Fuel injector for water injection?

[TygerTung]

ME and my friend are looking to install water injection on our cars, and my friend has some 20 Vlave 4A-GE injectors lying around from when he made his quad throttle manifold, now would one of these small injectors be suitable as a jet for water injection?

Would a windscreen washer pump be just the ticket for pumping the water?

Cheers,

Sam.

[CozmoNz]

Id check the flow on a water injection unit injector.

im told you need SWEET FK ALL water in there, so injectors will probbaly flood the thing, you dont want another 25% water to fuel do ya

gotta be careful with that though, to much water and u just fuked ur rod

and will a windscreen washer pump be able to flow 290cc of water? (is that the flow of 20v injectors?), because it will need to be able to get that flow up or it will dribble the thing in... i doubt it since window washer pumps are just *spit it out* and dont require a set pressure.

[Malcolm]

windscreen washer pumps wouldn't be able to provide enough pressure. Also, if you wanted to use a 20V injector you probably could, but you would need something to control it, rather than connecting it at 100% duty cycle. Jaycar sell a kit that will pulse an injector at a preset duty cycle, which would allow you to alter the amount of water that was injected.

[GT4 20]

A 'proper' water injection system pump will run at around 100psi. I forget exactly how much, but the pump needs to run at x psi above boost to be effective. Probably something like at least 60psi. A windscreen washer pump would be next to useless. All that would happen is the boost pressure would work against the pump and you'll probably end up with reverse flow!
I doubt if an injector will be any good either. The water must be properly atomised in the intake system and at the correct amount. You'll probably need a 0.4 or a 0.5mm nozzle jet for starters (depending on boost level). If you don't get the set up right, all you'll do is dump copious amounts of water into the induction system which will simply act as a fire extinguisher. The same effect will happend if the water is not atomised correctly.
As above, a dyno set up is a must to ensure you aren't putting in too much/too little water.
Try searching on the net for a proper set up. I know they aren't cheap compared with your idea, but at least they work as they are desinged too.
http://www.aquamist.co.uk for example has some extremely interesting information about water injection in general. They also make very good kits. I currently have one on my Rover and will be fitting one to by GT-Four in the near future.
Gary

[FLAWLES]

and doesnt have to be a realy fine mist????

but y piss arse around making one when theres kit avalaible of the shelf like aquamist

but they would only be good or affective if you are running high boost or boarder lineing on detonation

correct me if im wrong

[GT4 20]

gotta be careful with that though, to much water and u just fuked ur rod

Not with that set-up you won't. You're talking about fluid lock. You'd need to fill a cylinder up with fluid to bend a rod as water etc isn't compressible. Bit like having a cold air pick-up underneath the car (which feeds directly into the intake manifold) and then driving through a deep pool of water. Unless you connect a hosepipe up to the manifold, you won't have to worry. As I said in my post above, all you'll need to worry about is putting in excessive water due to its fire extinguishing properties - you'll just lose power.
Gary

[edwagon]

Ive also heard that water will corode the insides of a fuel injector very quickly, making them unsuitable for water injection systems. I have no idea how quickly or how much effect it would have, could be true, could have been someone being a bit anal.
I think the book "21st century performance" has some good info on diy water injection

[matt dunn]

Water injection needs to be a very very fine mist or else it will be a waste of time and may cause damage.
Thats why the aqua mist pumps are so expensive cause they are such high pressure and have such a small jet. I think they are way more than 100psi.

Matt

[solberg Fan]

Ive also heard that water will corode the insides of a fuel injector very quickly, making them unsuitable for water injection systems. I have no idea how quickly or how much effect it would have, could be true, could have been someone being a bit anal.
I think the book "21st century performance" has some good info on diy water injection

Ive got that book right here.
Quote:Note that a normal fuel injector.... can not be used in a water injection system. ... will corrode rapidly.

[Malcolm]

there is a company/brand in the US that a lot of guys use for DIY water injection pumps called SurFlow, still pricey but not as pricey as Aquamist/ERL