Since discarding my I/C water spray -See my post in general - I am considering modifying the current spray system so that it induces a fine mist directly into the inlet manifold.
Does any member know if this modification requires drilling into the manifold or is there another way which is not so radical?

 

Your water spray pump does not provide enough pressure to correctly operate as a water injection pump..

You need about 5+ BAR to correctly inject and atomise the water.

You also need to use the correct design and flow of water injection nozzle.

If you do need WI, then buy a proper kit, using a home made kit for this sort of purpose is very dangerous to the engine

Are you sure you need WI ?

J.

 

Rob,

Saw your other post, and I'm surprised you had to pay for the repairs.

What you're talking about doing, is water injecting the car. This is FAR more complicated than just sticking a jet in the inlet manifold.

First of all, the jets used for IC water spray are very crude, and their ability to "mist" the water (for WI purposes) totally inadequate.

Next, the standard "spray" pump, isn't very high pressure, and when you take into account the manifold pressure (what ever boost you run) it will be working against, it's doubtful you'll get much misting at all.

If you decide to play with different pumps, you'll need to work out how much water is actually being supplied. Too much, and you will lose loads of power. Depending on how much boost you run, and if you have a mappable ecu, I'd aim for between 150~175ml pm.

I'd suggest either modifying the gearbox gater, of getting the ERL water injection system.

Mark.