Everyone,

  I am trying to build up a motor from two.  One is an 89 that ate an apex
 seal and took out the front
  rotor and rotor housing.  The second motor is a 86 to 88 with rotor
 housings that look worn and I
  practiced P Porting on them.  My question is that I will get another 89
 rotor housing use the 86 to
  88 rotors and Eshaft, front counter weight what flex plate and
 counterweight will be required?  Do
  the 89 to 91 automatics have a different counterweight than the 86 to
 89s?
 Thanks for any help.

  Joe Berki
  Limo EZ

  I think the main problem with end housings previous to 1989 was no heat
 treating
  on the wear surface. My guess is they would last for 500 hours or so.
 Just
 a wild
  ass guess. You can however send them out and get them re nitride.
 Relative
 to the
  cost of new end housings it is cheaper. Bruce Turrentine may know of a
 place
  in North Carolina that can do that. I think you are at Langley.


  Does anybody have Bruce's email address?

  Paul Lamar


 I plan on using the 89 intermediate and end housings if they measure
 out for
 flatness and wear.  The 86 to 88 end housings lookde pitted.

 Joe

 If the pits are not too deep it can be lapped. If too deep for lapping
 it can be blanchard ground, lapped and re nitride.

 BTW Joe check your email program and make sure it sends plain text only.

 Paul Lamar


Hi Joe;
You want a rear counterweight to match the series (weight) of the
rotors.  See the attachment to identify the rotors.

The CWs look virtually identical.  The series 5 are lighter to match the
lighter S5 rotors.
Series 4 CWs are harder to find used but can be bought new from
Mazdatrix, Mazda.

I believe all of the irons are nitrided.  Wear limit is .0039 IIRC.
Good used NA irons with less than .0001 wear can be had for $20 a piece,
sometimes free.

The flexplates are also slightly different.  I think Tracy's redrive
setup uses the S4 flex plate.  You can usually find these cheaply on
www.rx7club.com or ebay as people people convert from automatic to
manual transmissions.

Cheers
Cary