| Ford Super Duty V8 | |
| Manufacturer: | Ford Motor Company |
| Production: | 1958 - 1981 |
| Predecessor: | Lincoln Y-block |
| Successor: | Ford 385 V8 |
| Configuration: | 90° V8 |
| Displacement: | 4011NaN1 4771NaN1 5341NaN1 |
| Valvetrain: | OHV, 2 valves per cylinder |
| Block: | Cast iron |
| Head: | Cast iron |
| Compression: | 7.5:1 |
| Coolingsystem: | Water-cooled |
| Fueltype: | Gasoline |
| Turbocharger: | Twin-turbo on 5341NaN1 marine version |
| Weight: | 1300lb (534ci twin-turbo marine version) |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
The Ford Super Duty engine is a range of V8 engines that were manufactured by Ford Motor Company. Introduced in 1958, the Super Duty engines replaced the Lincoln Y-block V8 (alongside the smaller Ford MEL V8 engines).
By the end of the 1970s, the use of the Super Duty engine began to decline in heavy trucks in favor of diesel-fueled engines; in medium-duty trucks, variants of the similar-displacement (but higher-efficiency) 385-series V8s became more commonly used. In 1981, Ford withdrew the Super Duty engine line.
Through its production, the Super Duty engines were assembled by Ford in its Cleveland Engine Plant #2 in Brook Park, Ohio.
The Super Duty engine is 90-degree overhead-valve V8 with angled piston decks. The cylinder heads are flat and the pistons are crowned to create a wedge-shaped combustion chamber within the cylinder bore; the compression ratio is 7.5:1 for all models. They are typically governed to 3400 rpm.
Three displacements were available during production: 4011NaN1, 4771NaN1 and 5341NaN1; but however large, the 534 was very much smaller than the 11001NaN1 Ford GAA all aluminum 32 valve DOHC V8 (introduced during WW2), which was the largest displacement gasoline engine ever mass-produced by Ford Motor Company for use in land vehicles.
The 401 has a cylinder bore and a stroke of NaNx. The 477 shares the 401's stroke with a larger NaN1NaN1 bore; the 534 has this same bore with a stroke of 4.21NaN1.
The early Super Duty has a unique intake system where the intake plenum is connected directly to the cylinder head; all four cylinders pull the air/fuel mixture from a single "log" type port in the head. The engines could "spit" when cold and blow the choke plate out into the air cleaner because of the large port configuration. In later engines this was corrected with a conventional spider-type intake. The exhaust valves are filled with sodium to carry heat from the valve head to the valve stem, which would dissipate it into the valve guide and thus to the coolant in the cylinder head.
A marine version of the 534, the "Seamaster", was available from the Seamaster Marine Engine Co. starting in the late 1950s. It was available either naturally aspirated or with twin-turbochargers with an intercooler, and had a dry weight of over 1300lb.[1] [2]
| Name | Configuration | Bore x stroke | Power output | Torque output | |
|---|---|---|---|---|---|
| SD-401 | 4011NaN1 | NaNx | 2260NaN0 @ 3600 rpm | 3500NaN0 @ 2500-3600 rpm | |
| SD-477 | 4771NaN1 | NaNx | 2530NaN0 @ 3400 rpm | 4300NaN0 @ 2500-3000 rpm | |
| SD-534 | 5341NaN1 | NaNx | 2660NaN0 @ 3200 rpm | 4900NaN0 @ 1800-2300 rpm |
Among the heaviest and highest-displacement V8 engines ever built by Ford, the Super Duty engines were never used in automobiles; its debut in medium and heavy trucks marked the renaming of Ford F-Series "Big Job" conventionals after the engine. Slotted above the 330, 361, and 391 FT V8s used in the medium-duty F-Series (F-500 to F-700 and B-series), the Super Duty was used in heavy-duty trucks, including the F-800, F-900 "Super Duty" conventionals.
Outside of the F-Series, the Super Duty engine was used in several model ranges of Ford heavy trucks, including: