Rotary (Wankel) Engine Cycle Schematic - 6-Stage Rotor Position Diagram

This document is a schematic showing the operating cycle of a rotary (Wankel-type) engine. Six cross-sectional diagrams, arranged in two rows of three, depict a triangular rotor inside an epitrochoidal housing at successive positions of rotation. Each diagram shows two spark plugs mounted on the right side of the housing, port passages on the left, and a hatched/shaded region marking one working chamber as it progresses through the intake, compression, combustion, and exhaust phases. Circled numeric callouts 1 through 18 are distributed across the six frames (three per frame), evidently labeling rotor faces or chamber phases at each cycle position, but the scan contains no legend or key defining what the numbers mean. There is no other text: no captions, part numbers, torque values, model or year identification anywhere in the image. A reader can learn the general geometry and phase sequence of a rotary engine's combustion cycle from the drawings, but cannot identify a specific vehicle, engine model, or year from this document alone. The scan is a white-line-on-black reproduction with adequate diagram clarity but no textual content beyond the numbered callouts.