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Hi Rick,
2 pretty nice motors looking in great shape. The big downside is they are both pump drive motors. I'm sure the Prestolite MKB has an internal spline drive for pump shaft, 9 tooth. I suspect the Porter also has no shaft extension. This is a major stumbling block for second life as EV propulsion.
Both are unidirectional in application with pumps. The Porter being PM is easily reversed with polarity swap. The MKB is series wound and requires internal mods to reverse. It also has the standard factory advance, 4.5°.
I think the Porter is nice and would be great for light duty and smaller EVs like bikes, carts and yard tractors. Likely can tolerate a bit more voltage but not a lot.
The MKB is a monster in my opinion. You don't see many of these. It has a long commutator with 12 brushes. That's more brush contact area than a Warp11. And that relates to inrush current tolerance. Like at launch in a dragster. I'd love to see this in that Jr comp dragster on the other thread paired with a Z3kA controller. Actually for normal EV duty it may have too much brush and difficulty filming properly.
Regards,
major
2 pretty nice motors looking in great shape. The big downside is they are both pump drive motors. I'm sure the Prestolite MKB has an internal spline drive for pump shaft, 9 tooth. I suspect the Porter also has no shaft extension. This is a major stumbling block for second life as EV propulsion.
Both are unidirectional in application with pumps. The Porter being PM is easily reversed with polarity swap. The MKB is series wound and requires internal mods to reverse. It also has the standard factory advance, 4.5°.
I think the Porter is nice and would be great for light duty and smaller EVs like bikes, carts and yard tractors. Likely can tolerate a bit more voltage but not a lot.
The MKB is a monster in my opinion. You don't see many of these. It has a long commutator with 12 brushes. That's more brush contact area than a Warp11. And that relates to inrush current tolerance. Like at launch in a dragster. I'd love to see this in that Jr comp dragster on the other thread paired with a Z3kA controller. Actually for normal EV duty it may have too much brush and difficulty filming properly.
Regards,
major