The Warner company was founded around 1927 in Detroit, MI, and it was dedicated to manufacturing excellent 5- and 7-cylinder radial engines, known as Scarabs.

-The 5-cylinder was called the Junior and Scarab Junior. The 7-cylinder was called the Scarab and Super Scarab.

“Warner Scarab Logo”

-The Warner Junior was a small, 5-cylinder, 50 HP engine. A larger, 90 HP version of the Scarab Junior received ATC Type Certificate 54 and was released two years later, in 1930.

“Scarab Junior”

“Warner ad in 1928”

-The 5-cylinder radial Scarab Junior was produced in series such as the -40 and -50. The 7-cylinder Scarab was also produced in -28, -29, -30, -40, and -50 versions, ranging from 110 HP to 125 HP and up to 185 HP.

-The first available Scarab was the 1928 ATC-2, with a 422 cu. in. engine that gave 125 HP at 2,050 rpm.

“Scarab, 125 HP”

-The Super Scarab was a larger, 7-cylinder engine, available in -40, -50, and -50A series. It had the military code R-500.

“Warner Super Scarab, 165 HP”

“Super Scarab R-500, rear view”

-The R-500-1 and -7 were 165 HP engines.

-There is a Warner R-500-7 in the MAE's engine reserve warehouse.

“Warner R-500-7”

-When the same engine appeared with an enlarged cylinder bore, the displacement increased to 555 cu. in. instead of 499 cu. in., resulting in a power increase of 185 HP (200 HP according to other sources, momentary power).

-It was the R-550 and ATC-235.

“Warner Super Scarab R-550, 185 HP”

-Around 1950, the company was sold to the Clinton Machine Corporation, and no further engines are known to have been produced.