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techtalk:evo:oil01 [2019/06/22 16:47] hippysmack [Oil Pump Feed] |
techtalk:evo:oil01 [2019/06/22 17:02] hippysmack [Oil Pump Feed] |
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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)) | | ||
| Line 370: | Line 370: | ||
| 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 === | ||
