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MG T-type

(Redirected from MG TB)

The MG T-Type is a series of body-on-frame open two-seater sports cars that were produced by MG from 1936 to 1955. Known as the Midget, the series, included the TA, TB, TC, TD, and TF models. Although the design was contemporary in the 1930s, it had grown outdated by the 1950s, and was replaced by the all new MGA in 1955.

MG T-type
MG TA Midget
Overview
ManufacturerMG (Morris, later BMC)
Production1936–1955
AssemblyAbingdon, Oxfordshire, England
Body and chassis
ClassSports car
LayoutFR layout
Powertrain
Transmission4-speed manual
Dimensions
Wheelbase94 in (2,388 mm)
Chronology
PredecessorMG PB
SuccessorMGA

The TF name was reinstated in 2002 on the mid-engined MG TF sports car.

TA Midget

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TA Midget
 
1939 TA open 2-seater
Overview
Production1936–1939
Body and chassis
Body styleopen 2-seater / roadster
Airline coupé
Tickford drophead coupé.
Powertrain
Engine1,292 cc (1.3 L) MPJG I4
Dimensions
Length140 in (3,556 mm)
Width56 in (1,422 mm)

The TA Midget replaced the PB in 1936.[1] It was an evolution of the previous car and was 3 inches (76 mm) wider in its track at 45 inches (1,100 mm) and 7 inches (180 mm) longer in its wheelbase at 94 inches (2,400 mm).

The previous advanced overhead-cam inline-four engine was by then not in use by any other production car so it was replaced by the MPJG OHV unit from the Wolseley Ten, but with twin SU carburettors, modified camshaft and manifolding. The engine displaced just 1292 cc, with a stroke of 102 mm (4.0 in) and a bore of 63.5 mm (2.5 in) and power output was 50 hp (40.3 kW) at 4,500 rpm. The four-speed manual gearbox gained synchromesh on the two top ratios and was connected to the engine by a cork-faced clutch running in oil. Unlike the PB, hydraulic brakes were fitted with 9-inch (230 mm) drums.

 
1938 TA in competition, Italy 2015

Like the PB, most were two-seat open cars with a steel body on an ash frame. A bench-type seat was fitted with storage space behind.

The T-type was capable of reaching almost 80 mph (130 km/h) in standard tune with a 0–60 mph time of 23.1 seconds.[2] Allan Tomlinson won the 1939 Australian Grand Prix handicap driving an MG TA.

3,003 were made and in 1936 it cost £222 on the home market, the same as the PB.

When first introduced the model was known as the T Type and only after the advent of the TB did the TA designation come into use.[3]

Tickford drophead coupé

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From 1938 the car could also be had with a more luxurious Tickford drophead coupé body by Salmons of Newport Pagnell, and 252 were made.[2] The soft top could be used in three positions, fully open, closed or open just over the seats. Wind-up windows were fitted to the higher topped doors making the car more weathertight and individual bucket seats used in the fully carpeted interior. Complete chassis were fitted with a very basic body at the Abingdon factory and driven to Newport Pagnell to have their coachwork fitted.

Airline fixed head coupé

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TA Airline coupé
 
Allan Tomlinson won the 1939 Australian Grand Prix driving a TA

A closed Airline coupé made by Carbodies, as fitted to the P type, was also offered but only one or two are thought to have been made.

TB Midget

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TB Midget
 
1939 open 2-seater
Overview
Production1939–1940
Body and chassis
Body styleopen 2-seater / roadster
Tickford drophead coupé
Powertrain
Engine1,250 cc (1.3 L) XPAG I4
Dimensions
Length140 in (3,556 mm)
Width56 in (1,422 mm)

The TA was replaced by the TB Midget in May 1939. It had a smaller but more modern XPAG engine as fitted to the Morris Ten Series M, but in a more highly tuned state and like the TA with twin SU carburettors. This 1250 cc straight-four unit featured a slightly less undersquare 66.6 mm (2.6 in) bore and 90 mm (3.5 in) stroke and had a maximum power output of 54 hp (40 kW) at 5200 rpm. The oil-immersed clutch was also replaced by a dry-plate type and gear ratios revised.[citation needed]

Available as an open two-seater or more luxurious Tickford drophead coupé, this is the rarest of the T-type cars, as production began just prior to Britain's entry into World War II.[citation needed] Only 379 TBs were made before the MG factory emptied its buildings and switched to making major aircraft components and modifying tanks.[4]

 
1939 TB, Gran Premio Nuvolari 2015
 
1939 Tickford drophead coupé

TC Midget

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TC Midget
 
1947 TC
Overview
Production1945–1950
Body and chassis
Body styleopen 2-seater / roadster
Powertrain
Engine1,250 cc (1.3 L) XPAG ohv I4[5]
Dimensions
Length140 in (3,556 mm)
Width56 in (1,422 mm)
Height53 in (1,300 mm)[5]

