sales falling to 2.9%. 1940–1941 In 1940 the Series 80 was renamed Buick Limited. The Roadmaster name was transferred to the new Series 70, which was introduced at the same time as a brand new Series 50 Super. The Roadmaster featured a cutting-edge "torpedo" C-body. The new C-body that the 1940 Buick Roadmaster shared with the Super, the Cadillac Series 62, the Oldsmobile Series 90, and the Pontiac Torpedo featured shoulder and hip room that was over wider, the elimination of running boards and exterior styling that was streamlined and 2-3" lower. When combined with a column-mounted shift lever the cars offered room for six-passengers. The 1940 Roadmaster had a shorter wheelbase, was lighter, and was less expensive than the previous year's model. The formal and fastback sedans were discontinued. A 2-door coupe body style was newly introduced, and 3,991 units were sold. The coach-building firm of Brunn designed several custom-bodied Buicks for the Series 70, 80, and 90. Only one Roadmaster example is known to have been produced in 1940, an open-front town car, that was dubbed "Townmaster". Overall sales more than tripled to 18,345. Styling updates for 1941 were modest, but there were mechanical changes. The compression ratio was raised from 6.6:1 to 7.0:1, the "turbulator" pistons were redesigned, smaller spark plugs were new, and "Compound Carburetion" was introduced. This Compound Carburetion was the forerunner of the modern four-barrel carburetor and consisted of twin two-barrel carburetors. One unit operated all of the time, while the other operated only under hard acceleration. The new engine delivered 165 horsepower. With five more horsepower than a senior Packard, 15 more than any Cadillac, and 25 more than the largest Chryslers, it was the most powerful engine available that year on an American car. A new body style for this year was a two-door convertible, which sold 1,845 units. There was also a Brunn-designed convertible, but no orders materialized because of the $3,500 price ($ in dollars ). Overall Roadmaster sales were 15,372. 1942, 1946-1948 The 1942 Roadmaster was longer, lower, wider, and roomier than before (a Harley Earl trademark), due in part to a longer wheelbase. There was also a new vertical-bar grille and "Airfoil" fenders that swept back to the rear fenders, which in subsequent generations became the chromed "Sweepspear". Both features became a Buick icon exhibited in one way or another for years to come, and were influenced by