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Fuel injection systems

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Roger B:
The 4mm part is still moving so it will displace the same amount of fuel. Does your 2mm pump work without any pressure? Does it deliver the amount of fuel you would expect? Are you using ball valves? The movement of the ball must be very small with small volumes otherwise it takes too long to reseat.

Minh Thanh:
Roger !
 I drew it wrong,
this is correct, I'm sorry
 I use ball valve
 amount of fuel :  i think it's fine, but the pressure is weak,     
with a 4mm cylinder, I can be sure it's fine, but with a 2mm cylinder I'm not sure

Minh Thanh:
   And one more thought:
I use a 4mm cylinder, but I increase the spring force of the needle
  the needle will open when the pressure is at a higher pressure range, This results in less fuel being injected
  This video is I tried with the above method, the stroke is about 0.8 mm
  (that injector is not very good)
  what do you think ?
  http://www.youtube.com/watch?v=EkhVRjVBeHA

Minh Thanh:
Hi All !
It lives,
although still need to improve, but that's what i need right now

 http://www.youtube.com/watch?v=AZVPeWOeT5Y

cnr6400:
 :ThumbsUp: :ThumbsUp: :ThumbsUp: well done!  :cheers:

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