There is a vertical four-cylinder Maxim engine appeared around 1909.

-It gave  87 HP at 1,400 rpm.

-Pistons had a bore of 5 inches and a 5.625-inch stroke.

-It turns out that in the 1904 there is another 87 HP Maxim engine with 4 water-cooled cylinders, weighing 220 lbs.

“Motor Maxim”

We do not have any more information, and continue investigating.