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

 --


You might talk me into a ring spacer, Though a flat plate will not be as
stiff as one that is stamped into a bell shape like the flex plate.  Also,
don't forget that the ring gear sits basically around the damper plate
because the flex plate has a recess (see pic -disk on right is flex plate,
left is turbo flywheel).