Marc Wiese wrote:

87/88 Turbo housings (maybe 89+???) also have the leading spark plug

located 5 mm further toward the top of the engine than in a 93.  The

trailing plugs are in the same place.  Again, I don't KNOW if this

means "don't use them"... just another difference.

This is the difference between the 1986-1988 Zenki FC3S rotor housings versus the 1989-1991 Kouki FC3S and FD3S rotor housings. The lower spark plugs positions put it in a more advance timing position; I can't confirm if the stock ECU timing is compensated/retarded for the spark plug move.

I'm also not sure if any of the 87-91 turbo housings have the threaded

hole in the rotor housing for the knock sensor.  (At least on my 87,

the knock sensor mounts on the intermediate housing).

1989-1991 Kouki FC3S has the same threaded bosses on the rotor housings above the trailing spark plug.  Basically, the 1989-1991 Kouki rotor housing should be pretty close to the FD3S rotor housing.

The 93s also got a small groove cut in the "leg" of each housing.  I

assume that this was put there to help hold sealant in place.

Yep, this is just to help the sealant stay in place.

Found on another list - information that I haven't seen before.........

Marc Wiese

 
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