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Joe,
it can matter if the "OUT" is pointing down.
Depending on the cooler design you might have a compressed air cushion on
top of the oil crossflow.
That's one I hadn't figured would be an issue - and yes, my "Out" is
currently on the bottom.
So, tonight I'll checkout the thermostat and put it back in (unless I can
figure a way out to block off the bypass at least for testing). I'll also
re-fabricate the oil lines so I can hookup the "In" hose to the bottom port
and the "Out" host to the top port (which is actually the real "Out"
anyway!).
Thanx,
Joe Hull
Cozy Mk-IV #991 (In Phase1 Flight Test - 29.1 hrs flown)
Redmond (Seattle), Washington
It will depend on, if your cooler is "serpentine style" (one tube meandering
back and forth through the cooling fins) or a "tank style" (collector tanks
on both sides and multiple cross tubes).
Serpentine doesn't allow air-cushions (Think shower-hose) No matter if the
water goes up or down the hose, any air is purged out with the flow.
With end-tanks, the flow-speed comes way down in the cooler and may allow
air to ocuppy the upper few cross tubes, reducing the effective cooling area
as the oil goes through the lower tubes.
If you have the "OUT" on top it will push the air out into the engine, no
matter what...
Thomas
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