Paul,
   this file is proven bolt hole positions based on cmm data for bell
   housing.
   It appears the low power rx8 engine may have a different rear plate.
   With the plate being cnc machined, I would make several versions based
   on the housing they are using.
   Easy enough, once the programs are written.
   Larry

   Yes I think you are right. I suspect the only difference is down on the
   left side
   where the auto tx starter is located. There is a bell housing bolt
   missing.
   No problem for us as that bolt can be left out.

   The latest RX8 low power auto tx engines appear to
   be the same as the high power version. I cannot confirm this yet.
   The change occurred around 2006 I think.

   Thanks for the bolt location file.

   -----------------------------------------------

   Larry, I see you have the RX8 rear end housing extra bolt hole
   in there. Did you digitize an RX8 end housing. If you are confident
   in this location no need for us to reinvent the wheel. Looks good to
   me. Can you or Jeff send me a thin steel (low expansion) metal plate
   with a large (13 inch) hole in it  to clear the starter ring gear that I
   can
   use to check the fit on a real RX8 engine? Perhaps Mazdatrix
   has a late model RX8 auto tranny version or even a RX8 manual tranny
   version I can check it against. Mazdatrix is a lot closer than Escondido
   :)

   Jeff please check these dimensions against the last 3D I sent
   for the extra RX8 top bolt hole. I have lots of confidence in what
   Larry does.

   Paul Lamar

  Paul,
  We measured the hole position distance from the common hole up on top
  next
  to it. All holes are 7.164 from center (that is the magic number), so we
  only needed one dim to get it.
  All other holes were taken on the cmm direct from a rear housing.
  If you wanted to go to your engine and measure the center to center dim
  between the top 2 holes, I will check my model and get back to you.
  Seems to
  me we were pretty confident in this number before.
  Larry

  Not all holes are on the 7.164 radius.
  There is at least one on the 13B that is
  7.085 on the lower right in dwg #2 attached.
  I was worred that the RX8 hole was not on the
  7.164 radius but it looks like it might be.


  I'll see what I can do about measuring it.
  I have to get a couple of short 100 mm screws
  with the right thread.

  Paul Lamar

 Paul

 I'll check  the pdf file against mine we where we stand.....you want a
 template when we get this solved?


 jeff

 Yes. I am on my way out to the hangar to measure the distance
 between the top two holes as per Larry's suggestion. I'll buy
 the radius being the same as there is no reason to change it up
 there.

 If there is a problem it will show up in the template.

 Paul Lamar


 OK we stuck it in the Bridgeport and used a height gage
 to get the heights. We used the digital read out to get
 the horizontal measurements. The engine was set on one inch
 high blocks to clear the oil pressure regulator.
 Here are the raw measurements.

 Jim had a set of .001 inch increment pins which we used in the
 10 mm threaded bolt holes. We also referenced the hollow dowl pin.


 Paul Lamar

Here is the corrected para solid file.

Larry