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.

The J3 was essentially a supercharged J2 but had a 750cc engine similar to the earlier C type and utilising the bore and stroke of the race prepared MG's but without a counterbalanced crankshaft. This size of engine was retained for all the racing Midgets until the arrival of the PB Midget.

1933 MG J3 technical specifications and data. Engine, horsepower, torque, dimensions and mechanical details for the 1933 MG J3. CO2, emissions, perfo...

On this site we collect information, photo's, drawings and refer to web-sites, which are a useful help by the restoration of MMM MG's. Midget’s, Magna’s and Magnette’s of the period 1929 to 1936.

The MG J3 was a more supercharged version of the J2 with an updated 750 cc displacement. This open sports 2 seater was designed specifically for the street, and small occasional trials work, only a rare 22 models were produced between 1932 and 1933.

The J3 was a racing version with the engine capacity reduced to 746 cc by shortening the stroke from 83 to 73 mm and fitted with 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.

The J3 and J4 are interesting, racing-focused models - the engine was downsized under 750cc to meet racing regulations, but was fitted with a supercharger and larger brakes to improve performance. A: The MG J-Type was sold for model years 1932 to …

The ultimate expressions of the original Midget engine, both used the 746cc cylinder dimensions and were supercharged. The J3 had a forged crank and a No 6A Powerplus blower, while the J4 was very heavily modified as an out and out racer.

Genuine historic 1932 MG J3 Supercharged Midget, chassis No 3755, Reg No OY 4189. 1933 Monte Carlo Rally and Mont de Mules hill climb car. Trials and Shelsley Walsh history. Winner of many races and sprint awards at Southport sands in both 2-seater and single seater form.

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