Taking a look at history and how the
internal combustion engine has evolved:

19th Century
designed over 150 years ago, circa 1860.

Four-stroke Otto cycle used in
gasoline and diesel engines.
(courtesy Wikipedia)

20th Century
designed over 50 years ago, circa 1957.

Felix Wankel's four-stroke
Kreiskolbenmotor rotary type engine.
(courtesy Wikipedia)

And NOW, the engine of the new millenium

The GARRIC cycle engine -
designed IN THIS century,
to meet the changing and dynamic
needs OF THIS century.

THE FUTURE OF THE INTERNAL COMBUSTION ENGINE IS