Crosley CoBra Engine: The 59-Pound Motor That Dissolved in American Driveways

In the 1940s, Crosley tried to do something Detroit thought was impossible.

Instead of building a heavy cast-iron engine block, they made one from thin stamped steel, copper-brazed together in a furnace.

It was called the Crosley CoBra Engine.

At just 59 pounds, this tiny overhead-cam motor looked like a manufacturing miracle. It had proven itself during World War II, powered military generators, and promised to give working Americans an affordable car that could deliver incredible fuel economy.

But once it reached civilian driveways, the miracle began to fail in a way almost nobody expected.

The problem was not horsepower. It was not rods, valves, or crankshafts. It was something far more ordinary: American tap water.

This is the story of the Crosley CoBra Engine — the featherweight motor that tried to bypass the iron foundry, stunned mechanics with its radical design, and became one of the strangest failures in American automotive history.

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