They were manufacture at Detroit diesel engine division in Redford MI west of Detroit.
In 1939 they produced the “71’’ family of 2,3,4 and 6 2 stroke engines. Each cylinder displaced 71 cubic inches. Bore x Stroke 4.25x5.00.
1939 4-71 had 110 HP@ 2000 rpm, 350 @ 1000-1200 Torque. In 1951 they had a “Million-Mile’’ upgrade that increase the HP to 150 @ 2100 rpm and 395 @ 1600 Torque. 54 they were Re-calibrated, HP 150 @ 2300 rpm and 374 at 1500-1600 Torque. In 1957 a one year only 4-71T turbocharged. 4-71 was discontinued after 1959.
1940 12 new Futurliners were built, replacing the original nine Streamliners. 10 used the 4-71.
