This 1938 Nash is unusual not because of the car it was when new, but because of what was later fitted to it. Mounted prominently on the front mudguard is a gas producer, a system that allowed a petrol engine to run on combustible gas made from solid fuel.

Producer-gas vehicles became especially important during the Second World War, when petrol supplies were restricted and motorists had to find other ways to keep vehicles operating.

A Different Kind of Fuel

The gas producer works by heating solid fuel with a limited supply of air. Instead of allowing the fuel to burn completely, the process creates a combustible gas that can be fed into the engine.

The engine then burns this gas in place of petrol. It was not as convenient or powerful as conventional petrol operation, but during wartime shortages it provided a practical alternative.

In New Zealand, specially prepared fuel known as “char” was used in producer-gas systems.

Why New Zealand Used Producer Gas

During the Second World War, imported petrol was heavily rationed. New Zealand depended on overseas fuel supplies, making conservation essential.

Producer gas offered one way of reducing that dependence. Cars, trucks and other vehicles could be converted to operate using locally available solid fuels, allowing essential transport to continue while petrol was reserved for higher-priority uses.

The equipment was bulky and required extra preparation, but under wartime conditions those disadvantages were accepted.

How This Car Is Set Up

On this Nash, the gas producer is mounted on the right front mudguard, where it is clearly visible beside the bonnet.

Filtering equipment is fitted on the opposite side. The gas created in the producer must be cooled and cleaned before it reaches the engine, because ash, dust and other contaminants could otherwise cause damage.

The prominent external equipment gives the car a very different appearance from a standard 1938 Nash Sedan.

About 30 Miles on a Fill

Museum records indicate that one fill of char could provide this car with approximately 30 miles of travel.

That figure gives a useful idea of the compromises involved. A producer-gas vehicle required frequent refuelling, careful operation and more attention from the driver than a petrol-powered car.

Even so, when petrol was difficult to obtain, the ability to travel using locally produced solid fuel was extremely valuable.

The Nash Beneath the Equipment

The car itself dates from 1938 and is powered by a substantial six-cylinder engine producing approximately 105 horsepower.

Nash had developed a reputation for comfortable and well-engineered cars, and its sedans were designed for practical family and long-distance motoring.

The large engine and roomy body make this Nash a particularly striking platform for demonstrating a producer-gas conversion.

Originally Petrol Powered

This car did not leave the Nash factory with a gas producer.

It was originally built as a conventional petrol-powered sedan. The producer-gas equipment was later fitted by Southward Car Museum to demonstrate the type of conversion used on New Zealand roads during wartime fuel shortages.

That distinction is important. The equipment represents a historically accurate method of keeping petrol vehicles operating, but it is a later interpretive conversion rather than part of the car’s original 1938 factory specification.

Driving on Producer Gas

Operating a producer-gas vehicle required considerably more effort than simply starting a petrol engine.

The solid fuel had to be loaded into the producer and brought to the correct operating condition before useful gas could be generated. The gas then passed through filtering and cooling equipment before reaching the engine.

Performance was generally reduced compared with petrol, and drivers had to manage the system carefully. The inconvenience was significant, but the technology served an important purpose when conventional fuel was scarce.

A Visible Reminder of Wartime Motoring

One of the most valuable aspects of this car is that the gas-producing equipment is impossible to miss.

Rather than hiding the technology inside the vehicle, the large producer and filtering apparatus visibly demonstrate how dramatically a conventional car could be altered in response to fuel shortages.

It helps turn an abstract story about wartime rationing into something visitors can see and understand immediately.

This Car

This 1938 Nash Sedan represents two different periods of motoring history at once. Beneath the additional equipment is a substantial pre-war American passenger car, while the gas producer demonstrates the ingenuity used in New Zealand when petrol became difficult to obtain.

Although the conversion was fitted later by Southward Car Museum, it accurately illustrates the type of alternative-fuel technology once seen on New Zealand roads.

The result is a powerful reminder that wartime motoring was shaped not only by the cars people owned, but by the fuels they could actually get.