Using IDFs As Water Injectors

[cal 67]

I was thinking of using a pair of IDFs as throttle bodies/water injectors on top of dellorto style manifolds with injector bosses. I don't know too much yet about the water/fuel ratio yet but I was thinking if I jetted a pair waay down that it would possibly work. The parts I was unsure about were:

1. How would I adapt a throttle position sensor?

2. Would I have to mix water with something else to stop any corrosion in the carbs?

3. What's available as far as injectors, brains, and harnesses that
I could adapt?

4. Would it work??!!

[Bruce Tweddle]

2. Yes

4. Why do you want to dump water into your engine?

[cal 67]

Dump? Well I thought if I could use a really small main jet, the carbs would deliver the proper amount water to fuel and air to allow me to get away with more compression on 87 octane in my mileage engine.

[Bruce Tweddle]

you can call me a heathen, but it doesn't work.
Dumping water down the intake just puts out the fire.  It absorbs the heat that would otherwise push the piston down.  IOW, you make a lot less hp.

[madoski]

Dump? Well I thought if I could use a really small main jet, the carbs would deliver the proper amount water to fuel and air to allow me to get away with more compression on 87 octane in my mileage engine.

It might, but you probably would need some adjustability for it to really work right (i.e. adjustable boost on turbo and EFI).  If you like to tinker, why not try injecting water into the air cleaner with an atomizer of some sort?  The trick is to get as fine of a mist as possible without having to spend a lot of money on a high pressure pump.  Also, consider playing with a water/alcohol mixture...I think that's the way it's usually done.  Good luck, nothing ventured, nothing gained!

[martin]

I found out more info on this interesting topic:
Bruce is right about 'putting out the fire' but what that means is less detonation allowing higher compression and more efficient combustion with less fuel. The next thing that happens is that the steam compresses and expands as the piston moves down creating higher pressure. It is easy on engines, increases fuel economy, and helps the engine run cooler. Windshield washer fluid (50/50 methanol mix) should be used. Having an ecu control the flow is ideal.