The Ford Bronco I 3.3, equipped with an 85 horsepower engine and all-wheel drive, represents an early iteration of the iconic Bronco line. Produced between 1966 and 1977, this variant occupied the entry-level position within the first generation Bronco (1966-1977) range. It was designed to offer a capable and affordable four-wheel-drive vehicle, appealing to buyers seeking utility and off-road potential. The Bronco I, built on a shortened Ford F-100 chassis, quickly gained popularity as a rugged and versatile vehicle, establishing a legacy that continues today. This specific 3.3-liter configuration was a mainstay of the early Bronco lineup, providing a balance between cost and capability.
Technical Specifications
| Brand | Ford |
| Model | Bronco |
| Generation | Bronco I |
| Type (Engine) | 3.3 (85 Hp) AWD |
| Start of production | 1966 |
| End of production | 1977 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (economy) – combined | 18.1 l/100 km |
| Fuel consumption (economy) – combined | 13 US mpg |
| Fuel consumption (economy) – combined | 15.6 UK mpg |
| Fuel consumption (economy) – combined | 5.5 km/l |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 20 sec |
| Acceleration 0 – 62 mph | 20 sec |
| Acceleration 0 – 60 mph | 19 sec |
| Maximum speed | 126 km/h |
| Maximum speed | 78.29 mph |
| Weight-to-power ratio | 17.9 kg/Hp |
| Weight-to-power ratio | 55.8 Hp/tonne |
| Weight-to-torque ratio | 7.4 kg/Nm |
| Weight-to-torque ratio | 134.5 Nm/tonne |
| Power | 85 Hp @ 3800 rpm |
| Power per litre | 26 Hp/l |
| Torque | 205 Nm @ 1800 rpm |
| Torque | 151.2 lb.-ft. @ 1800 rpm |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3273 cm3 |
| Engine displacement | 199.73 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 93.47 mm |
| Cylinder Bore | 3.68 in. |
| Piston Stroke | 79.5 mm |
| Piston Stroke | 3.13 in. |
| Compression ratio | 8.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Kerb Weight | 1524 kg |
| Kerb Weight | 3359.84 lbs. |
| Max. weight | 1950 kg |
| Max. weight | 4299.01 lbs. |
| Max load | 426 kg |
| Max load | 939.17 lbs. |
| Length | 3863 mm |
| Length | 152.09 in. |
| Width | 1748 mm |
| Width | 68.82 in. |
| Height | 1806 mm |
| Height | 71.1 in. |
| Wheelbase | 2337 mm |
| Wheelbase | 92.01 in. |
| Front track | 1458 mm |
| Front track | 57.4 in. |
| Rear (Back) track | 1458 mm |
| Rear (Back) track | 57.4 in. |
| Ride height (ground clearance) | 201 mm |
| Ride height (ground clearance) | 7.91 in. |
| Drag coefficient (Cd) | 0.65 |
| Minimum turning circle (turning diameter) | 10.2 m |
| Minimum turning circle (turning diameter) | 33.46 ft. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 3 gears, manual transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Drum |
| Tires size | 165/75 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the Bronco I 3.3 was the 3.3-liter inline-six cylinder engine. This engine, designated as the Ford 300 cubic inch (actually 3.3 liters) inline-six, was a robust and relatively simple design. It utilized a cast iron block and cylinder head, and employed an overhead valve (OHV) valvetrain. Fuel delivery was managed by a single-barrel carburetor, a common setup for the era. The engine produced 85 horsepower at 3800 rpm and 205 Nm (151.2 lb-ft) of torque at 1800 rpm. This torque output, while modest by modern standards, provided adequate low-end grunt for off-road driving and towing. The engine’s longitudinal front-engine layout contributed to the Bronco’s balanced handling. The 3-speed manual transmission was the standard offering for this variant, providing a direct connection to the engine’s power.
Driving Characteristics
The Bronco I 3.3 with the manual transmission offered a utilitarian driving experience. Acceleration was slow, with a 0-60 mph time of around 19 seconds. However, the engine’s torque characteristics made it well-suited for navigating challenging terrain. The three-speed manual transmission, while not offering the refinement of more modern gearboxes, provided a direct and engaging driving experience. Compared to potential future upgrades like the V8 engines offered in later Broncos, the 3.3-liter engine prioritized fuel economy and reliability over outright performance. The relatively low horsepower and torque figures meant that the Bronco I 3.3 was best suited for light-duty tasks and recreational off-roading, rather than high-speed highway cruising or heavy towing.
Equipment & Trim Levels
The Bronco I 3.3 was typically offered with a basic level of equipment, reflecting its position as the entry-level model. Standard features included a basic vinyl interior, a simple dashboard layout, and minimal exterior trim. Options were available, such as upgraded upholstery, a heater, and a radio. The Bronco’s interior was designed for practicality and durability, with easily cleanable surfaces and a focus on functionality. The exterior typically featured minimal chrome trim and a utilitarian appearance. The emphasis was on providing a rugged and capable vehicle at an affordable price point.
Chassis & Braking
The Bronco I utilized a body-on-frame construction, providing a robust and durable chassis. The suspension consisted of leaf springs in the front and rear, offering a comfortable ride on paved roads and sufficient articulation for off-road use. The front brakes were ventilated discs, providing adequate stopping power, while the rear brakes were drums. This combination was typical for vehicles of this era. The Bronco’s relatively short wheelbase (2337 mm / 92.01 in) contributed to its maneuverability in tight spaces and off-road trails. Ground clearance of 201 mm (7.91 in) further enhanced its off-road capability.
Market Reception & Comparison
The Bronco I 3.3 was generally well-received by critics and buyers alike. It was praised for its ruggedness, affordability, and off-road capability. However, its relatively slow acceleration and basic level of equipment were also noted. Compared to other trims in the Bronco lineup, such as those equipped with the larger six-cylinder or V8 engines, the 3.3-liter variant offered a more economical option for buyers who prioritized fuel efficiency and affordability over outright performance. Its fuel economy, while not exceptional, was reasonable for a four-wheel-drive vehicle of its size and era. Reliability was generally good, thanks to the engine’s simple design and robust construction.
Legacy
The Ford Bronco I 3.3 remains a popular choice among classic car enthusiasts and off-road enthusiasts today. Its simple design and robust construction make it relatively easy to maintain and repair. While not as powerful or refined as some of its siblings, the 3.3-liter engine is known for its durability and longevity. The Bronco I 3.3’s legacy is as a capable and affordable four-wheel-drive vehicle that helped establish the Bronco as an iconic American brand. In the used car market, well-maintained examples of the Bronco I 3.3 can command respectable prices, reflecting their enduring appeal and historical significance.
