The DeSoto Firesweep I Station Wagon, specifically the 1958 facelifted model equipped with the 5.7L V8 engine and PowerFlite automatic transmission, represented a significant offering in the American station wagon market. Produced from 1957 to 1958, this variant occupied a middle ground within the Firesweep lineup, balancing performance with the convenience and practicality expected of a family vehicle. It was part of the first generation of the Firesweep, a model intended to bridge the gap between the more affordable DeSoto Diplomat and the luxury-oriented DeSoto Adventurer.
Technical Specifications
| Brand | DeSoto |
| Model | Firesweep |
| Generation | Firesweep I Station Wagon (facelift 1958) |
| Type (Engine) | 5.7 V8 (280 Hp) PowerFlite |
| Start of production | 1957 |
| End of production | 1958 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 6 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Power | 280 Hp @ 4600 rpm |
| Power per litre | 48.8 Hp/l |
| Torque | 515 Nm @ 2400 rpm / 379.84 lb.-ft. @ 2400 rpm |
| Engine displacement | 5735 cm3 / 349.97 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.12 mm / 4.06 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 | 3.8 l / 4.02 US qt | 3.34 UK qt |
| Coolant | 16.1 l / 17.01 US qt | 14.17 UK qt |
| Fuel tank capacity | 76 l / 20.08 US gal | 16.72 UK gal |
| Length | 5540 mm / 218.11 in. |
| Width | 1989 mm / 78.31 in. |
| Height | 1450 mm / 57.09 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) | 142 mm / 5.59 in. |
| Minimum turning circle (turning diameter) | 14.2 m / 46.59 ft. |
| 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 | 2 gears, automatic transmission PowerFlite |
| Front suspension | Independent coil spring |
| 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 1958 Firesweep Station Wagon was the DeSoto 5.7-liter (349.97 cubic inch) V8 engine. This engine, utilizing a carburetor fuel injection system and an overhead valve (OHV) valvetrain, produced 280 horsepower at 4600 rpm and 515 Nm (379.84 lb.-ft.) of torque at 2400 rpm. The engine featured a 10:1 compression ratio and a robust cast iron block. The PowerFlite automatic transmission, a two-speed unit, was the sole transmission option for this configuration. The PowerFlite, while not known for its complexity, was a durable unit designed to handle the V8’s output and provide smooth, if not particularly sporty, shifts. It was a typical torque converter automatic of the era, prioritizing comfort and ease of use over outright performance.
Driving Characteristics
The combination of the 280 hp V8 and the two-speed PowerFlite transmission resulted in a driving experience geared towards comfortable cruising rather than spirited acceleration. While the engine provided ample torque for everyday driving and hauling passengers or cargo, the limited number of gears in the PowerFlite meant that the engine often operated at higher RPMs during highway speeds. Compared to the manual transmission options available on other DeSoto models, or the higher-output engines like those found in the Adventurer, the Firesweep with the PowerFlite felt less responsive. The gear ratios were optimized for smooth take-off and moderate acceleration, making it well-suited for suburban driving and family trips.
Equipment & Trim Levels
The 1958 Firesweep Station Wagon, in its base configuration with the 5.7L V8 and PowerFlite, offered a respectable level of standard equipment for the time. Interiors typically featured cloth and vinyl upholstery, with a focus on durability and practicality. Dashboard appointments were relatively simple, featuring a combination of analog gauges and chrome accents. Optional extras included power steering, power brakes, a radio, and whitewall tires. The station wagon body style itself added to the practicality, offering a large cargo area accessible through a rear tailgate. The trim level sat between the more basic Diplomat and the more luxurious Adventurer, offering a balance of features and affordability.
Chassis & Braking
The Firesweep Station Wagon utilized a body-on-frame construction, common for American cars of the era. The front suspension employed independent coil springs, providing a relatively comfortable ride. The rear suspension, however, relied on a traditional leaf spring setup, which was less sophisticated but durable and capable of handling heavier loads. Braking duties were handled by drum brakes on all four wheels, measuring 279 mm in diameter. While adequate for the vehicle’s weight and performance, the drum brakes lacked the stopping power and fade resistance of disc brakes, which were still relatively uncommon on American cars at the time. Steering was accomplished via a worm-reduction unit, offering a somewhat indirect feel.
Market Reception & Comparison
The 1958 DeSoto Firesweep Station Wagon received mixed reviews. Critics generally praised the spacious interior and comfortable ride, but noted the lack of performance compared to some of its competitors. Fuel economy, typical for a large American car of the late 1950s, was not a strong point. Compared to other station wagons in its class, such as those offered by Chevrolet and Ford, the Firesweep offered a similar level of practicality but often came with a slightly higher price tag. The PowerFlite transmission, while reliable, was often criticized for its limited number of gears and lack of responsiveness. The 5.7L V8 offered a good balance of power and reliability, but required regular maintenance to ensure optimal performance.
Legacy
The DeSoto Firesweep, and the 1958 facelifted model in particular, represents a fleeting moment in American automotive history. DeSoto as a brand was discontinued in 1961, making these cars relatively rare today. The 5.7L V8 engine, while not as legendary as some of Chrysler’s other engines, proved to be a durable and reliable powerplant when properly maintained. In the used car market, surviving examples of the 1958 Firesweep Station Wagon are sought after by collectors and enthusiasts interested in classic American automobiles. The PowerFlite transmission, while simple, is generally considered to be a robust unit that can withstand years of use. However, finding parts for these older vehicles can be challenging, and restoration projects often require significant time and expense.
