1966-1980 MG MGB GT 1.8 (92 Hp)

The MG B GT 1.8, producing 92 horsepower, represents a significant evolution within the iconic MGB lineage. Produced from 1966 through 1980, this variant of the MGB GT offered a blend of classic British sports car styling with a more modern, albeit still relatively simple, engine. It occupied a middle ground in the MGB range, offering more performance than the earlier 1.6-liter models but remaining more accessible than the later V8 versions. The GT, a fixed-roof coupe, provided a more refined and practical alternative to the traditional roadster, appealing to buyers seeking a comfortable and stylish grand tourer.

Technical Specifications

Powertrain & Engine Architecture

The 1.8-liter engine, designated as the 18V, was a significant upgrade from the earlier 1.6-liter MGB powerplant. It featured a cast iron block and cylinder head, with a five-main bearing crankshaft for improved durability. The engine utilized a single SU HS6 carburetor, responsible for fuel delivery. The valvetrain consisted of a single overhead camshaft operating pushrods to actuate the valves. While not a particularly high-revving engine, the 18V produced a respectable 92 horsepower at 5,500 rpm and 104 lb-ft of torque at 3,000 rpm. This torque improvement was particularly noticeable compared to the 1.6L engine.

The 1.8L engine was typically paired with a Borg Warner 3-speed automatic transmission. This transmission, while offering convenience, was not known for its performance or efficiency. It featured a torque converter and a relatively simple gear selection. The automatic transmission was a key differentiator for this variant, targeting drivers who preferred ease of use over the more engaging experience of a manual gearbox. The automatic transmission was not a particularly common option on the MGB, making this variant somewhat less frequently seen than its manual counterparts.

Driving Characteristics

The MGB GT 1.8 Automatic offered a comfortable and relaxed driving experience. The automatic transmission smoothed out gear changes, making it well-suited for cruising. However, the performance was noticeably less spirited than the manual transmission versions. The 3-speed automatic’s gear ratios were spaced to prioritize fuel economy and comfort over outright acceleration. The car felt somewhat sluggish when attempting quick overtaking maneuvers or climbing steep hills. The torque converter, while providing smooth launches, also sapped some power from the engine. Compared to the 4-speed manual, the automatic version resulted in a slower 0-60 mph time, typically around 12.5 seconds. The suspension, while providing a reasonably comfortable ride, was prone to body roll in corners, typical of British sports cars of the era. Steering was unassisted, requiring some effort at low speeds but providing good feedback.

Equipment & Trim Levels

The MGB GT 1.8 Automatic typically came equipped with a fairly standard set of features for the time. Standard interior appointments included vinyl upholstery, a wood-rimmed steering wheel, and basic instrumentation consisting of a speedometer, tachometer, fuel gauge, and temperature gauge. The GT’s fixed roof provided better weather protection and sound insulation than the roadster. Optional extras included wire wheels, overdrive (though less common with the automatic transmission), a radio, and upgraded interior trim materials. The trim levels were relatively simple; the 1.8 Automatic generally sat in the mid-range of the MGB GT lineup, offering a step up in performance from the base 1.6-liter models but lacking the luxury features of the later V8 versions. Interior color options were varied, allowing buyers to personalize their vehicles.

Chassis & Braking

The MGB GT utilized a traditional body-on-frame construction, with a separate chassis and body. The suspension consisted of independent front suspension with coil springs and a live axle rear suspension with leaf springs. The braking system was initially equipped with Dunlop disc brakes on the front wheels and drum brakes on the rear. Later models saw the introduction of disc brakes on all four wheels, improving stopping performance. The steering was a traditional rack and pinion system, providing reasonably precise control. Stabilizer bars were fitted to both the front and rear axles to reduce body roll. The chassis was relatively lightweight, contributing to the car’s nimble handling characteristics, despite the limitations of the suspension design.

Market Reception & Comparison

The MGB GT 1.8 Automatic received mixed reviews. Critics generally praised the engine’s increased power and torque compared to the 1.6-liter models, but the automatic transmission was often criticized for detracting from the sporty driving experience. Fuel economy was reasonable for the era, averaging around 22-25 mpg. Reliability was generally good, although the SU carburetor required periodic adjustment and maintenance. Compared to the manual transmission versions, the automatic was considered less engaging and slower. The V8-powered MGB GT, introduced later, offered significantly more performance but at a higher price point. The 1.8 Automatic appealed to buyers who prioritized comfort and convenience over outright performance, representing a more practical and accessible option within the MGB range.

Legacy

The MG B GT 1.8 Automatic, while not the most sought-after variant, holds a special place in the hearts of many enthusiasts. The 18V engine proved to be relatively durable, and many examples are still on the road today. The automatic transmission, while not known for its robustness, can be rebuilt and maintained with relative ease. In the used car market, the 1.8 Automatic typically commands a slightly lower price than the manual transmission versions, reflecting its less sporty character. However, its rarity and classic British charm make it a desirable vehicle for collectors and enthusiasts alike. The MGB GT 1.8 Automatic represents a unique blend of style, comfort, and affordability, embodying the spirit of the classic British sports car.