Aquamist 2s solenoid and FIA2

[gilbertg]

Will the FIA2 drive the solenoid on the Aquamist 2s manifold correctly?

[Forum Admin]

Good question, but I think it could.

[Brad]

The modulating valve of the 2s will not operate at a high enough frequency. The 2s valve opereates rather slow. The FIA2 will drive at the same rate as the fuel injector, too fast for modulating of 2s.

[gilbertg]

Thanks Folks, I'll order a (806 244) High speed stainless inline valve: 4mm qck-fit 12v. Is there anything else I will need to be able to connect the HSV?
Thanks,
Giles

[gilbertg]

Brad,
Do you know the solenoid specs for the inline valve in the 2S system? It is possible that I may be able to drive that directly from my EMS and gain the control that I need without the need for the HSV.

[Brad]

Solenoid respond time
on 4.5ms
off 2.3ms
It is slow. On my data logger you can see the cycles of off and on. A high speed valve will work just like a fuel injector. Except for the expense of the high speed valve it is the best route to be driven with an EM system.

[gilbertg]

Do you know the operating frequency of the solenoid?

[gilbertg]

Given the above response times the maximum operating frequency is 150Hz. Brad, if you can measure the frequency the MF2 uses from your logs that would be great.

[gilbertg]

In the Fuel Injection sectio of the MF2 documentation I found the following:

Injection Pulse Duration:
Fuel = 12ms (typ.)
Water = 35ms (type.)

Injection Width: 5% to 90%

The above data equates to an operating frequency of:
Fuel = 83 Hz
Water = 29 Hz

so, anyone wishing to drive the manifold (#806-200) solenoid (#806-218) from an EMS should set the pulse width to 35ms or operating frequency to 29Hz. 2-way inline valve (#806-234) should be the same.

[gilbertg]

From Richard Lamb @ ERL (Aquamist):

'The valve can be driven with a maximum frequency of approximately 30Hz, 12V supply. The drive signal can be pulse width modulated.'