Hi Paul

Steve Izett - Perth, Western Australia.
Thanks heaps for the list.

I'm building Glasair Super II.
My 4 port Renesis has just arrived and after doing some preliminary
measurements (thrust line to top of cowl very limited) I'm pondering the
pro's and con's of plugs up.

It would appear that by using plugs up orientation I could leave intake
manifold and injectors (less some weight reducing measures), cooling
(thermostat housing etc.), and alternator location as is.

I figure Mazda spent a lot of money getting things right so want to be
wise with what I play with.
Can you comment, particularly on oiling and pan considerations?

Many thanks

Steve Izett

The oil drain backs and steam vapor accumulation in the rotor
housing are a serious problem. My recommendation is
don't do it. The stock intake manifold is useless for aircraft
use as its entire justification is high torque at 2000 to
5000 RPM range.  A range where the aircraft engine has no
load to speak of.