We have a number of old 4160V Allis Chalmers motors that we plan to replace with new motors. We'll need to adapt the frame but can't find any information on the existing frame dimensions. The motors are 100 Hp and have a frame size stamped on the nameplate of 23BS8. It also states that they are NEMA design, Allis Chalmers, Type AW motors. We can't find any NEMA frame table with 23BS8. I believe the S typically would imply short shaft but I've not seen a B in a frame size. Does anyone know of a table with this frame size identified?
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