The DeSoto Firedome III Four-Door Sedan, as presented in its 1959 facelift, represented a pinnacle of American automotive styling and power during the late 1950s. Produced for the 1958 and 1959 model years, the Firedome III occupied the top-tier position within the DeSoto lineup, offering a luxurious and powerful experience. It was built upon the Chrysler corporation’s shared platform, and aimed to compete with offerings from Buick, Oldsmobile, and Mercury. This particular variant featured a 6.3-liter (382.99 cubic inch) V8 engine producing 305 horsepower, paired with a 3-speed manual transmission. The Firedome III was a statement of American optimism and design, though its production run was unfortunately short-lived, coinciding with the decline of the DeSoto brand.
Technical Specifications
| Brand | DeSoto |
| Model | Firedome |
| Generation | Firedome III Four-Door Sedan (facelift 1959) |
| Type (Engine) | 6.3 V8 (305 Hp) |
| Start of production | 1958 |
| End of production | 1959 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 6 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6.1 kg/Hp, 164.6 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 300.1 Nm/tonne |
| 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 |
| Kerb Weight | 1853 kg, 4085.17 lbs |
| 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 (Back) 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 (turning diameter) | 15.2 m, 49.87 ft |
| Approach angle | 15° |
| Departure angle | 11° |
| Ramp-over (brakeover) 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, manual transmission |
| 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 the Chrysler-built 383 cubic inch (6.3-liter) V8 engine. This engine, designated within Chrysler as the “B” engine family, was a robust and relatively simple design. It featured a cast iron block and cylinder heads, with an overhead valve (OHV) configuration. The engine utilized a single Carter carburetor for fuel delivery, a common practice for the era. The 383 V8 was known for its strong low-end torque, making it well-suited for the large and heavy DeSoto sedan. The 3-speed manual transmission was a standard offering, providing a direct connection between the engine and the rear wheels. While not particularly sophisticated by modern standards, the transmission was durable and reliable.
Driving Characteristics
The 305 horsepower and 410 lb-ft of torque delivered by the 6.3-liter V8 provided the Firedome III with respectable performance for its time. However, the car’s substantial weight (over 4,000 pounds) meant that it wasn’t a particularly nimble vehicle. Acceleration was brisk, but not exhilarating. The 3-speed manual transmission required deliberate shifting, and the gear ratios were optimized for cruising rather than outright speed. Compared to other Firedome III variants equipped with the optional automatic transmission, the manual version offered a more engaging driving experience, allowing for greater control over the engine’s power. However, the automatic was far more popular with buyers seeking a comfortable and effortless driving experience.
Equipment & Trim Levels
The Firedome III was DeSoto’s flagship model, and as such, it came standard with a generous array of features. Standard equipment included power steering, power brakes, a deluxe interior with cloth and vinyl upholstery, full wheel covers, and a heater. Optional extras included air conditioning, a radio, power windows, and a continental kit. The interior was characterized by its spaciousness and comfortable seating. The dashboard featured a prominent instrument cluster with clearly marked gauges. The overall design aesthetic was typical of the late 1950s, with generous use of chrome and brightwork.
Chassis & Braking
The Firedome III utilized a body-on-frame construction, which was common for American cars of the era. The chassis featured an independent torsion bar front suspension and a leaf spring rear suspension. This suspension setup provided a reasonably comfortable ride, although it wasn’t particularly sophisticated. Braking was accomplished by drum brakes on all four wheels. While adequate for the time, the drum brakes lacked the stopping power and fade resistance of modern disc brakes. The steering system employed a worm-reduction unit, which provided a relatively heavy but precise steering feel.
Market Reception & Comparison
The 1959 DeSoto Firedome III received generally positive reviews from automotive critics. It was praised for its powerful engine, comfortable ride, and spacious interior. However, some critics noted its large size and relatively unsophisticated handling. Compared to other Firedome III variants, the 3-speed manual transmission version was favored by enthusiasts who appreciated its greater driver involvement. However, the vast majority of buyers opted for the automatic transmission, which was seen as more convenient and luxurious. The Firedome III competed directly with models from Buick, Oldsmobile, and Mercury, offering a similar level of luxury and performance.
Legacy
The DeSoto Firedome III, despite its short production run, remains a significant vehicle in American automotive history. It represents a high point in DeSoto’s design and engineering, and it embodies the optimism and extravagance of the late 1950s. While the 6.3-liter V8 engine proved to be durable and reliable, the Firedome III itself suffered from declining sales and the eventual demise of the DeSoto brand in 1961. Today, the Firedome III is a sought-after collectible car, particularly among enthusiasts of classic American automobiles. Well-maintained examples command a premium price, and the car is often seen at classic car shows and events. The 3-speed manual transmission version is particularly rare and desirable, adding to its collectibility.
