G'day Norm,
Originally Posted by NormK
My belief with the restrictor is not that it slows the suction down, what it is doing is slowing down the rate that the compression with the piston coming up can push the valve closed, that slight delay allows the piston to go over the top on the first rotation and by the second rotation it has enough momentum
Well,sort of! cool

The main point here is, that having that 'restrictor orifice' in the system, is going to slow down the speed of movement of the poppet valve, in both directions.

Cheers,
Gadge

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