Also Don. It is possible to move the starter to almost any clock position
if you are using a Tracy style adapter plate.
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Don is using the stock bell housing for his own PSRU design and build.
The 45 degree solenoid version won't fit. Perhaps Don can cut a clearance
hole in the bell housing. Anybody else got any ideas?

Paul Lamar

Don,
Having built 2 bellhousings, I have researched the starters available, that
I'm aware of the . Sadly the starters all vary to a degree including depth
of the snout, so the meshing gears are all of a different depth. This can be
over come with packing or other approaches, I believe one chap actually
installed his starter on the inside of  Al mounting plate.

The Subaru starters have the same tooth profile as the Mazda ring gear, so
their an option.

I would like to know more about the RX8 starter, if someone had one
available to do some measurements.

The Auto flex plate is the lightest ring gear, but the largest OD, the
manual is smaller and to my mind the best size, because of the clearances in
the BH. I think if I was going to design from scratch I would  look for a
ring gear the size of the manual OR a lightened manual flywheel, which would
be nice and flat, on which to attach the damper system.

I have designed around the Turbo starter as they are the most common starter
available here, as all the aftermarket engines imported into Australia were
Turbo engines.
Hope that helps.
George ( down under)