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| techtalk:ref:engmech07b [2020/10/02 07:40] – hippysmack | techtalk:ref:engmech07b [2020/10/02 14:16] (current) – hippysmack | ||
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| - | ====== REF: Engine Mechanicals - Sub-07A ====== | + | ====== REF: Engine Mechanicals - Sub-07B ====== |
| ====== Affects of the 45° Rod / Piston Arrangement ====== | ====== Affects of the 45° Rod / Piston Arrangement ====== | ||
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| Intake vacuum is relative to piston / rod positions. \\ | Intake vacuum is relative to piston / rod positions. \\ | ||
| - | On carbed models with VOES: \\ | + | An example with on carbed models with VOES / MAP: (although this is the same for all Sportsters) |
| - | Vacuum is created in the cylinders which pulls air (vacuum) from the carb. \\ | + | Vacuum is created in the cylinders which pulls vacuum from the carb. \\ |
| - | This vacuum is tapped into and used to operate ignition timing through the VOES. \\ | + | This vacuum is tapped into and used to operate ignition timing through the VOES / Map. \\ |
| So a vacuum gauge plugged into the vacuum line at the carb does reflect the position of the two pistons. \\ | So a vacuum gauge plugged into the vacuum line at the carb does reflect the position of the two pistons. \\ | ||
| I.E. the gauge moves when the pistons are on the way down and goes toward the resting position when the pistons are coming up. \\ | I.E. the gauge moves when the pistons are on the way down and goes toward the resting position when the pistons are coming up. \\ | ||
