George Lendich wrote:

Paul,
I was at the local mazda parts supplier the other day going through the different housings and came across a later model 13 B ROTOR housing with a small hole
just about the inlet manifold position - this was a direct oil injection into the rotor seals.

My question is what year/years were this - was there a marked benefit and has the Renesis engine followed this injection principle.

It would appear to me that the oil injection process has gone through the stages of, injection into the carby, injection into the fuel inlet at the
side/centre housings and finally directly through the Rotor housings -
I'm wondering which is better?

Also has anyone examined the Renesis oil pump to see if there are any major changes? To successfully develop a aluminium housing I would need to consider the
best option for the OIL Pump - considering recent discussions on this issue.
George (down under)

I think that was started about 1985 or there abouts. When Mazda went to fuel
injection from carbs. Could be even earlier. I am not sure.
The RX8 engine has two oil injection ports per rotor housing near 
the ends of the apex seals. The apex seals in the RX8 engine probably 
run much cooler than the 500 degree F the current seals run as hot 
exhaust gases do not pass by them on the way out the side exhaust ports. 
Therefor it is not as important to inject the oil in the center of the rotor
housing as a major function of the oil is to cool the apex seals.
Probably less oil is now required to cool the RX8 apex seals as they
have a much easier time of it.

Paul Lamar
 
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