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techtalk:ref:oil05f [2019/05/23 05:51] hippysmack [Sportster oil pumps] |
techtalk:ref:oil05f [2019/05/25 04:00] hippysmack [Conclusions from testing] |
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| The results reportedly revealed that this modification increases the return flow from the sump by 63%. \\ | The results reportedly revealed that this modification increases the return flow from the sump by 63%. \\ | ||
| - | This shows how much return capacity that is left on the table; \\ | + | This shows how much return capacity that is left on the table using the 07 pump (if there's no oil in the cam chest to fall into the top port). \\ |
| - | When a newer style OEM pump with a cam chest suction port is installed in XL-cases that has the cam chest drain port to the sump. \\ | + | |
| - | + | ||
| - | If these 1998-and-up OEM pumps are installed in an XL-pattern engine that is designed to direct the oil to the sump; \\ | + | |
| - | Then the scavenge capacity of the oil pump will be severely reduced. \\ | + | |
| However, the testing was done in a controlled environment. \\ | However, the testing was done in a controlled environment. \\ | ||
| It is also assuming that the cam chest port in the pump is either full of oil or full of air during normal installed operation. \\ | It is also assuming that the cam chest port in the pump is either full of oil or full of air during normal installed operation. \\ | ||
| This will never be true in the real world. \\ | This will never be true in the real world. \\ | ||
| - | Crankcase pressure will end up dropping splash oil and oil mist into the cam chest port of the oil pump. \\ | + | In an 86-90 engine; \\ |
| + | Crankcase pressure, cam and pinion gears will end up dropping oil mist and splash oil into the cam chest port of the 98-up oil pumps. \\ | ||
| It may not be a steady supply of oil but the cam chest port would never be dry. \\ | It may not be a steady supply of oil but the cam chest port would never be dry. \\ | ||
| The pressure regulator in the 86-91 engine will dump excess oil into the gearcase as it was designed to do. \\ | The pressure regulator in the 86-91 engine will dump excess oil into the gearcase as it was designed to do. \\ | ||
| + | Some of this will also splash get splash into the cam chest drain port. \\ | ||
| The regulator is notorious for leaking oil into the gearcase as well when not activated. \\ | The regulator is notorious for leaking oil into the gearcase as well when not activated. \\ | ||
| - | So the results, even though interesting, will vary constantly inside a running engine. \\ | + | So the results, even though interesting, will vary constantly inside a running 86-90 engine. \\ |
| + | However, the Karling mod will eliminate the chance of cavitation in the oil pump (that's due from induced air into the cam chest port of the newer style oil pumps) \\ | ||
