The DeSoto Firedome III Four-Door Sedan, as presented in its 1959 facelift, represented a significant offering from the Chrysler Corporation’s mid-range brand. Produced for the 1958 and 1959 model years, the Firedome III occupied a position between the entry-level DeSoto Firesweep and the more luxurious DeSoto Adventurer. This particular variant, equipped with a 6.3-liter (382.99 cubic inch) V8 engine producing 305 horsepower and paired with a TorqueFlite automatic transmission, aimed to deliver a blend of performance and comfort for the American family. The Firedome name itself evoked a sense of power and prestige, aligning with DeSoto’s marketing strategy of offering “dependably fine” automobiles.
Technical Specifications
| Brand | DeSoto |
| Model | Firedome |
| Generation | Firedome III Four-Door Sedan (facelift 1959) |
| Type (Engine) | 6.3 V8 (305 Hp) TorqueFlite |
| Start of production | 1958 |
| End of production | 1959 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 6 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Power | 305 Hp @ 4600 rpm |
| Power per litre | 48.6 Hp/l |
| Torque | 556 Nm @ 2400 rpm / 410.08 lb.-ft. @ 2400 rpm |
| Engine displacement | 6276 cm3 / 382.99 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 107.95 mm / 4.25 in. |
| Piston Stroke | 85.85 mm / 3.38 in. |
| Compression ratio | 10.1:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 4.7 l / 4.97 US qt | 4.14 UK qt |
| Coolant | 15.1 l / 15.96 US qt | 13.29 UK qt |
| Fuel tank capacity | 87 l / 22.98 US gal | 19.14 UK gal |
| Length | 5616 mm / 221.1 in. |
| Width | 1999 mm / 78.7 in. |
| Height | 1450 mm / 57.09 in. |
| Wheelbase | 3200 mm / 125.98 in. |
| Front track | 1549 mm / 60.98 in. |
| Rear track | 1516 mm / 59.69 in. |
| Front overhang | 889 mm / 35 in. |
| Rear overhang | 1527 mm / 60.12 in. |
| Ride height (ground clearance) | 142 mm / 5.59 in. |
| Minimum turning circle | 15.2 m / 49.87 ft. |
| Approach angle | 15° |
| Departure angle | 11° |
| Ramp-over angle | 10.4° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission TorqueFlite |
| Front suspension | Independent torsion bar, double wishbone |
| Rear suspension | Leaf spring |
| Front brakes | Drum, 305 mm |
| Rear brakes | Drum, 305 mm |
| Steering type | Worm-reduction unit |
Powertrain & Engine Architecture
The heart of the 1959 Firedome III was Chrysler’s 383 cubic inch (6.3-liter) V8 engine, designated as the “B” engine family. This engine featured a cast iron block and cylinder heads, with a 10.1:1 compression ratio. The engine utilized a single Carter carburetor, providing fuel delivery to the overhead valve (OHV) configuration with two valves per cylinder. The 383 V8 was known for its robust construction and relatively simple design, making it a reliable powerplant for the era. The TorqueFlite automatic transmission, a three-speed unit, was a Chrysler innovation and offered smooth and relatively quick shifts for its time. It was a fully automatic transmission, meaning it didn’t require manual gear selection, contributing to the ease of driving expected by American consumers.
Driving Characteristics
The combination of the 305 horsepower V8 and the TorqueFlite automatic transmission provided the Firedome III with respectable performance for a full-size sedan of the late 1950s. While not a sports car, the Firedome III offered ample power for highway cruising and passing maneuvers. The automatic transmission, while convenient, did result in some power loss compared to the available manual transmission options. The TorqueFlite’s gear ratios were optimized for acceleration and cruising, but it lacked the responsiveness of a modern automatic. The car’s substantial weight (approximately 3,800 pounds) meant that acceleration was adequate rather than exhilarating. The ride quality, however, was a strong point, thanks to the independent torsion bar front suspension and leaf spring rear suspension.
Equipment & Trim Levels
The Firedome III was positioned as a mid-range DeSoto, offering a good balance of features and affordability. Standard equipment included a spacious interior with comfortable bench seats, a full-width dashboard with a prominent instrument cluster, and ample chrome trim both inside and out. The interior typically featured cloth and vinyl upholstery. Power steering and power brakes were often included as standard equipment, reflecting the growing demand for convenience features. Optional extras included air conditioning, a radio, and whitewall tires. The 1959 facelift brought revised styling, including a more prominent grille and redesigned taillights, enhancing the car’s visual appeal.
Chassis & Braking
The Firedome III utilized a body-on-frame construction, typical of American automobiles of the period. The chassis featured an independent torsion bar suspension at the front, providing a comfortable ride and improved handling compared to older designs. The rear suspension employed leaf springs, which were durable and capable of handling the car’s weight. Braking was accomplished via drum brakes on all four wheels. While adequate for the time, the drum brakes lacked the stopping power and fade resistance of disc brakes. Steering was handled by a worm-reduction unit, which provided relatively heavy but precise steering feel.
Market Reception & Comparison
The 1959 DeSoto Firedome III received mixed reviews from automotive critics. While praised for its comfortable ride and spacious interior, it was often criticized for its styling, which some found overly flamboyant. Compared to its siblings, the Firesweep and Adventurer, the Firedome III offered a middle ground in terms of price and features. The Firesweep was the more affordable entry-level model, while the Adventurer was the premium offering with more powerful engines and luxurious appointments. The Firedome III’s fuel economy was typical for a full-size American car of the era, averaging around 15-18 miles per gallon. Reliability was generally good, although the carburetor could require occasional adjustment.
Legacy
The DeSoto brand was discontinued by Chrysler Corporation in 1961, making the 1959 Firedome III one of the last models produced under the DeSoto name. Today, the Firedome III is a sought-after classic car, particularly among enthusiasts of 1950s American automobiles. The 383 V8 engine is known for its durability and relative simplicity, making it a relatively easy engine to maintain and rebuild. While parts availability can be a challenge, a dedicated network of suppliers caters to the classic DeSoto market. The Firedome III represents a unique chapter in American automotive history, embodying the style and engineering of the late 1950s.
