Brad,
beginning to understand this all now thanks. One more question: If im pulsing water then surely the air will go hot - cold - hot - cold? Thats why I assumed it best to adjust flow rather than pulse. I take it this isnt the case?
Phil

The cycle at which the valve cycles is very fast and does not create the issue you discribe. The tuneablity of using pulse width is much more usefull than a constant flow.

Brad,
Thanks for your help
Phil :)

Phlip hi,
Tell me something what ECU are you using on your project.

U seem to have a pretty awsome ride there and the guys in this forum are quite helpfull keep it up guys ..!

Hi,
its a Megasquirt ECU, you build it yourself and make it fit your application. Sounds harder than it is, there are hundreds of people doing it all over the world now thanks to their forum, who have no experience with electronics or engines. I knew next to nothing about engine management before I started, still dont know a lot, but the engine runs so much better than before.
All the details are on my site, dont be put off if you feel you wont be able to do it as there is a great deal of help from the forum and Ive not heared of anyone not getting there eventually,
Phil
http://www.replica-cobra.co.uk