Effect of Combustion-chamber Shape on the Performance of a Prechamber Compression-ignition Engine
This is a 1934 NACA technical note on compression-ignition engines, published by the National Advisory Committee for Aeronautics for engineers and researchers. The first plate photographs a single-cylinder research engine on a test stand with its instrumentation, and the second and third plates are cross-section line drawings of cylinder-head designs with spherical and disk-shaped prechambers. A designer could take from them the clean, technical diagram style of mechanical cutaway drawings, with dashed flow passages and labelled callouts.
