Water Injection
#1
Registered User
Thread Starter
Water Injection
What are the reasons that one would desire water injection??
#2
Registered User
Water injection cools the intake charge. Cooler intake charge=lower egts. It doesn't really add power, but since the intake charge is cooler, it's also more dense which creates a better burn. H2O injection is the poor mans intercooler, with the advantage that it's slelectable. Plus, you can drop a bit of meth in there for fun, on occasion.
#3
Adminstrator-ess
Actually it works best if you drop some meth in there all the time. A small (20 - 25%) dose of methanol keeps the water from putting out the fire in the cylinders and allows you to run more volume of water/meth mix than you could have with straight water. This leads to greater EGT reductions than water alone.
#4
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Thread Starter
I am assuming this injection takes place in the air intake between the turbo and intake manifold, right??
#6
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Thread Starter
Is this water switchable on demand??
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#9
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Join Date: May 2004
Location: Golden, Colorado
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I would think that you would have a master switch to turn the system on and then you would have a pressure switch in the manifold to only turn the pump on once you get to a certain boost pressure. You don't want to inject water at say idle or low boost. You could possibly hydrolock the engine which could be very very bad.
#10
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Right. A master switch arms the system, and the injection is triggered by a pressure switch or a controller, depending on how expensive the system is.
#11
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Thread Starter
How big would the water/methanol reservoir need be for 1000 mile trips??
I have 92 gallon fuel capacity and often don't let my feet touch the ground until it is close to empty.
I have 92 gallon fuel capacity and often don't let my feet touch the ground until it is close to empty.
#12
Adminstrator-ess
That would depend on the terrain and the type of load. If you're towing I think you ought to have close to 10 gallons available.
This isn't a system that runs constantly, most are set up to kick on between 18-25psi of boost.
This isn't a system that runs constantly, most are set up to kick on between 18-25psi of boost.
#13
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Thread Starter
I guess freezing weather would negate the feasibility of this and probably the need. Am I right??
#14
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For reference, some windshield washer fluid is very similar to a 25% meth 75% water mix. This also happens to be a good accepted daily driver/towing mix. If the washer fluid doesn't freeze, neither will the H2O-meth mixture. Running straight water, yeah, you're SOL, but as Wannadiesel said, a bit of meth is almost needed to help keep the fire lit. Some folks actually run straight washer fluid.
#15
I run 20% ethynol in mine, mainly because methynol is hard to find and auto stores rarely carry the higher mixes of washer fluid. But i never run washer fluid, im not a fan of pouring a high detergent soap into my engine.
My system has a master switch and the primary is activated at 10 psi of boost, the boost switch can be bypassed with a selective voltage switch (tps kinda)
My system has a master switch and the primary is activated at 10 psi of boost, the boost switch can be bypassed with a selective voltage switch (tps kinda)