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MG J-type

(Redirected from MG J3)

The MG J-type is a sports car that was produced by MG from 1932 to 1934. This 2-door sports car used an updated version of the overhead camshaft, crossflow engine, used in the 1928 Morris Minor and Wolseley 10 and previously fitted in the MG M-type Midget of 1929 to 1932, driving the rear wheels through a four-speed non-synchromesh gearbox. The chassis was from the D-Type with suspension by half-elliptic springs and Hartford friction shock-absorbers all round with rigid front and rear axles. The car had a wheelbase of 86 in (2,184 mm) and a track of 42 in (1,067 mm). Most cars were open two-seaters, but a closed salonette version of the J1 was also made, and some chassis were supplied to external coachbuilders. The open cars can be distinguished from the M type by having cut-away tops to the doors.[1]

MG J-Type
Overview
ManufacturerMG
Production1932–1934
2,494 made
Body and chassis
Classsports car
Body style2-door roadster
Salonette
LayoutFR
Chronology
PredecessorMG C-type, D-type and M-type Midgets
SuccessorMG P-type Midget

J1

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MG J1
Overview
Production1932–1933
380 made
Powertrain
Engine847 cc I4
Dimensions
Wheelbase2,184 mm (86 in)[2]

The J1 was the four-seat car in the range. The engine was the 847 cc unit previously seen in the C-type with twin SU carburetors giving 36 bhp. The car cost £220 in open and £225 in Salonette form.[3]

J2

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MG J2
 
1933 MG J2
Overview
Production1932–1934
2,083 made
Powertrain
Engine847 cc I4
Dimensions
Wheelbase2,184 mm (86 in)[2]

The J2, a road-going two-seater, was the commonest car in the range. Early models had cycle wings, which were replaced in 1933 by the full-length type typical of all sports MGs until the 1950s TF. The top speed of a standard car was 65 mph (105 km/h),[3] but a specially prepared one tested by The Autocar magazine reached 82 mph (132 km/h). The car cost £199.[1]

The most serious of the J2's technical failings is that it has only a two-bearing crankshaft which may break if over-revved. The overhead camshaft is driven by a vertical shaft through bevel gears, which also forms the armature of the dynamo. Thus any oil leak from the cambox seal goes into the dynamo brushgear, presenting a fire hazard.

Rather than hydraulic brakes the car has Bowden cables to each drum. Although requiring no more pedal force than any other non-power-assisted drum brake if they are well maintained, the drums themselves are small, and even in-period it was a common modification to replace them with larger drums from later models.

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    Rear view

J3

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MG J3
 
Overview
Production1932–1933
22 made
Powertrain
Engine746 cc SC I4
Dimensions
Wheelbase2,184 mm (86 in)[2]

The J3 was a racing version with the engine capacity reduced to 746 cc by shortening the stroke from 83 to 73 mm[1] and fitted with a Powerplus supercharger. The smaller engine capacity was to allow the car to compete in 750 cc class racing events. Larger brakes from the L-type were fitted.[3]

J4

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MG J4
 
Overview
Production1932–1933
9 made
Powertrain
Engine746 cc SC I4
Dimensions
Wheelbase2,184 mm (86 in)[2]

The J4 was a pure racing version with lightweight body work and the J3 engine, but using more boost from the supercharger to obtain 72 bhp (54 kW).

References

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  1. ^ a b c Green, Malcolm (1997). MG Sports Cars. Godalming UK: CLB International. ISBN 1 85833 606 6.
  2. ^ a b c d Aspden, Richard (1983). The Classic MG. p. 94. ISBN 0861241096.
  3. ^ a b c Sedgwick, Michael; Gillies, Mark (1993). A-Z of Cars of the 1930s. Bay View Books. ISBN 978-1-870979-38-2.
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