Paul,
How does an inverted oiling system work? What are the components involved?
--
Blake C. Lewis
RV8 N698RV reserved
Nobody has really done any R&D on a sustained inverted oil system
to my knowledge. Here is a picture of the critical rotor cooling
oil drain back (black) passages.
If it is possible you will need a multi section scavenge pump
draining oil from several critical areas in the engine.
The passages on the left of this picture are part of
the essential oil vapor recovery system. Bruce cut these off on
Tracy's RX8 engine to save weight with rather unsatisfactory results.
Oil vapor recovery became a real problem. So things may not be
as trivial as they may first appear.
Paul Lamar
Another bit of useful information, thanks Paul. Tracy mentioned his
problem with the oil vapor, what he did not say was that it was his engine
man's doing. Strike one more puzzle off my list.
Now if I could just find out how to control the stepper motor on the oil
injector pump, and what is the purpose of the vacuum feed to the injectors?
Ian Beadle
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Hard to say whose idea it was but it could have been Tracy's :)
C & D pins are 12 Volt supply. E,F,A & B pins are stepper coils 1,2,3,&4
respectively. Ground side is switched. There is also a position switch
which is monitored by the PCM to keep track of the amount of oil
being metered. Step up and step down.
Oil metered is a function of RPM, coolant temp and amount of intake air.
The oil nozzle receives barometric pressure to prevent the
negative pressure in the intake chamber from being applied to the oil inlet.
There is also a one way valve to prevent oil from flowing out of the
air hose side when positive pressure is in the intake chamber.
BTW As I was saying this is a good place to monitor the vacuum or MAP for
fuel injection purposes.
There is a fail safe mode when the PCM detects a insufficient amount
of oil it then limits the engine RPM. Limp home mode. This prevents
seizure of the apex seal. As I said many times before one of
the functions of the apex seal oil is to cool the seals.
One of the advantages of the RX8 engine side exhaust is the apex seals
run cooler.
Good luck on controlling the stepper motor. BTW that is an
extremely expensive part at around $1500 US.
If it were me I would forget it and mix 2 cycle oil with the fuel.
Paul Lamar
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