A water pump was added in 1953 for the 100E models when the engine was re-engineered to the point that few specifications are identical between the early and the later series.

Early further research and development were being carried out at the German Ford engine plant in Cologne to improve the engine for ease of use in the Taunus line of cars, including a 44 hp 1.5 developed from the 1172 cc for the Taunus G93A but this work was finally halted in 1942.

Many ways were explored to enhance the power output of the standard engine, most notably special exhaust manifolds, twin carburettors, stiffer valve springs, thinner cylinder head gaskets and modified camshafts.

The most hardcore performance tuning available was the Inlet Over Exhaust (IOE) cylinder head conversion from Willment and Elva, which could be built to produce 70+ BHP [1] The nominal horsepower quoted for each engine size comes from the British method of power calculation for road taxation purposes, and bears no relationship with the actual power output.

Several ways of improving the performance through modifications to the gearbox and transmission train were applied; replacement close ratio gears fitted to gearbox, overdrive gears fitted behind the original gearbox and higher ratio crown & pinion gears fitted to the differential unit on the back axle.