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| Description: Vacuum is pressure below atmospheric pressure and is measured in inches (or millimeters) of mercury (Hg). An engine in good mechanical condition will run with high manifold vacuum. Vacuum tests include testing the engine for cranking vacuum, idle vacuum, and vacuum at 2500 RPM. - Cranking Vacuum Test - Idle Vacuum Test - Low and Steady Vacuum - Fluctuating Vacuum For example, an engine in good mechanical condition should produce 17 to 21 in.Hg of vacuum at idle at sea level. Picture Stats: Views: 223 Filesize: 49kB Height: 490 Width: 590 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35920 |