Pump-Jet lower units are designed provide a safe, strong performing, and reliable alternative to standard props. These lower units will fit Johnson/Evinrude 20-35hp outboards that have thru-hub exhaust and the gear shift connection contained within the water intake screen ( OMC outboards made from the early 1980's-today. Use 1992 as a cross reference). The gears and housing are the same as a standard lower unit with the exception of the rotor device and casing. As you can see from the photos below water is redirected and funneled from the rotor blade into a narrowing opening towards the back of the casing. AFA Marine has boat tested these lower unit devices and we were very impressed with the performance. We noticed improved acceleration and turning ability with this device. If you are looking to convert your Johnson/Evinrude 20-35hp outboard motor to a Pump Jet system this product is for you. All that is needed is to remove your existing lower unit and replace it with this one. The gears, shift rod connection, shaft, water tube, and bolt configuration are the same.
We
have More Lower Units for Sale Click Here
Lower
units for Mercury, Yamaha, Johnson, Evinrude, Force, Honda, Mariner, ETC..
Inside. Black rotor is the only moving part.
Front. Water is channeled into the rotor blade.
Back Inside. Water is then forced out through the narrowing opening which
provides the concentrated jet thrust.
Back
Side
In the 1990's, the U.S. Military recognized the need to develop an outboard motor which could be used safely night and day for training exercises with men and equipment in the water. Attempts to adapt cages and guards to open propellers resulted in unacceptable performance losses and decreased engine reliability. The Pump Jet provides added performance, safety, and reliability to outboard motors.