Two-Stroke Diesel Engine Cycle Diagram - Scavenging & Compression Schematic

This is a photographed page from a diesel technology textbook showing a cutaway schematic of a two-stroke diesel engine cycle. Two cross-section illustrations are shown side by side. The left illustration, labeled 'Scavenging,' shows a Roots-type lobed blower forcing air (marked with 'Air' labels and directional arrows) through intake ports in the cylinder wall while the piston is near the bottom of its stroke; arrows show fresh air sweeping upward through the cylinder and exhaust gases exiting past open valves at the top of the cylinder head, where an injector is centrally mounted. The right illustration, labeled 'Compression,' shows the piston rising with the exhaust valves closed and intake ports covered, compressing the air charge above the piston; the blower continues drawing in air. A partial third diagram is visible at the right edge of the frame, suggesting the full figure depicts additional cycle events (likely on the adjacent page). The figure caption at the bottom is cut off and mostly illegible but begins 'FIGURE ... two-... diesel cycle.' A reader learns how a blower-scavenged two-stroke diesel replaces exhaust gases with fresh air and how compression begins once the ports and valves close. The page contains no part numbers, fuse data, or vehicle-specific applicability.