A technical overview and history of the MG TA and TB type
1938 MG TA Series Engine: 4 cyl 1292cc 10hp OHV fitted with twin 1 ¼” SU Brass bodied carbys and brass SU fuel pump. Wet cork clutch 4 speed gearbox with Synchromesh on 3rd and 4th gears only. Top speed: 80 mph. Number built: 3003. Price 222 pounds UK. The MG TA model still holds the record for taking the youngest ever winner of the Australian Grand Prix (Allan Tomlinson at 22 years of age) to victory in South Australia in 1939. With an average speed of 132km/h. The TA was replaced by the TB in May 1939 with the fitting of a smaller but more modern XPAG engine as fitted to the Morris 10 but in a higher tuned state and like the TA with twin SU carburettors. This 1250 cc unit featured a slightly less-undersquare 66.6 mm bore and 90 mm stroke and had a maximum power output of 54 hp (40 kW) at 5200 rpm. Available as either an open 2 seater or more luxurious Tickford drophead coupé, this is the rarest of the T type cars with only 379 made.
An overview courtesy of Wikipedia