I have the 8v sohc 8 spark plug head from the ca20 and wondering if anyone has seen the sparkplug like direct fuel/diesel injectors anywhere and if I could perhaps use them as water injectors?.




Im thinking of injecting water directly into the chamber during the inlet stroke.

ideally Id like to run a fully programmable ignition system to make use of a second
power pulse by injecting the water just before the end of the exhaust stroke but knowing
how much to inject to make use of the 1800% expansion rate is beyond my budget.
However the dual spark plug heads have some potential.

If so I could setup the water inj on the exhaust side sparkplug bosses.

Attach file:

---

  twinspark.jpg (171.58 KB)

Almost definitely you _won't_ be able to use them. Some diesel injectors are (well, relatively speaking) very fickle and don't tolerate solvents particularly well. They additionally are made to run at exceptionally high pressures (lets not forget they inject diesel into a cylinder at or about TDC after it has compressed air 20+ times with typical diesel comp ratios (so it's fighting against an in cylinder pressure of 300 odd psi, then even higher cylinder pressure as the first part of the injected fuel burns before the tail end is fed into the cylinder. Meaning you'd need a high pressure pump/lines to get it to have a great spray pattern (and imho, it still won't suit it at all pattern wise). Water would lead to it corroding/failing soon enough..

If you want to run water injection through more conventional efi type injectors, then there are a few options. Probably the best I can think of off the top of my head would be some model mercedes (and I can find out which if anyone is interested) used injectors with a stainless steel pintle, and are therefore theoretically ok to run with water without major corrosion stuffing them in a few weeks. I think i recall on performance forums someone actually running them, and I forget precisely, but they got something like a year of consistent use out of them before they started to stuff up.

Given teh fact you can get agricultural spraying nozzles which won't corrode, for literally change out of a 50 (including the piping to adapt/mount it on the intake) they are stll the way to go imho (as far as budget minded people are concerned, and I'm always in that category!) You can get tiny inline mesh screens for them too, so they won't clog or damage the nozzle, and additionally you can get small inline one way/pressure valves so they only allow flow in one direction (

That means you can't get reverse flow under boost if the pump wasn't on, lets say you have two boost settings, 5 and 10psi. 5psi is fine no water. But you need water for 10psi running. well with no one way valve, at 5psi with the pump off, the water injection hose/nozzle would be pushed back and filled with air from the intake, meaning when you did switch it back to higher boost, it wouldn't get water straight away. Additionally, the pressure relief valve is also in there, and it stops flow when water pressure drops below about 5psi. This is very handy, because on something like a drawthrough setup, where you have the water injected after the carby, but before the turbo or supercharger, thre's high vac in that section of intake tract at part throttle, and without this valve, the high vac would be enough to suck water in through the line. There'd be sufficient pressure differential to do it.