Richard,
Re test ? you welcome. I will do few more to double-check. If you will do the same test at some stage it will be interesting to compare.
Re HSV ? thanks for the info about the driver. I will keep it in mind.
I shall comeback to the drawing board and test bench. Progress is slow as I doing these off-work hours. And there is a lot to be tested and calculated. I seem to like the idea of varying pump pressure, I may use it in conjunction with HSV. I am now waiting for samples of pressure transducers and flow meters.
More I look in to it more I realize I am trying to copy fuel injection system?
:roll:
Just found this NASIOC forum. This is a HOT topick you run Richard
The general public need to sit down with pencil and do some calculations - they will eventially see what you are trying to tell. I guess i went thru the same process

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