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techtalk:evo:oil01 [2019/06/22 16:47] hippysmack [Oil Pump Feed] |
techtalk:evo:oil01 [2019/11/14 05:16] hippysmack [Oil Check Valve (77-E87)] |
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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. \\ | ||
| + | |||
| 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)) | | ||
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| See the full article, [[techtalk:ref:oil04#oil_tank_pressure|Oil Tank Pressure]], in the REF section of the Sportsterpedia. \\ | See the full article, [[techtalk:ref:oil04#oil_tank_pressure|Oil Tank Pressure]], in the REF section of the Sportsterpedia. \\ | ||
| There should not be any noticeable pressure in the oil tank although it does transfer pressure. \\ | There should not be any noticeable pressure in the oil tank although it does transfer pressure. \\ | ||
| + | The oil tank vent line to the cam chest allows the pump to send the oil to the tank without pressurizing the inside of it and blowing the cap off. ((cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=59421&highlight=piston+oiler&page=68)) \\ | ||
| + | It is not there to vent the cam chest, the breathers do that. \\ | ||
| **During normal operation**; \\ | **During normal operation**; \\ | ||
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| Oil pump pressure is always present in the cam cover with the engine running. \\ | Oil pump pressure is always present in the cam cover with the engine running. \\ | ||
| That is also a deceiving statement. Pump pressure runs through internal cavities in the cover to get from the top to the bottom of the cover and to the pinion shaft. \\ | That is also a deceiving statement. Pump pressure runs through internal cavities in the cover to get from the top to the bottom of the cover and to the pinion shaft. \\ | ||
| - | However, oil pump pressure does not dump directly into the cam chest from the cover. \\ | + | However, oil pump pressure does not dump directly into the cam chest from the cover normally. \\ |
| + | On 86-91 engines with the oil pressure regulator, the regulator dumps excess oil pressure into the gearcase until the high pressure condition subsides. \\ | ||
| + | 92 and Up engines do not have this spring actuating pressure regulator but they still have a pressure bleed off passage in the main feed galley. \\ | ||
| + | This tiny hole from the feed galley bleeds off excess feed pressure into the gearcase and onto the #2 cam gear. \\ | ||
| === 86-90 engines === | === 86-90 engines === | ||
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| So, the cup will turn sideways a bit only allowing oil to pass it on one side. \\ | So, the cup will turn sideways a bit only allowing oil to pass it on one side. \\ | ||
| - | {{:techtalk:ih:oil:77-85_oil_check_valve_drawing_by_hippysmack.jpg?direct&500|}} | + | {{:techtalk:ih:oil:a77-85_oil_check_valve_drawing_by_hippysmack.jpg?direct&500|}} |
| This reduction in pressure is also sensed by the oil pressure switch. \\ | This reduction in pressure is also sensed by the oil pressure switch. \\ | ||
