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On 25 Jul 2004 at 21:03, Keith Park wrote: > If the pump has a different flow rate, or can produce more or less > pressure... wouldnt that change the orifice size needed to keep the > pressure at 30? Increasing the pressure/flow in the regulator has the effect of increasing the orifice size, just by virtue of the movement of the diaphram. The change in pressure would be dependent on the spring constant of the spring behind the diaphram. I think that spring's pretty long compared to its range of motion in use, so I'm guessing that the pressure wouldn't vary much. For comparison, consider what happens when our FI engines use lots vs. little fuel. The flow thru the regulator changes in response to this, but we can't see any change in pressure. Of course at some point the whole regulator could be overwhelmed due to the size of it's central pipe, but at that point adjusting the screw won't make any difference any more. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Shameless link for search engines: http://listarchive.type3.org ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~