[Diy_efi] water injection

ian spyro
Thu Sep 6 13:38:24 UTC 2007

On Thu, 2007-09-06 at 11:28 +0800, Mike wrote:
> A good type of water injection system is one in which chilled water is
> constantly circulated
> through the piping at above manifold pressure much like the fuel
> return system in a gasoline EFI engine.

Yes, I considered that as I dont want heat soak warming up the
(relatively) slow moving water in the piping.

for initial testing, though, Im going to skip that and go for direct
feed and a fairly narrow (but thick) pipe.

>  ie Have the spray solenoid off a 'T' junction close to the atomiser
> so the system
> has minimal delay to spray as soon as a preset level of boost is
> present etc...

thats for later :)

> PWM of the water pump might be ok but you really need to develop
> enough pressure at the
> nozzle early on to ensure you get consistent droplet size regardless
> of flowrate, it would be
> ideal if there were a PWM solenoid atomiser with a 'T' feed for all
> the reasons described,

one idea I may try is a piezo 'fogger'

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