The effectiveness of a double-stem injection valve in controlling combustion in a compression-ignition engine
This is a 1931 NASA technical report, published as a NASA Technical Reports Server item, testing whether a double-stem fuel injection valve can control combustion in a compression-ignition engine. Its pictures are pressure-against-crank-angle indicator diagrams, with curves plotted in pounds per square inch over degrees of crank travel and annotated with cut-off and injection-start timings, giving designers a stark, graph-paper vocabulary of falling curves, dashed guide lines and labelled axes.
