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Excerpt from Diesel: The Modern Power Compression ratio is an engineer ing term which is really quite simple. If we say an engine has a compression ratio of 6 to 1, it means that the volume above the piston is six times as much when the piston is at the bottom of its stroke as it is when the piston is at the top. If the cylinder in the first two illustrations would hold six pints with the piston at the bottom of the cylinder, and one pint with the piston at the top of the cylinder, it would have a 6 to 1 compression ratio. Likewise, if the capacity was sixteen pints at the bottom and one pint at the top, as in the second two illustrations, the compression ratio would be 16 to 1. These two compression ratios, 6 to 1 and 16 to 1, are typical of those for a gasoline engine and Diesel engine respectively. This means that if the cylinder is full of air or a mixture of gas oline and air when the piston is at the bottom of the stroke, it is squeezed to one-sixth of its volume in the gasoline engine and to one sixteenth of its volume in the Diesel engine when the piston reaches the top of the stroke. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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