Greetings all again.

I'm having problems with a well made NVA which has TWO holes in the spraybar.
Testing has shown on one of my engines , it ran much smoother and was easier to set with a traditional ST NVA with a single hole.

So guys ...... Why have TWO holes please ?
And ....... Which is better ?

Much obliged ,

Robin.

  In my opinion, neither is "best"   either one, positioned in the venturi properly will perform the same.  The problem usually lies in the needle fit in the spray bar rather than the one or two hole configuration.  I have taken single hole spray bars, and drilled through them to give two hole types as well as enlarging the single hole.  I also have soldered shut one hole on the two hole versions .  I have not found ANY noticable difference in performance in ANY of the configurations.  I believe it is probably the Manufacturers'  perogative.  Proper positioning of the hole(s) within the venturi throat  both laterally as well as rotation positioning is more important than the number of holes within the bar itsself.

   Bigiron

Marvin,

Good to "see" that you are typing again--------two hands, now???

Best Regards,
Jim

  Two fingers partially.  Hand is quite swollen today, but is slowly improving (I think)

Some two hole ones, the holes arnt at 180 Deg. ( there say 165 ) and want to be downish rather than upish
regarding the intake flow.

I flew my Fox 35.  It ran fine. Looked in the venturi and the single hole on the ST NVA was looking out at me.  Now, I wonder, does this mean the position of the hole is not important on a Fox 35, or does it mean that my Fox 35 ordinarily runs pretty crappy and I just think it is running fine?