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techtalk:ref:oil10 [2019/06/22 00:36]
hippysmack [Wet Sumping Due to High Revs]
techtalk:ref:oil10 [2019/06/22 05:34]
hippysmack [Wet Sumping]
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 ====== REF: Oiling & Lubrication ====== ====== REF: Oiling & Lubrication ======
 ====== Wet Sumping ====== ====== Wet Sumping ======
-See also [[techtalk:​ref:​oil05#​engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]] ​in the REF section of the Sportsterpedia. \\+See also in the REF section of the Sportsterpedia:​ \\ 
 +  * [[techtalk:​ref:​engmech04|Evo Crankcase Pressure]] 
 +  * [[techtalk:​ref:​oil05#​engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]]
  
 Wet sumping is a condition between the flywheels and the scavenge passage. \\ Wet sumping is a condition between the flywheels and the scavenge passage. \\
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   * The scavenger pump picks up the oil and sends it to the oil tank. The hotter the oil, and the more air bubbles in the oil, the harder it is for the scavenger pump to move the oil. So, the oil collects in the crankcase even more.   * The scavenger pump picks up the oil and sends it to the oil tank. The hotter the oil, and the more air bubbles in the oil, the harder it is for the scavenger pump to move the oil. So, the oil collects in the crankcase even more.
   * The symptoms are sudden dwindling of power and the oil fogging out of the (breather) vent. ((iNSaNeSHaNe of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073512&​page=10)) \\ Simply slowing the rpm can make it quit very quickly. \\ When shut off immediately during wet sumping, you may check the oil dipstick to find the oil level low or almost dry. \\ Fire it back up and it should fill the tank almost full again. ​   * The symptoms are sudden dwindling of power and the oil fogging out of the (breather) vent. ((iNSaNeSHaNe of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073512&​page=10)) \\ Simply slowing the rpm can make it quit very quickly. \\ When shut off immediately during wet sumping, you may check the oil dipstick to find the oil level low or almost dry. \\ Fire it back up and it should fill the tank almost full again. ​
 +  * When sumping, it may feek like the motor sort of seized up. ((BWP 5p of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=75740&​highlight=reed+valve&​page=4)) \\ When it happens you know it! \\ Very sluggish, won't pull and higher oil temp.
   * The '04 and up Sportsters have had the oil return system redesigned. There are several people having heat and oil consumption issues with 883-1200+ conversions and there are stock bikes having heat and oil consumption issues as well. The 883's and 1200's seem to wet sump worse than years before 2004. Even prior to 2004 Sportster engines were known to wet sump badly under high rpm conditions.   * The '04 and up Sportsters have had the oil return system redesigned. There are several people having heat and oil consumption issues with 883-1200+ conversions and there are stock bikes having heat and oil consumption issues as well. The 883's and 1200's seem to wet sump worse than years before 2004. Even prior to 2004 Sportster engines were known to wet sump badly under high rpm conditions.
   * The '04 and up bikes are having issues with the return from the heads to the crankcase. The pressure from the crankcase is forced UP thru the passages and the push rod covers to go out the head breathers. This impedes the oil trying to go down. The oil sits in the head longer collecting more heat and getting thinner. Eventually, the oil pools in the head deep enough to cover the valve seals which are not designed to be submerged in oil. The piston sucks the thinned and hot oil thru the valve seal and guide during the intake stroke causing the engine to burn excessive amounts of oil.   * The '04 and up bikes are having issues with the return from the heads to the crankcase. The pressure from the crankcase is forced UP thru the passages and the push rod covers to go out the head breathers. This impedes the oil trying to go down. The oil sits in the head longer collecting more heat and getting thinner. Eventually, the oil pools in the head deep enough to cover the valve seals which are not designed to be submerged in oil. The piston sucks the thinned and hot oil thru the valve seal and guide during the intake stroke causing the engine to burn excessive amounts of oil.