The DeSoto Firesweep, particularly the 1959 four-door sedan, represented a significant, though ultimately short-lived, attempt by the DeSoto division of Chrysler Corporation to compete in the mid-range American automotive market. Produced from 1958 to 1959, the Firesweep was positioned as a more affordable alternative to Chrysler’s higher-end models, offering a blend of style and performance. The 1959 facelift brought revised styling cues, aiming to attract buyers with a more modern aesthetic. This specific variant, equipped with the 5.9-liter V8 engine producing 295 horsepower, was a key offering within the Firesweep lineup, representing a balance between power and cost.
Technical Specifications
| Brand | DeSoto |
| Model | Firesweep |
| Generation | Firesweep I 4-Door Sedan (facelift 1959) |
| Type (Engine) | 5.9 V8 (295 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 | 5.9 kg/Hp, 170 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 304.9 Nm/tonne |
| Power | 295 Hp @ 4600 rpm |
| Power per litre | 49.9 Hp/l |
| Torque | 529 Nm @ 2400 rpm, 390.17 lb.-ft. @ 2400 rpm |
| Engine displacement | 5916 cm3, 361.02 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 104.65 mm, 4.12 in. |
| Piston Stroke | 85.85 mm, 3.38 in. |
| Compression ratio | 10:1 |
| 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 | 16.1 l, 17.01 US qt | 14.17 UK qt |
| Kerb Weight | 1735 kg, 3825.02 lbs |
| Fuel tank capacity | 76 l, 20.08 US gal | 16.72 UK gal |
| Length | 5514 mm, 217.09 in |
| Width | 1999 mm, 78.7 in |
| Height | 1443 mm, 56.81 in |
| Wheelbase | 3099 mm, 122.01 in |
| Front track | 1547 mm, 60.91 in |
| Rear (Back) track | 1516 mm, 59.69 in |
| Ride height (ground clearance) | 140 mm, 5.51 in |
| Minimum turning circle (turning diameter) | 14.2 m, 46.59 ft |
| Approach angle | 15° |
| Departure angle | 10° |
| 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, 279 mm |
| Rear brakes | Drum, 279 mm |
| Steering type | Worm-reduction unit |
Powertrain & Engine Architecture
The heart of the 1959 Firesweep was the Chrysler-built 5.9-liter (361 cubic inch) V8 engine. This engine, designated within Chrysler’s engine family as the “B” engine, 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 carburetor for fuel delivery, a common practice for the time, and boasted a 10:1 compression ratio. The valvetrain employed traditional pushrods and rocker arms. While not particularly advanced by modern standards, the engine was known for its strong low-end torque and reliable performance. The three-speed manual transmission was the standard offering, providing a direct connection to the rear wheels. The transmission’s gear ratios were geared towards providing adequate acceleration and cruising ability, though it lacked the sophistication of more modern automatic transmissions.
Driving Characteristics
The 1959 Firesweep with the 5.9-liter V8 and manual transmission offered a driving experience typical of large American sedans of the era. Acceleration was brisk, with the engine delivering ample torque for everyday driving and passing maneuvers. The three-speed manual transmission required deliberate shifting, and the gear ratios weren’t optimized for fuel economy. Compared to potential upgrades like a higher horsepower engine, this configuration prioritized usability and affordability. The suspension, featuring independent torsion bars in the front and leaf springs in the rear, provided a comfortable ride, though it wasn’t particularly sporty. Handling was generally considered adequate for the time, but the Firesweep was not designed for aggressive cornering.
Equipment & Trim Levels
The Firesweep, even in its base form, offered a reasonable level of standard equipment for the late 1950s. Standard features typically included a full wheel cover, two-tone paint options, a spacious interior with cloth upholstery, and a basic AM radio. The interior was characterized by a relatively simple dashboard layout with analog gauges. Optional extras included power steering, power brakes, a continental kit, and upgraded interior trim. The Firesweep was positioned as a step above the entry-level DeSoto, offering a more refined interior and a more powerful engine than the base models.
Chassis & Braking
The Firesweep rode on a traditional body-on-frame chassis, providing a robust and durable platform. The front suspension utilized independent torsion bars and a double wishbone setup, while the rear suspension employed leaf springs. This configuration offered a good balance of ride comfort and load-carrying capacity. 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 a relatively heavy but precise steering feel.
Market Reception & Comparison
The 1959 Firesweep faced stiff competition from other mid-size American sedans, including offerings from Ford, Chevrolet, and Plymouth. Critics generally praised the Firesweep’s styling and powerful engine, but some noted its relatively basic interior and lack of advanced features compared to some competitors. Fuel economy was typical for the era, averaging around 15-18 miles per gallon. Reliability was generally considered good, though maintenance costs could be relatively high due to the engine’s size and complexity. Compared to other DeSoto models, the Firesweep offered a more affordable entry point into the brand, appealing to buyers who wanted a stylish and powerful car without the expense of a Chrysler.
Legacy
The DeSoto Firesweep, and the DeSoto brand as a whole, was discontinued after the 1961 model year. The Firesweep’s relatively short production run has made it a sought-after collectible among enthusiasts of classic American automobiles. The 5.9-liter V8 engine is known for its durability and relative simplicity, making it a popular choice for restoration projects. While not a groundbreaking vehicle in terms of technology or innovation, the 1959 Firesweep represents a significant chapter in American automotive history, embodying the style and optimism of the late 1950s. Today, well-maintained examples command a respectable price in the used car market, appealing to collectors and enthusiasts who appreciate the classic American aesthetic.
