third try
In the early 1940s the Navy saw a need for a high pressure portable firefighting pump. The highest power outboard at that time was the Evinrude Racing 460. Evinrude modified it to become the Storm Boat Motor, Johnson modified it to become the P500 Pumper. Being portable, it may not have a good source of water. Bubbles in the input caused periods of over the red line engine speed. Johnson designed a shorter heavy duty connecting rod for the pumper. After the war these Army Surplus pumps were snapped up and rebuilt to be used as racers. At one time Clyde Weisman (Wisco Piston Co.) furnished a high dome racing piston for the Speeditwin that used these shorter pumper rods.
