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techtalk:evo:oil01 [2019/06/22 16:59] hippysmack [Cam Cover Pressure] |
techtalk:evo:oil01 [2019/06/22 22:51] hippysmack [Crankcase Pressure] |
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| ===== Crankcase Pressure ===== | ===== Crankcase Pressure ===== | ||
| + | See also [[techtalk:ref:engmech04|Evo Crankcase Pressure and Engine Breathing]] in the REF section of the Sportsterpedia. \\ | ||
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| Crankcase air pressure is mainly generated by the up and down movement of the pistons. \\ | Crankcase air pressure is mainly generated by the up and down movement of the pistons. \\ | ||
| The downstroke of the piston causes the volume underneath the pistons to decrease which puts pressure on the oil in the sump. ((cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=73243&page=3)) \\ | The downstroke of the piston causes the volume underneath the pistons to decrease which puts pressure on the oil in the sump. ((cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=73243&page=3)) \\ | ||
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| * A drilled passage also connects the feed galley down to squirt excess feed pressure to #2 cam gear. | * A drilled passage also connects the feed galley down to squirt excess feed pressure to #2 cam gear. | ||
| * 04-Up engines: | * 04-Up engines: | ||
| - | * Additional, oil is fed from the feed galley (through a drilled passage) to the piston squirters. | + | * In addition, oil is fed from the feed galley (through a drilled passage) to the piston squirters. |
| | 91-97 Oil Pump Oiling Paths ((photo by Hippysmack)) | 98 and Up Oil Pump Oiling Paths ((photo by bsaman of the XLFORUM http://xlforum.net/forums/showthread.php?t=691283&page=2)) | | | 91-97 Oil Pump Oiling Paths ((photo by Hippysmack)) | 98 and Up Oil Pump Oiling Paths ((photo by bsaman of the XLFORUM http://xlforum.net/forums/showthread.php?t=691283&page=2)) | | ||
