The Curtiss B-8 was an early air-cooled 8-cylinder engine used for a number of aircraft and one motorcycle designed by Glenn Curtiss. Made in 1906, the Curtiss V-8 motorcycle set a speed record in January 1907. The engine type powered the AEA June Bug on 4 July 1908, becoming the first Curtiss engine to power a heavier-than-air aircraft in sustained flight.
According to Dale Stoner, who had built a replica of the V-8 motorcycle, it ran with 1675 rpm at 136 mph. He added a 1:3 transmission to slow the replica down.
A comparable, earlier French design is the Antoinette 8V that since 1904 powered several boats and aircraft.
Applications included: