MG Midget

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MG Midget
MG-Midget.jpg
Overview
Manufacturer BMC
Production 1961–80
226,001 produced
Assembly Abingdon, England,
Australia[1]
Body and chassis
Class Sports car
Body style 2-door roadster
Layout FR layout
Related Austin-Healey Sprite
Powertrain
Engine MkI: 948 cc (1 L) A-Series I4
MkII: 1,098 cc (1 L) A-Series I4
MkIII: 1,275 cc (1 L) A-Series I4
MkIV: 1,493 cc (1 L) Triumph I4
Dimensions
Wheelbase 80 in (2,032 mm)[2]
Length 137 in (3,480 mm)[2]
Width Mk I and II 54 in (1,372 mm)[2]
Mk III and 1500 55 in (1,397 mm)
Height 48.5 in (1,232 mm) (before springs enlarged for 1974 Rubber Bumper cars)
Curb weight 735 kg (1,620 lb) (approx)
Chronology
Predecessor MG TF

The MG Midget is a small two-seater sports car produced by the MG division of the British Motor Corporation from 1961 to 1979. It revived a famous name used on earlier models such as the MG M-type, MG D-type, MG J-type and MG T-type.

MG Midget MkI (1961–64)[edit]

The first version was essentially a slightly more expensive badge-engineered version of the Austin-Healey Sprite MKII and retained the quarter-elliptic sprung rear axle from the original Sprite. The engine was a 948 cc A-Series with twin SU carburettors producing 46 hp (34 kW) at 5500 rpm and 53 lbf·ft (72 Nm) at 3000 rpm. Brakes were 7-inch (178 mm) drums all round. A hard top, heater, radio and luggage rack were available as factory-fitted extras.

In October 1962 the engine was increased to 1098 cc, raising the output to 56 hp (42 kW) at 5500 rpm and 62 lbf·ft (84 Nm) at 3250 rpm, and disc brakes replaced the drums at the front. Wire spoked wheels became available.

The doors had no external handles or locks and the windows were sliding Perspex side-screens. A heater was an optional extra.

Production was 16,080 of the small-engined version and 9601 of the 1098.[3]

A car with the 948 cc engine was tested by the British magazine The Motor in 1962 and had a top speed of 87.9 mph (141.5 km/h) and could accelerate from 0-60 mph (97 km/h) in 18.3 seconds. A fuel consumption of 40.2 miles per imperial gallon (7.03 L/100 km; 33.5 mpg-US) was recorded. The test car cost £689 including taxes on the UK market.[2]

MG Midget MkII (1964–66)[edit]

Externally the main changes were to the doors, which gained wind-up windows, swivelling quarter lights, external handles and separate locks. The windscreen also gained a slight curvature and was retained in a more substantial frame. The hood (US – top), though modified, continued to have a removable frame that had to be erected before the cover was put on. The rear springs were replaced by more conventional semi-elliptic types which gave a better ride. The engine block was strengthened and larger main bearings were fitted, increasing the power to 59 hp (44 kW) at 5750 rpm and torque to 65 lbf·ft (88 Nm) at 3500 rpm.

A total of 26,601 were made.[3]

MG Midget MkIII (1966–74)[edit]

Round Wheel Arch MG Midget on Autotest

The engine now grew to 1275 cc using the development seen on the Mini-Cooper 'S'. Enthusiasts were disappointed that this was a de-tuned version of the 72 bhp @ 5800 rpm Cooper 'S' engine, giving only 65 hp (48 kW) at 6000 rpm and 72 lbf·ft (98 Nm) at 3000 rpm. A reduced compression ratio of 8.8:1 was used instead of the 9.75:1 employed on the Cooper S engine. The Midget used the 12G940 cylinder head casting that was common to other BMC 1300 cars, whereas the Cooper 'S' had a special head with extra-large valves: however, these valves caused many 'S' heads to fail through cracking between the valve seats. The detuned engine was used for reasons of model range placement – with the Cooper 'S' spec engine the Midget would have been faster than the more expensive MGB. The hydraulic system gained a separate master cylinder for the clutch. The hood was now permanently attached to the car, with an improved mechanism making it much easier to use. In late 1967 (1968 model year), US-spec cars received several safety additions: a padded fascia (dashboard) with smaller main gauges; collapsible steering column, scissor-type hood hinges, a third windshield wiper, additional side marker lights, and anti-burst door latches. The rear axle gear ratio was increased from 4.22:1 to 3.9:1, giving 16.5 mph for every 1000 RPM. This increased final drive ratio gave the 1275 model slightly better fuel economy than the 1098 model. There were minor facelift changes to the body trim in late 1969 (1970 model year), with the sills painted black, a revised recessed black grille, and squared off taillights as on the MGB. 13" Rubery Owen "Rostyle" wheels were standardized but wire spoked ones remained an option.

