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Motor Years Bore Stroke CC
2.0 DOHC FS 1993+ 83 92 1991

Models: FWD 626/MX6, 1999+ Protege, Protege5

Randy Stocker said:
The ?F? motors (F,FE,F2, FS) are larger in both bore spacing and deck height than the ?B?s are are mostly unrelated. Little to nothing will interchanges between the 'B' and 'F' motors, even the bellhousing bolt pattern is different from the 'B' motors.

The 'F' engines are the 'big blocks' of the 4 cylinders. They are long stroke motors and are generally not designed for high revs. All were cast iron SOHC with the exception of the FS and FE3.
 

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Ah ha... some sleuthing around has led me to believe that this is the 2.0L Protege engine in the FS series. Hence the "FS2" which i think is short for FS2.0L. Turns out that a few Mx6's had it as well. links are here and here and one more here

-Jeremy

edit: darn.. beat to the punch.. but either way.. there's the links.
 

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I would suggest an FE3 (forged internals). One of the members on miataturbo.net runs one now, and another has a fully built one. Great torque.
 
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