The answer is "It Depends"...............The early 89 engines had the same weight rotors
and counterweights as the 86 to 88 engines.............The answer is the rotors combustion chamber "dish".........The 86 to 88 1/2 rotors have a slightly rough (As Cast) finish where
as the 89 1/2 to 91 rotors have a "Machined "combustion dish finish..............
If your "89" rotors are late (machined combustion dish) then 89 rear counterweight will not
work with your 86-88 rotors.............
If your "89" rotors are early (rough combustion dish) then the 89 rear counterweight will
work with your 86-88 rotors...............
See attachment...........
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "josrph berki" <jskmberki@windstream.net>: --------------
> 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