Response to Hello Steven.  The Magnetek Century model B2854 is the correct replacement for your current motor. The compatible Variable Speed model would be the ECM16SQU.  A variable-speed motor utilizes less electricity than a single-speed motor because it operates at reduced motor RPMs - using less electricity, slowing circulation thus providing improved water filtering as well.  The programming flexibility of the Variable Speed Motor provides the flexibility to tailor the pump's performance to the water quality needs of the pool.  When replacing the motor it is recommended that the motor shaft seal, seal plate gasket, and diffuser o-ring also be replaced.  These parts are specific to the pump manufacturer/model and not the motor model.  More information would be helpful to determine these parts.  V-Green 1.65 HP Square Flange 48Y Variable Speed Motor - ECM16SQU

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