I have been running a single solenoid with a progresive controler and rpm switch on a NA aplication for some time with no product problems but poor performance.
The performance problem is as rpm rises need more alk/ water.
Also there is no lag time with NA engines - mash the throttle you need instant injection - almost a alk/water acelerator pump shot is needed.
Solution - added two rpm swithes and 2 solenoid valves 2 nozzels trigggered at 1800rpm and 3600 rpm
Also added a push button, solenoid valve and relay to inject a shot before mashing the pedal.
It works well on the car acording to the wide band and lack of detonation.
But when bench tested the non triggered solenoid valves leak by when the pump runs and only one stage is activated.
Is this normal? Was the solenoid valve made only to hold back vacum not to isolate stages from a running pump?
Also what direction is the valve to be installed?
I have not taken one of these valves apart but from other valves I have taken apart there is a peferred direction for flow as pertaining to needle seat arangement, and for assistaning sealing under pressure oposed to lifiting the needle off it seat.
A side note the " new revised
check valve" that you sent me seems to work fine on the bench but I have not run it on the car. I am glad to see you are continually improving your products.