I am looking for these dimension from the flywheel 13-b RX-7 if someone
  have one on hand uninstalled i would really appreciate those
 informations
  see photo

  Jean Prudhomme

   Which dimensions? hole spacing? Diameter? Hole size? How exact do you
   need... I happen to have one off the plane right now :-)
   -- David Leonard
   Dave you are insured. Sky Smith had the info on you. You are famous.
   As far as I can tell you can fly the RV4 anytime.
   Apparently two successful off airports counts for a lot :)
   I need a medical and and bi annual. Both have recently expired. I
 got them
   for
   flying in Oz.

   Paul Lamar


   Hi David i will need all holes diameter and holes circle so i can
 compare
   with
   the RX_8 flywheelThank's for your assistance


   Jean Prudhomme


   Jean, I received the damper plate today. All is well. Thanks.
   If someone hasn't already given them to you, I picked up my RX-7 flex
   plate from
   the hangar today. I will measure it tomorrow if you still need them.
   C. Smith


C. Smith Thank's for your response of received the damper plate,yes i
  still
need the holes dimensions on the RX-7 flywheel just to compare if
 both are
interchangeable, but i found an idea to use the RX-8 flywheel and the
standard Tracy damper but Paul recommend 4130 instead of aluminum plate
  but
it will add a few pounds, you see the rx8 one  is design differently
 then
the rx7 with those big holes away of center holes and closed to the
 ring
gear and by using a bolted plate to the original holes 12mm the Tracy
  damper
plate by attaching the rubber bushing holes and are line up with the
 rx8
  big
holes for the bolts head clearance.There is a sketch for this
 additional
plate no welding and no balancing i guess it worth to try.


Jean Prudhomme

  Jean,

  The center 6-bolt pattern is the same for the RX-7's and the RX8.But that
  is not the whole story. There are 2 different fly wheels (use with
 manual
  transmissions) and 2 different flex plates (used with automatic
  transmissions).  Divided thus:

  "non-turbo" flywheel - used with all manual n.a. RX-7s  This is smaller
  diameter than:
  "turbo" flywheel - used with all manual turbo RX-7s and all manual
 RX-8's
  RX7 flex plate - used with all auto RX7's
  RX-8 flex plate - used with all auto RX-8s (and there is a cosmo flex
 plate
  as well)
-- the flex plates require the appropriate counter weight and that
  supplies the 6-bolt holes
-- The fly wheels have the counter weight built in.. unless you are
 using
  an aftermarket flywheel, in which case most will bolt up to the counter
  weight.  The aftermarket flywheels come in many different weights and
  materials

  Tracy used the RX-7 flex plate and his damper plate will not directly
 fit
  on
  the RX8 flex plate or either of the flywheels.  The flywheels put the
 ring
  gear in different locations from each other, with the n/a RX7 being
 smaller
  than the Turbo RX7/RX8.

  But I have not been able to figure where the RX7 auto flex plate puts
 the
  ring gear in relation to the flywheels (though it seems to have the same
  number of teeth as the turbo RX7/RX8 flywheel)

  Tomorrow afternoon I will be able to get to the hangar and let you
 know the
  size of the -7 flex plate relative turbo flywheel.  Since the
 flywheels are
  already really beefy, I was hoping there might be an easy adaptation
 of one
  that would put the ring gear and damper place in the right spot...  but
  that
  is seeming more and more unlikely.

  --
  David Leonard

  Turbo Rotary RV-6 N4VY
  http://N4VY.RotaryRoster.net
  http://RotaryRoster.net

  This will work Dave. .090" thick ought to work. Jeff can cut it.
  Individual spacers for each bolt or a ring spacer will work. Longer
 bolts
  for the counter weight connection.

  Paul Lamar

Hello guys just looking at your design. Are you happy with that spacer
 set-up? I'd like 3/8" 1/2" wall thickness to keep the bolts in shear and
 reduce the tension load. Back to you.
Graeme.


You might also do an interference press fit of the ring gear on the disk
in addition to welding/bolts.
~Cary