1967-1979 Austin Mini MK I 850 (34 Hp)

The Austin Mini MK I 850, produced from 1967 to 1979, represents an entry-level variant within the iconic Mini MK I range. It was a crucial model for broadening the Mini’s appeal, offering a more affordable and economical option compared to the higher-spec Cooper models. The 850 designation refers to its engine displacement, and this version played a significant role in establishing the Mini as a mainstream vehicle, particularly in the United Kingdom and export markets. While the original 1959 Mini was revolutionary, the 850 offered a more accessible price point for a wider customer base, solidifying its place in automotive history.

Technical Specifications

Powertrain & Engine Architecture

The heart of the Mini MK I 850 is its 848cc inline-four cylinder engine. This engine, internally designated as the A-Series, was a significant downsize from the original 997cc unit, contributing to the 850’s lower price. It featured a cast iron block and cylinder head, with a single camshaft operating the valves via pushrods and rockers. The engine utilized a single SU carburetor for fuel delivery, a relatively simple system that prioritized reliability and ease of maintenance over outright performance. The 34 horsepower output was achieved at 5,700 rpm, and peak torque of approximately 55 lb-ft was available at 3,500 rpm. The engine was mated to a four-speed manual gearbox, known for its characteristic ‘crash-first’ engagement. The transmission was directly integrated into the engine casing, a space-saving design that was a hallmark of the original Mini. The 850’s engine, while modest in power, was remarkably durable and capable of high mileage with regular servicing.

Driving Characteristics

The Mini MK I 850 offered a unique driving experience. Its small size and lightweight construction (around 1,570 lbs) made it incredibly nimble and fun to drive, especially on winding roads. However, the 34 horsepower engine meant acceleration was leisurely, particularly when fully loaded. Top speed was around 72 mph, but cruising at highway speeds required considerable effort. The gear ratios were relatively short, designed to keep the engine within its optimal power band. The steering was direct and responsive, providing excellent feedback to the driver. The suspension, featuring rubber cone springs and dampers, provided a surprisingly comfortable ride, absorbing bumps and imperfections in the road surface effectively. Compared to the Cooper models, the 850 felt noticeably slower, especially in terms of acceleration and hill-climbing ability. The manual gearbox, while engaging, required a firm hand and precise timing for smooth shifts.

Equipment & Trim Levels

The Mini MK I 850 was deliberately kept simple in terms of equipment to maintain its affordability. Standard features included basic cloth upholstery, a simple dashboard with minimal instrumentation (speedometer and fuel gauge), and manually operated windows. The interior was functional rather than luxurious, with a focus on practicality. Exterior trim was also minimal, with basic chrome bumpers and simple hubcaps. Optional extras included a heater, a radio, and upgraded upholstery. The 850 typically featured steel wheels, while the Cooper models often came with wider wheels and tires for improved handling. Interior color options were limited, typically consisting of shades of grey, blue, and red. The overall aesthetic was one of understated British charm.

Chassis & Braking

The Mini MK I 850 utilized a monocoque chassis construction, a revolutionary design at the time that maximized interior space while minimizing weight. The front suspension featured independent wishbones and hydraulic dampers, while the rear suspension employed a subframe-mounted trailing arm setup with rubber cone springs. The braking system consisted of drum brakes on all four wheels, which were adequate for the car’s weight and performance. However, they lacked the stopping power of disc brakes, which were reserved for the Cooper models. Steering was rack and pinion, providing precise and responsive control. The 850’s relatively small wheelbase and narrow track contributed to its nimble handling characteristics. Stabilizer bars were not typically fitted to the 850, further differentiating it from the more performance-oriented Cooper variants.

Market Reception & Comparison

The Mini MK I 850 was generally well-received by the motoring press as an affordable and practical city car. Critics praised its fuel economy (around 45-50 mpg) and its surprisingly spacious interior for its size. However, the limited power output was a common criticism, particularly for those accustomed to larger, more powerful vehicles. Compared to the Mini Cooper, the 850 offered significantly less performance but at a considerably lower price. The Cooper, with its 76 hp engine, provided a much more exhilarating driving experience, but it also came with a higher price tag and increased running costs. The 850 was often seen as a sensible choice for first-time car buyers or those seeking an economical and reliable mode of transportation. Its simplicity and ease of maintenance also appealed to many owners.

Legacy

The Austin Mini MK I 850 remains a beloved classic car today. Its simple design and robust engine make it relatively easy to maintain, and parts availability is generally good. While not as sought-after as the Cooper models, the 850 offers an affordable entry point into the world of classic Mini ownership. The 850’s engine, while modest in power, is known for its durability and longevity. Well-maintained examples can still provide years of reliable service. In the used car market, prices for the 850 vary depending on condition and originality, but they generally remain significantly lower than those of the Cooper models. The Mini MK I 850’s enduring popularity is a testament to its innovative design, its charming character, and its lasting appeal as a symbol of 1960s British motoring.