nozzle per cylinder setup

[stevieturbo]

What's the best way to achieve this ?

Looking to do a nozzle per cylinder and controlled by the ecu. I assume Aquamists solenoid valve will work and flow enough for all 4 nozzles, or would more than one solenoid be required ?

Hoping for 4-500bhp on a relatively small 4 cylinder engine. Will be using water/meth, but want 4 nozzles to ensure each cylinder gets equal flow.

Just energise the pump at a preset MAP setting, and then inject liquid as required ? Probably just map water/meth flow relative to IDC for starters.

Sound sensible ?

Any other nozzle or solenoid options ?

[Richard L]

Are you intending to use an independent progressive methanol map or just trackinhg the fuel duty cycle.

If you track IDC, it woukd be easier to use 4 valves and use the existing fuel injector signal to obain full sequential spray.

[stevieturbo]

Originally Posted by Richard L

Are you intending to use an independent progressive methanol map or just trackinhg the fuel duty cycle.

If you track IDC, it woukd be easier to use 4 valves and use the existing fuel injector signal to obain full sequential spray.

Initially will probably just base water output relative to IDC just to get up and running, and see how it performs. It's for a small 1300cc engine, and hope to make some decent power, so may need to increase or decrease flow as boost/rpm rises etc

But the ecu will be in full control so I can run it's own map

At high loads, I doubt a sequential spray will offer much, if any benefit anyway ? And unless I was using another 4 injector outputs, they couldnt be timed for valve opening etc anyway.

Or were you suggesting just piggybacking the water solenoid off the injector ?

I just want more control than the typical progressive controller offers, and given intake manifold shape, I wouldnt trust a single nozzle for equal distribution of liquid.

[Richard L]

I was suggesting piggybacking four solenoid valves to each fuel injector. Most ECU can drive extra load. It will be more costly.

A single solenoid valve branches out to four nozzles will also work but need to trigger the system slightly earlier to purge any air out of the lines due to action of vacuum purging out the water inside the delivery hoses.

[stevieturbo]

Originally Posted by Richard L

I was suggesting piggybacking four solenoid valves to each fuel injector. Most ECU can drive extra load. It will be more costly.

A single solenoid valve branches out to four nozzles will also work but need to trigger the system slightly earlier to purge any air out of the lines due to action of vacuum purging out the water inside the delivery hoses.

Doing that wouldnt give me any control though as it's fixed.

I'd rather size the nozzles large at say 1mm per cylinder, and let the solenoid control actual flow. That way I can start low and add more, or visa versa.

And it will be easy to mount the solenoid close to the nozzles. But yea I would start injecting quite early to ensure it's there when it is needed. Same with powering the pump up early.

What sort of flow ability does the solenoid have ?

[Richard L]

You cannot alter the IDC% ratio but you can alter the flow ratio by sizing the jet.

Aquamist has a range if solenoid valves to handle flow between 400cc/min to 1600cc/min. Ideally, select a solenoid valve to match the fluid flow helps the linearity.

[stevieturbo]

I'd prefer not to have to mess about changing jet sizes if possible.

I think an 800cc or so should be more than adequate.

Unless using this method may affect spray pattern at the nozzles at lower flow ?

[Richard L]

A PWM valve system does not suffer much at low flow see video here

You can also see a random sequential PWM valve demonstration there.

[stevieturbo]

Looks good. I think that should work well then. A big solenoid valve and say 0.8mm-1.0mm nozzle per cylinder, lots of boost and maybe 4-500bhp

[Richard L]

There will be a great deal of flow for sure.