Paul,
I looked at my Rx8 rotor and the measurements are the same for the pin
locations - except for the 3 identified in the attached drawing.
These 3 positions are exactly where there are positions for pins in the
'cut in half' rotor picture i.e. they just fill in the gaps.

So from this data, I can only assume the internal voids are exactly the
same for all rotors.
George ( down under)


I know that not to be the case. The RX8 rotor internals are different as is
the way they are cast. Also here is another cut away rotor picture.
Don't know the year. Last picture.

Paul Lamar


Paul,
Years ago, I used to pull every third pin, then tap the hole with a 1/4-28
thread all the way down. Insert a grade 8 long set screw with red locktite,
and stake the top to prevent it from backing out. This is how we locked the
rotor gear from walking out of the rotor without having it snap ringed. I
was just too cheap to give my money to racing beat back then, and didn't
have my own machine shop to cut snap ring grooves!
We don't turn enough rpm to need this on the aircraft engines, but fun to
look in the rotors at the meat available for mods.
Larry


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