Nearly two years ago Pratt & Whitney motor experts flew for newsmen a plane equipped with what looked like an ordinary Wasp engine but which differed in an important respect: the engine had no carburetor, received fuel by direct injection into its cylinders. No more was heard of the experiment until last week when Pratt & Whitney announced that long-time tests had proved successful: a carburetorless Hornet engine of 525 h. p. had been installed in a Boeing mail plane for actual service. Advantages: direct fuel injection eliminates all carburetion troubles including the...
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