Hay all, i used one of those flowmeter for tig welders and it dosn't work, they are to small for the job. Instead of gas i used compressed air, its safer to use at 1.6 bar pressure, the same as the system uses.
I found some data regarding lpg injectors and it says: flow 32 to 93 cc at 2.5 bar. Openingtime 24 ms. see this site. 


KEIHIN LPG CNG Injectors Comparision Chart
Colour 	Flow Rate (cc/stroke) 	HP Range per Cylinder  	kW Range per Cylinder 
Green 	32 cc 	  	 
White 	42 cc 	15 - 20 HP 	9 - 15 kW
Blue 	52 cc 	17 - 27 HP 	13 - 20 kW
Orange 	63 cc 	24 - 36 HP 	18 - 27 kW
Yellow 	73 cc 	34 - 47 HP 	25 - 35 kW
Brown 	100 cc 	42 - 60 HP 	31 - 45 kW




The GSA has a peak horsepower output of 64 HP @ 5,500 RPM. Maximum torque available is 69 ft-lbs @ 3,500 RPM.