ent internal combustion en-gines are divided into three classes, low compression,medium compression and high compression. The firstclass includes all automobile engines, the second class thehot bulb, surface combustion or semi-Diesel engines, andthe third group the Diesel engines. The advantages… … Fig. 1—Two types of leather valve packing, thepacking at the left is of the flange type while that atthe right is what is termed a U-packing. ical Laboratory of the Carnegie Institute of Technology.A small surface-ignition engine was used, after increas-ing the compression-pressure to 500 lb. per…
Automobiles · Aeronautics
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