Al Gietzen wrote:

Dave Atkins claims the apex seal oil metering system does not work over
8000 feet.

(snip)

If it be true, then that is a bit of a critical piece of information.  But
'why'? The driving force for the metering system oil flow (as best I can
figure out) is the pressure differential between the ambient atmospheric and
the pressure in the combustion chamber during the intake cycle.  This would
suggest that for a NA engine there would always be some pressure to drive
the flow.

 And it is consistent that the metering control lever should be at lowest
flow for closed throttle position (greatest pressure differential), and
highest flow position for open throttle position (lowest pressure
differential).  I'd guess there is the presumption that the lubrication
requirement is only a function of RPM, and not power output, and the
metering control level is for compensation of the changes in pressure
differential.

 There seems to also be some uncertainty on which way the spring on the
metering pump forces the control - to 'high' position, or to 'low' position.
Which is it?

Al

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