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-techtalk:ref:oil05f [2022/05/15 21:31]
– [Testing] hippysmack
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+techtalk:ref:oil05f [2023/12/23 01:28] (current)
– hippysmack
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 ----
 
 Karling Racing in Sweden designed this mod after flow testing a 2007-up Sportster oil pump for use in an 86-90 engine. ((Jorgen of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/149281-124-1993-xlh-build-thread/page42?t=1619616&page=42)) ((https://www.karlingracing.com/sv)) \\ 
 |  Karling Racing's oil pump mod for 07-up oil pumps. ((photo by Jorgen of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/149281-124-1993-xlh-build-thread/page42?t=1619616&page=42))  |  Another Karling modded oil pump  ((photo by Rubine of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-styles/sportster-motorcycle-project/173419-88ci-sport-rod/page10?t=1861960&page=10))  |
 |{{:techtalk:ref:oil:karling_racing_07_oil_pump_mod_by_jorgen.jpg?direct&300|}}| {{techtalk:ref:oil:karling_modded_07_oil_pump_by_rubine.jpg?direct&300|}}|
 
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 ====== Applications for this mod ======
 
 __This oil pump modification is only suitable in engines where you want to maximize crankcase sump scavenging__. \\
 It was originally designed with a 124" S&S motor in mind. [[httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/149281-124-1993-xlh-build-thread?t=1619616|The Xlforum build thread is here]]. \\
 A Karling modified 2007-and-up oil pump may be an improvement in Sportster Evo engines with pre-98 H-D OEM cases. \\
 These engines were not made to scavenge from the cam chest either. They have the oil drain from the cam chest to the sump. \\
@@ Line -33,5 +32,4 @@ removed created
 
 ====== Background ======
 
 Previously, most engine builders fitted 4-cam race engines with ProFlow 3-stage or 4-stage oil pumps. \\
 Since those pumps are now discontinued, engine builders (Karling and others) often use these OEM pumps for; \\
@@ Line -56,5 +54,4 @@ removed created
 
 ==== Cam chest drainage ====
 
 Notice the differences in the 86-90 and 91-up cam chest floor. \\
 The elevation is stepped down from left to right on both cases. \\
@@ Line -78,13 +75,12 @@ removed created
 Click here to see [[techtalk:evo:oil01#oil_passages_from_the_filter_pad|Evo cam chests from different year models]] in the Sportsterpedia.
 
 |  S&S cam chest drain  ((photo by Jorgen of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/149281-124-1993-xlh-build-thread/page45?t=1619616&page=45 ))  |  86-97 cam chest drains to crankcase sump \\ (86-90 engine shown). ((photo by Mini_blitz of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/183493-1986-evolution-sportster-cam-cover-install-help/page3?t=1974615&page=3))  |  98-up cam chest drains into the oil pump. \\ (98 engine shown) ((photo by Hippysmack))  |
 |{{:techtalk:ref:oil:sands_cam_chest_by_jorgen.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_engine_scavenging_by_mini_blitz.jpg?direct&300|}}|{{:techtalk:evo:oil:91-99_cam_cover_gasket_1_by_hippysmack.jpg?direct&300|}}|
 
 ==== Sportster oil pumps ====
 
 The design of the oil pumps changed with the different oiling system changes to the engines. \\
 You can see the runners on the top of the 98-up pumps leading to the cam chest drain port. \\
 
 |  86-90 Oil Pump Oiling Paths. ((photo by Hippysmack))  |  91-97 Oil Pump Oiling Paths  ((photo by Hippysmack))  |  98 and Up Oil Pump Oiling Paths ((photo by bsaman of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/87615-crank-replacement-documentation/page2?t=691283&page=2))  |
 |{{:techtalk:evo:oil:86-90_oil_pump_oiling_paths_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:91-97_oil_pump_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:98-up_oil_pump_oiling_paths_by_bsaman.jpg?direct&300|}}|
 
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 ====== Considerations ======
 
 This mod may improve scavenging of the crankcase sump but it is not the end of wet sumping in the engine. \\
 
 861986-91 1991 engines have an [[techtalk:evo:oil01#oil_pressure_regulator_-_1986-1991_models_only|oil pressure regulator]] that dumps excess oil pressure from the filter pad directly into the gearcase. \\
 When the regulator malfunctions, additional oil is dumped into the gearcase more often and at varying riding conditions. \\
 Read more about [[techtalk:ref:oil05e#oil_pressure_regulator|Oil Pressure Regulator Mods]] in the REF section of the Sportsterpedia. \\
 
 ====== Purpose of this mod ======
 
 Several mods have been devised in an attempt to scavenge more oil from 86-90 engines. \\
 One of which is the [[techtalk:evo:oil03c|5 Speed Oil Pump on 4 Speed Models (Conversion for 86-90 Evo engines)]] \\
 (adapting the engine case to accept a newer style oil pump to an 861986-90 1990 engine for better oil control) \\
 
 This mod addresses the issue of the cam chest drain port in the newer style pumps that is not required in 861986-96 1996 engines. \\
 
 When using 981998-up oil pumps for earlier engines: \\ 
 The concern is since the early engine drains the gearcase into the sump and the 07 2007 pump has an open port in the cam chest; \\ 
 You may be adding more air/aeration into the return system through the gearcase port in the pump. \\ 
 (which may lead to an increased risk of cavitation) ((Four Speed of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/183021-1986-90-evo-sportsters-what-every-owner-should-know-but-were-afraid-to-ask/page25?t=1971026&page=25)) \\
 
 **98-up oil pump gearcase drain ports**: \\
@@ Line -149,9 +143,7 @@ removed created
 |The cam chest drain port is the middle thru hole in \\ this pic (07 pump shown). ((photo by Hippysmack))|As the gerotors reside over the cavities, both pieces \\ rotate together. The relative openings between \\ gears stays the same ((photo by Hippysmack))|
 |{{:techtalk:evo:oil:2007_and_up_oil_pump_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:2007_and_up_oil_pump_5a_by_hippysmack.jpg?direct&300|}}|
 
 
 ====== Results ======
  
 When the gearcase port was allowed to suck air with the sump port immersed in liquid, the pump needed 22 seconds to fill the reference volume. ((Jorgen of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/149281-124-1993-xlh-build-thread/page43?t=1619616&page=43)) \\
 With the cam chest port blocked off and the internal gerotor kidney machined to optimize sump port scavenge capacity; \\
 The pump only needed 13.5 seconds to fill the reference volume. \\
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 ====== Conclusions from testing ======
 
 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 using the 07 2007 pump (if there's no oil in the cam chest to fall into the top port). \\
 
 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. \\
 This will never be true in the real world. \\
 In an 86a 1986-90 1990 engine; \\ 
 Crankcase pressure, cam and pinion gears will end up dropping oil mist and splash oil into the cam chest port of the 981998-up oil pumps. \\ 
 It may not be a steady supply of oil but the cam chest port would never be completely dry. \\ 
 The pressure regulator in the 861986-91 engine 1991 engines 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 by designed means). \\
 
 So the results, even though interesting, will vary constantly inside a running 861986-90 1990 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) \\
 

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