Oldsmobile straight-8 engine

The Oldsmobile straight-8 was an inline eight-cylinder side-valve engine that Oldsmobile produced in the 1930s and 1940s. It was the company's top engine choice from 1932 until the overhead-valve Rocket V8 arrived in 1949, and for a short time it was exclusive to the Oldsmobile L-Series. The first version displaced 240.4 cubic inches (3.9 litres) and made 87 brake horsepower at 3,350 rpm in 1932, rising to 90 in 1933 and 100 horsepower in 1935 before it was replaced in 1937. It had removable shell bearings from 1933 and a distributor mounted on the cylinder head, and the series was shared with LaSalle in 1934 to 1936 in a variant of 248 cubic inches. The second version, of 257 cubic inches (4.2 litres), made 110 brake horsepower at 3,600 rpm and 210 pound-feet of torque at 2,000 rpm, later 115 horsepower with higher compression, and ran for 11 years.