A NEW WAY OF WARMING MOTOR CARS.

Otago Witness, Issue 3487, 11 January 1921, Page 21

A NEW WAY OF WARMING MOTOR CARS.

Many attempts have been made to use the waste heat of a motor car engine for warming the body of the car, but nearly all the devices hitherto tried for,this purpose have had serious drawbacks. For example, if acme of the hot exhaust gases are passed through heating coils in the car body, the engine power would be diminished by back pressure, the temperature would depend on the output of the engine, and there would be a. risk of unpleasant or dangeorus escapes of gas. These and other drawbacks are avoided in a new device brought out by a, British company. The exhaust operates an ejector which draws air through a combined silencer and air heater and through a nest, of tubes in the car body. When the load on the engine is heavy and more exhaust, gas is being passed, the ejector draws in more air and so. keeps the temperature from rising above a limit, which is determined by the design of the apparatus, at several degrees below boiling point. There is no risk of gas leaking into theibar, bo-ca-use the ejector creates a partial vacuum in the system and thus causes air to be drawn inwards through anv leaks which may happen to be present. The tubes get hot within five minutes after starting the engine, but they never get-hot enough to “burn” the air and cause an unpleasant smell.