The TC Midget was the first postwar MG,[1] and was launched in 1945. It was quite similar to the pre-war TB, sharing the same 1,250 cc (76 cu in) pushrod-OHV engine with a slightly higher compression ratio of 7.4:1 giving 54.5 bhp (40.6 kW) at 5200 rpm. The makers also provided information for several alternative stages of tuning for "specific purposes".[5] The XPAG engine is well known for its tunability. The TC engine was a slightly improved version of the XPAG first introduced to MG in the TB. Notable improvement was through the addition of a hydraulically (oil pressure) adjusted timing chain tensioner. All TCs utilized a (single battery) 12 volt electrical system. All TCs came with 19" Dunlop wire wheels. Automatic mechanical timing advance was built into the ignition distributor.

It was exported to the United States, even though the car was only ever built in right-hand drive.[6] The export version had slightly smaller US specification sealed-beam headlights (7-inch buckets) and twin tail lights, as well as turn signals and chromed front and rear bumpers with over riders.

The body was approximately 4 inches (100 mm) wider than the TB measured at the rear of the doors to give more cockpit space. The overall car width remained the same resulting in narrower running boards with two tread strips as opposed to the previous three. The tachometer was directly in front of the driver, while the speedometer/odometer was on the other side of the dash in front of the passenger, a nod to MG's trials history.

10,001 TCs were produced, from September 1945 (chassis number TC0251) to November 1949 (chassis number TC10251), more than any previous MG model.[6] It cost £527 on the home (UK) market in 1947.

Fuel consumption was 28 mpg‑imp (10.1 L/100 km; 23.3 mpg‑US).[7] Its 0–60 mph time was 22.7 seconds, a respectable performance at the time.[7] A low fuel warning light would glow on the dash to alert the driver.

 
1948 TC with full weather protection
 
1948 TC with aero screens in position and windscreen flat
 
TC engine bay

TD Midget

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TD Midget
 
1953 TD
Overview
Production1950–1953
Body and chassis
Body styleopen 2-seater / roadster
Powertrain
Engine1,250 cc (1.3 L) XPAG I4
Dimensions
Wheelbase94 in (2,388 mm)[8]
Length145 in (3,683 mm)[8]
Width59 in (1,499 mm)[8]
Height53 in (1,346 mm) [8]

The TD Midget, announced in January 1950,[9] combined the TC's drivetrain, a modified hypoid-geared rear axle, the MG Y-type chassis, a familiar T-type style body and independent suspension on front axle using coil springs from the MG Y-type saloon: a 1950 road-test report described as "most striking" the resulting "transformation ... in the comfort of riding".[10] The entire drivetrain was not lifted from the TC; along with the new hypoid differential, a completely different transmission was used (albeit also a four-speed). Also lifted from the company's successful 1¼-litre saloon was the (still highly geared) rack and pinion steering.[10] In addition the TD featured smaller 15-inch (380 mm) disc type road wheels, a left-hand drive option and standard equipment bumpers and over-riders. The car was also 5 inches (130 mm) wider with a track of 50 inches (1,300 mm). It was seen by enthusiasts at the time as a disappointment, mild and "not a sports car", instead "largely designed to consolidate and expand the car's sale in North America."[9] The first TDs were built in late 1949.

For the driver the "all-weather protection" was good by the standards of the time.[10] For night driving, instrument illumination was "effective but not dazzling, by a pale green lighting effect".[10] There was still no fuel gauge, but the 12 imp gal (14.5 US gal; 54.5 L) of tank capacity gave a range between refuelling stops of about 300 miles (480 km) and a green light on the facia flashed a "warning" when the fuel level was down to about 2.5 imp gal (3 US gal; 11.5 L).[10]

In 1950 the TD MkII Competition Model was introduced, produced alongside the standard car, with a more highly tuned engine using an 8.1:1 compression ratio giving 57 bhp (43 kW) at 5,500 rpm. The higher compression ratio engine was offered with export markets in mind, and would not have been suitable for the UK, where carryover wartime restrictions limited fuel to 72 octane "pool petrol". The TD MkII also featured twin fuel pumps, additional Andrex dampers, and a higher ratio rear-axle.

Nearly 30,000 TDs had been produced, including about 1700 Mk II models, when the series ended in 1953 with all but 1656 exported, 23,488 of them to the US alone.[2] The main complaint that US owners had with the MG TD sold in the US was the British 12-volt electrical system, which was hard to service when most US cars were still using 6 volts. Also, they had minor complaints over the lack of water temperature and fuel gauges. But in general in surveys, owners of the Americanised MG TD had more positive remarks than negative.[11] The 0–60 mph (97 km/h) time was 22.7 seconds according to Popular Mechanics.[12]

An example tested by The Motor magazine in 1952 had a top speed of 77 mph (124 km/h) and could accelerate from 0–60 mph (97 km/h) in 18.2 seconds. A fuel consumption of 26.7 miles per imperial gallon (10.6 L/100 km; 22.2 mpg‑US) was recorded.[8]

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    1953 TD instrument panel
  •  
    1953 TD engine bay
  •  
    1953 TD badge

In 1998, the rights, intellectual properties and trademarks associated with the production of the MG TD were acquired by TD Cars Sdn Bhd in Malaysia to reproduce the TD series as TD2000.

