Yaro:
Another question, how fast is current to fully power solenoid? 30-50ms or it's comprensive of stroke movement?
It's a function of the induction value of the solenoid coil. Recall the old ELI the ICE man rule, (voltage E leads current I in an inductive reactive circuit, current I leads voltage E in a capacitance reactive circuit), so the higher the inductive value the 'slower' the coil is to respond. But this time probably pails in the 'speed' on having to move the mass of the plunger assembly.