> Perry,

>    Clarification? Do you mean your throttle-body is spring loaded to

> to wide open if disconnected or were you refering to the metering

> pump which in stock cofiguration is spring loaded to the closed

> position if disconnected?

>

> Kelly Troyer

Sorry about that. The springs on the throttle body force the throttle

closed, so I had to reverse those. If my throttle cable breaks, throttle

goes wide open.

 

The spring on the oil metering pump itself forces the pump "full on" if the

linkage is removed between the throttle and the oil metering pump.

 

It is my understanding (from David Atkins) is that the spring on the metering pump forces the control to ‘Low’ position.  Since this is a critcal issue if relying upon the metered system for seal lubrication I (we) would be forever grateful if someone would verify which way is which.

 

On a related subject, a posting on the ACRE list follows:

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

8000 feet. He also claims the engine will run up to three months in automotive service with no apex seal oil whatsoever. We have some verification of that as George Graham flew his airplane from Tennessee to New York state while forgetting to mix two cycle oil with the fuel.

 

If it be true, then that also 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.

 

Al