozzles are making the droplets very small so the jump to water vapor does not blow anything up....don't you guys have a kettle....I just made tea and the house is still standing.
Too much water and you just quench out the fire. You need heat to combust diesel...To much water no heat. ks
Too much water and you just quench out the fire. You need heat to combust diesel...To much water no heat. ks
10-20-2006, 10:03 AM
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In twins setups.....a very small nozzle between the turbos, a small nozzle on just before the intercooler and a couple of biggies on the intake manifold will give you amazing results. The water is being injected at 120 to 220psi and the nozzles are making the droplets very small so the jump to water vapor does not blow anything up....don't you guys have a kettle....I just made tea and the house is still standing. Too much water and you just quench out the fire. You need heat to combust diesel...To much water no heat. ks
Too much water and you just quench out the fire. You need heat to combust diesel...To much water no heat. ksYeah I have a kettle and it is a poor comparison. Read what he was asking...he was inquiring about injecting water into the exhaust stream before the turbo.
10-20-2006, 11:39 AM
#7
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That's great info Kerry - I'd thought about injecting before the intercooler but not between twins (probably cause I just have ONE 
)
I'm building my own water/meth injection for the intake manifold, I'm just considering the extra "features" I might design into it... I wouldn't expect the turbo to survive without a BOV, and it probably wouldn't pump all of that air anyhow.
Some of the military jet engines have used water injection to increase thrust out of the turbine, because of the huge expansion during the water molecules' phase change. I.E. - if one cc of water flashed to steam every second in the exhaust manifold, 1.7L of extra "volume" would be present, and since the internal volume of the exhaust manifold is fixed - then drive pressure has to rise, right? As a side benefit, the latent heat of evaporation during the phase change would certainly have a cooling effect on the EGTs.
The scheme has numerous practical potential applications... such as instant high-pressure boost with large hard-to-spool turbos.
)I'm building my own water/meth injection for the intake manifold, I'm just considering the extra "features" I might design into it... I wouldn't expect the turbo to survive without a BOV, and it probably wouldn't pump all of that air anyhow.
Some of the military jet engines have used water injection to increase thrust out of the turbine, because of the huge expansion during the water molecules' phase change. I.E. - if one cc of water flashed to steam every second in the exhaust manifold, 1.7L of extra "volume" would be present, and since the internal volume of the exhaust manifold is fixed - then drive pressure has to rise, right? As a side benefit, the latent heat of evaporation during the phase change would certainly have a cooling effect on the EGTs.
The scheme has numerous practical potential applications... such as instant high-pressure boost with large hard-to-spool turbos.
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10-20-2006, 11:43 AM
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D - I don't think there's a downside to water/meth injection, and if I wasn't building my own, I'd buy one from Snow Performance. Just get a big enough tank if you're gonna tow with it! (See - now I gave you another idea for another custom tank 
)
)
10-20-2006, 11:50 AM
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). So my custom tank will actually be two tanks in one.
10-20-2006, 11:55 AM
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Good idea - my bed is already filled with boxes, so I'm fabbing up a 304SS tank to fit under the bed where the muffler used to be. If you end up running stacks - don't forget about all the real estate you'll gain on the bottom! 
10-20-2006, 11:59 AM
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MikeyB
10-20-2006, 12:41 PM
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But then you won't be able to slide things underneath the toolbox to use your whole bed...
look under your bed - it wouldn't be too hard to get a 5 or 10 gallon cylinder down there
look under your bed - it wouldn't be too hard to get a 5 or 10 gallon cylinder down there
10-20-2006, 12:43 PM
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10-20-2006, 04:45 PM
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Water in the exhaust.....Yikes that would be too cool....You do it first and if it works for you I'm right behind you. It sounds like it would be a shaft snapper though....Exhaust side of the shaft would have a sudden surge of air in without the corresponding increase in RPM to allow more air in the engine. I think I would want 14mm studs, firerings, and the truck to be on the engine dyno....not on the street. ks
10-20-2006, 06:26 PM
#15
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I'd think the sudden rise in drive pressure would immediately spin up the turbine, which would cause the impeller to stuff lots of air into the cylinders RIGHT NOW.
I bet the turbo would need a stout shaft, but it doesn't have to be set on "kill" - 45 psi at the flip of a switch would be awesome.
I bet the turbo would need a stout shaft, but it doesn't have to be set on "kill" - 45 psi at the flip of a switch would be awesome.