TF and TF 1500 Midget

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TF Midget
 
1954 MG TF 1250
Overview
Production1953–1955
Body and chassis
Body styleopen 2-seater / roadster
Powertrain
Engine
  • 1,250 cc (1.3 L) XPAG I4
  • 1,466 cc (1.5 L) XPEG I4
Dimensions
Length147 in (3,734 mm)
Width59 in (1,499 mm)
Height52.5 in (1,334 mm)[5]

The TF Midget, launched on 15 October 1953,[13] was a facelifted TD,[14] fitted with the TD Mark II engine, headlights faired into the wings, a sloping radiator grille concealing a separate radiator, and a new pressurised cooling system along with a simulated external radiator cap.[1] This XPAG engine's compression ratio had been increased to 8.1:1 and extra-large valves with stronger valve springs and larger carburettors increased output to 57.5 bhp at 5,500 rpm.[13]

 
MG TF 1500 showing enamel plate

In mid-1954 the engine capacity was increased by 17 per cent to 1466 cc and designated XPEG. The bore was increased to 72 mm (2.8 in) and compression raised to 8.3:1 giving 63 bhp (47 kW) at 5,000 rpm and a 17 per cent increase in torque. The car was designated TF1500, and externally distinguished by a cream background enamel nameplate on both sides of the bonnet, placed just to the rear of the forward bonnet-release buttons.

Production ended at chassis number TF10100 on 4 April 1955 after 9,602 TFs had been manufactured, including two prototypes and 3,400 TF1500s. The TF was superseded by the all new MGA.

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    MG TF 1500, rear view
  •  
    Octagonal instrument bezels in a TF 1500

See also

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References

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Notes

  1. ^ a b c "MG T-Series", The Background to the T-Series, www.mgcars.org.uk, archived from the original on 5 August 2011, retrieved 17 July 2011
  2. ^ a b c Green (1997)
  3. ^ "Basic Information on M.G.'s First T Series Midget", The M.G. TA, www.billdavis.org, retrieved 19 July 2011
  4. ^ MG in WW2 accessed 28 December 2018
  5. ^ a b c d "Second Hand car guide supplement". Practical Motorist. 6 Nbr 68: 768–769. April 1960.
  6. ^ a b Cheetham, Craig (2004). Vintage Cars – The Finest Prewar Automobiles. Rochester, United Kingdom: Grange Books. p. 149. ISBN 1840136359.
  7. ^ a b Willson (1995)
  8. ^ a b c d e "The M.G. Midget Series TD Road Test". The Motor. 8 October 1952.
  9. ^ a b "New M.G. Midget Car". The Times. No. 51593. 19 January 1950. p. 3.
  10. ^ a b c d e "M.G. Midget Series TD Two-Seater". Autocar. 20 January 1950.
  11. ^ "The Owner's Report on the MG." Popular Mechanics, June 1952, pp. 89-92/240.
  12. ^ Popular Mechanics – Google Boeken. Hearst Magazines. June 1952. Retrieved 6 October 2012.
  13. ^ a b "New M.G.Cars". The Times. No. 52754. 16 October 1953. p. 5.
  14. ^ Culshaw, David; Horrobin, Peter (2013) [1974]. "MG". The complete catalogue of British Cars 1895 – 1975 (Paperback ed.). Poundbury, Dorchester, UK: Veloce Publishing. pp. 212–213. ISBN 978-1-874105-93-0. Retrieved 6 December 2013. The TC Midget was ... announced in 1945, and its successor, the TD of 1950, though at first received with horror by enthusiasts on account of its specification, which actually included independent front suspension and even bumpers, is now ... revered and sought after.... The last of the traditionally-styled MGs, the TF, came in 1953 and was built in both 11⁄4- and 11⁄2-litre form.

Bibliography

Further reading

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  • Holmes, Mark (2007). Ultimate Convertibles: Roofless Beauty. London: Kandour. pp. 102–105. ISBN 978-1-905741-62-5.
  • Jones, Barrie (2005), Barrie's Notes – Maintaining a 1955 MG TF in the 21st Century, The Printing Press, ISBN 0-9546974-2-1
  • Sedgwick, Michael; Gillies, Mark (1989), A-Z of Cars of the 1930s, Bay View Books, ISBN 1-870979-38-9
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