Labels:text | diagram | line OCR: In fact, of course, the three engine types usually look somewhat different in the real world, and they almost always have two or more cylinders. Animation details: The pressure-volume, or P-U diagram is shown to the right of each engine example, and the "blip" on the diagram is synchronized with the engine rotation. P POSITIVE WORK R MN - 3 NEGATIVE WORK 2 "BLIP" R E 0 +VOLUME STROKE CLEARANCE VOLUME