Neil, the only thing I would add to that is that on my early Hilborn,
the only thing the barrel(metering) valve does is cut the
closed-throttle fuel flow down to about (an adjustable) 10% for idling.
There may be more sophisticated barrel valves made later, but this one
has a quick opening feature so that very soon when you open the
throttle, it goes to full flow. As Willie Glass explained to me once,
"At idle, the engine runs on the barrel valve. After that, it runs on
the pill (bypass jet)". I think Stu Hilborn found out on day one that
if he tried to operate his continuous flow fuel injection without a
barrel valve, the idle mixture was ten times too rich for the engine to
run! Bill
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