In August 1971 the compression ratio on North American engines was reduced to 8.0:1. Engine power output fell to 54.5 bhp @ 5500 RPM and 67 lb-ft of torque @ 3250 RPM.

The square-shaped rear wheel arches became rounded in January 1972. Also in this year, a Triumph steering rack was fitted, giving a gearing that was somewhat lower than earlier Midgets. A second exhaust silencer was also added in 1972. Alternators were fitted instead of dynamos from 1973 onwards.

For 1974 model year, oversized rubber bumper blocks, nicknamed "Sabrinas" after the well-endowed British actress, were added to the chrome bumpers to meet the first US bumper impact regulations.

Many consider the round-arch Midgets with chrome bumpers produced for model years 1972 and 1973 to be the most desirable. These round-arch cars started leaving the Abingdon factory in late 1971.

Between 1966 and the 1969 face lift 22,415 were made, and a further 77,831 up to 1974.[3]

MG Midget 1500 (1974–80)[edit]

1976 MG Midget 1500

To meet US federal regulations, large black plastic bumpers (usually called rubber bumpers, despite not actually being rubber) were added to the front and rear and the ride height was increased. The increased ride height affected handling, and an anti-roll bar was added to help with higher centre of gravity. The A-Series engine was replaced by the 1493 cc unit from the Triumph Spitfire and a modified Morris Marina gearbox with synchromesh on all four gears. The increased displacement of the new engine was better able to cope with the increasing emission regulations. Although the horsepower ratings were similar (65 bhp – home market) the 1493 cc engine produced more torque. The increased output combined with taller gear ratios resulted in faster acceleration (12 seconds 0–60 compared to 13 for the 1275 cc version) and top speed of just over 100 mph. In the US market British Leyland struggled to keep engine power at acceptable levels, as the engines were loaded with air pumps, EGR valves and catalytic converters to keep up with new US and California exhaust emission control regulations. The home market's dual SU HS4 carbs were swapped for a single Zenith-Stromberg 150 CD4 unit, and the power fell to 50 bhp at 5000 RPM and 67 lb-ft of torque at 2500 RPM. The round rear-wheel arches were now square again, to increase the body strength.[4] The last car was made on 7 December 1979, after 73,899[5] of the last version had been made. The last 500 home-market cars were painted black. A least number of MG Midgets were titled in 1980, and appear as 1980 models.

ADO34[edit]

Mini-based MG Midget concept car that never made it to production. (Photo taken in 2003 at the Heritage Motor Centre in Gaydon)

ADO34 was the name of a project active between 1960 and 1964 that aimed to possibly develop a front-wheel drive Mini-based roadster as a possible new MG Midget or Austin-Healey Sprite. Following the launch of the MG Midget in 1961, it was considered as a possible MG Midget or Austin Healey Sprite replacement.[6] The project was cancelled in about 1964.

MG Midget Racing Coupes[edit]

MG racing driver Richard William Jacobs (AKA Dick Jacobs) ordered a pair of special lightweight Midgets with a GT body shape borrowed from the Aston Martin DB4. The nose was redesigned by Syn Enever to maximize the aerodynamics. Wind tunnel tests showed that the new body required 13 hp less to achieve 100 mph than the standard body shape. The cars were registry numbers BJB 770, and BJB 771. A third car was constructed for John Milne of Scotland. The cars were campaigned from 1962 to 1964 with a 995cc BMC A-Series engine. For the 1964 season the engines were replaced with a 1139cc engine derived from the then current 1098cc MG Midget block, and a 1287cc block derived from the Mini Cooper S (for the prototype events). They were fitted with 18.5 gallon fuel tanks, larger oil coolers, large bore exhaust systems, and dual channel brake systems.[7]

References[edit]

  1. ^ 1969 Mk 3 MG Midget Retrieved on 30 March 2012
  2. ^ a b c d "The M.G. Midget". The Motor. 28 March 1962. 
  3. ^ a b c Sedgwick, M. (1986). A-Z of Cars 1945–1970. Bay View Bookz. ISBN 1-870979-39-7. 
  4. ^ Sports Car Market, October 2007.
  5. ^ Robson, G. (2006). A-Z of British Cars 1945–1980. Herridge. ISBN 0-9541063-9-3. 
  6. ^ Projects ADO34, 35 and 36.
  7. ^ Jacobs, Dick, An MG Experience, © 1976 Transport Bookman Publications

Further reading[edit]