Excerpt from The Gasoline Automobile, Its Design and Construction, Vol. 1: The Gasoline Motor
Since the first appearance of this work, in 1911, such remarkable advances have been made in the design of automobile gasoline engines and in their production that it has been found necessary to largely re-write the text for the present edition. Various branches of the subject have been further elaborated and a new chapter on water-cooling systems has been added. It was the original intention not to incorporate in this volume a treatment of the so-called engine accessories, such as carburetors, ignition appliances, etc., partly because their inclusion would have unduly extended the scope and size of the volume and partly because these accessories almost invariably are designed by specialists and not by car designers, and can, therefore, be treated more handily in separate volumes. In the meantime the subject of electrical equipment has been dealt with in two or three books of a semi-technical character, and a number of technical works on carburetors have also appeared. On the other hand, the cooling system does not lend itself so well to treatment in a separate work, because the various parts of which it is composed are not all the product of one particular industry. The proportioning and general design of the various elements of the cooling system devolve upon the car designer, and a treatment of the subject is, therefore, properly included in this volume, which is addressed to automobile and gasoline motor engineers and those who aspire to membership in these professions.
One difficulty that was met with in preparing this revised edition was the increasing deviation in pleasure car and motor truck engine practice. Of course, the underlying principles of both types of engines are the same, but it has been attempted in this volume to go a little further than merely presenting basic principles, by giving rules and constants of design wherever possible, and to illustrate principles by representative examples. Now that pleasure car engines run at about 2,000 feet piston speed per minute and truck engines at little over one-half this speed, it is difficult to give single examples representative of all classes of automobile engines.
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