The SA started its life with an engine of 2062cc against the 2664cc in the Jaguar, giving the latter a nearly 30 bhp advantage in a car that weighed the same. The Jaguar did get bigger and heavier in 1938 when coach-built construction gave way to all steel, but despite a couple of capacity increases the SA was always inferior in power to weight ratio. The introduction of the WA did improve matters for MG, but this car had also gained size and weight and was still at a disadvantage in power to weight ratio relative to the 2½ litre Jaguar. It had also risen in price to £442 putting it very close to the even more powerful 3½ litre Jaguar which could be bought for £445.
