Kemp (Grey Eagle) I-4 or D-4
Due to its simple design and quantity production, this air-cooled engine sold for approximately one half the price of its water-cooled competitors and was lighter, more streamlined, and trouble-free than most of them.
The early models such as this one, had concentric valves which presented a large valve area, but a complicated design. Later models were equipped with conventional valves. All of the 2-, 4-, and 6-cylinder models had automatic intake valves.
A Kemp Model D-4 powered Walter Ralston's 1912 biplane.
Gift of Mrs. L. L. Walker Houston, TX.
Country of Origin: United States of America
Type: In-line, 4 cylinders; air-cooled, concentric valves; automatic inlet valve
Power rating: 26 KW (35 hp) at 1,150 rpm
Displacement: 4.18 L (255 cu in)
Bore and Stroke: 10.80 cm (4.25 in) x 10.80 cm 4.25 in
Weight: 82.2 kg (181 lb) (5.17 lb/hp)
Condition: Missing data plate, push rod, rocker arm, 2 rocker support bosses, 2 front cylinder cooling fins broken, on stand.