Differences

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--- techtalk:ref:oil06 [2019/05/16 23:01]
hippysmack [Mixing Parts]
+++ techtalk:ref:oil06 [2024/01/19 01:18] (current)
hippysmack
@@ Line 6: / Line 6: @@
 [[techtalk:ih:oil03#oil_pump|77-85 Oil Pump]] in the IH section of the Sportsterpedia. \\
 [[techtalk:evo:oil03|86-Present Oil Pump]] in the Evo section of the Sportsterpedia. \\
-===== Comparing 77-85, 98-06 and 07 and up Pumps =====
+====== Return to Feed Ratios ======
+-1985 feed gerotors have the smallest volume and smallest of the gerotor pumps used on Sportsters. \\
+-2006 feed gerotors have the same volume. \\
+-1997 return gerotors have the same volume. \\
+-2006 return gerotors have the same volume. \\
+-2006 gerotors all have the same teeth profile (bodies changed OD but volume per height stayed the same). \\
+-present are the tallest and also have a different teeth profile. \\
+  * **77-85 return to feed ratio app 2.78:1**
+    * Return Height: .500", Feed Height: .180"
+  * **86-90 return to feed ratio app 1.89:1**
+    * Return Height: .500", Feed Height: .265"
+  * **91-97 return to feed ratio app 1.89:1**
+    * Return Height: .500", Feed Height: .265"
+  * **98-06 return to feed ratio app 2.64:1**
+    * Return Height: .700", Feed Height: .265"
+  * **07-up return to feed ratio app 4.25:1**
+    * Return Height: .850", Feed Height: .200"
+====== Return hole in the "duck bill" ======
+The size of the crankcase oil inlet hole inside the duck bill changed a couple times. \\
+-1990 return inlet hole ID = 0.250" \\
+-1997 return inlet hole ID = 0.280" \\
+-Present return inlet hole ID = 0.350" \\
+{{:techtalk:ref:oil:1977-present_sportster_oil_pump_return_inlet_id_by_hippysmack.jpg?direct&400|}} \\
+====== Comparing 77-85, 98-06 and 07 and up Pumps =======
 With a 98 style gasket on the 79 pump, the gasket fits nice and snug as it should be. \\
 There were 3 different fitting changes to the 77-81 pump but the body stayed the same. \\
@@ Line 12: / Line 40: @@
 |{{:techtalk:ref:oil:77_and_98_oil_pump_comparison.jpg?direct&300|}}|{{:techtalk:ref:oil:77_and_98_oil_pump_comparison_1_by_hippysmack.jpg?direct&300|}}|
-The 79, 98 and 07 pumps were bolted to and outlined on the aluminum sheet. ((photos by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=6)) \\
+The 79, 98 and 07 pumps were bolted to and outlined on the aluminum sheet. ((photos by Hippysmack of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page6?t=2071153&page=6)) \\
 |{{:techtalk:ref:oil:77_and_98_oil_pump_comparison_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:77_and_98_oil_pump_comparison_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:77-98-07_oil_pump_comparison_1._by_hippysmack.jpg?direct&300|}}|
@@ Line 35: / Line 63: @@
 |{{:techtalk:ref:oil:sportster_gerotor_oil_pump_comparison_8_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:sportster_gerotor_oil_pump_comparison_9_by_hippysmack.jpg?direct&300|}}|
-===== 77-85 and 86-90 Oil Pump Comparison =====
+====== 77-85 and 86-90 Oil Pump Comparison ======
 The 79-85 pump was bolted to and outlined on the aluminum sheet. \\
 The 86-80 pump was then bolted to the sheet clearly within the mark of the 79-85 pump. \\
@@ Line 46: / Line 74: @@
 |{{:techtalk:ref:oil:77_and_86_oil_pump_comparison_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:77_and_86_oil_pump_comparison_7_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:77_and_86_oil_pump_comparison_8_by_hippysmack.jpg?direct&300|}}|
-==== Feed Gerotors ====
+===== Feed Gerotors =====
 **77-85**: \\
 -85 feed gerotors are the same size with the exception of the L83 removal of the chamfer on the outside of the set. \\
@@ Line 76: / Line 104: @@
 |{{:techtalk:ref:oil:feed_gerotor_evolution_77-85.jpg?direct&300|}}|{{:techtalk:ref:oil:feed_gerotor_evolution_86-06.jpg?direct&300|}}|{{:techtalk:ref:oil:feed_gerotor_evolution_07-up.jpg?direct&300|}}|
-==== Return (scavenge) Gerotors ====
+===== Return (scavenge) Gerotors =====
 **77-90**: \\
 -85 return gerotors are the same size with the exception of the L83 removal of the chamfer on the outside of the set. \\
@@ Line 92: / Line 120: @@
 ===== Oil Pump Covers =====
+**86-90 cover on 77-85 pump body**: \\
 Installing an 86 cover on the 77-85 oil pump creates problems. \\
-The feed lines are configured differently on 86-90 than 77-85 oil pumps.
+-90 oil pump covers look identical from the outside. \\
+The only visual difference on the outside is that the 77-85 pump has an oil pressure switch on the front and the 86-90 pump has a hose fitting there. \\
+Take the fittings off the ends and it looks as if they would be interchangeable. \\
+The factory oil fittings are different which can give clues to the year model used on. \\
+But these fittings do get changed from time to time from different owners.
+Looking on the inside, there is a feed hole in the arm of the 77-85 pumps that doesn't exist in the later pump covers. \\
+This is the oil feed hole to the engine on 77-85 engines. \\
+-90 oil pumps route the feed out to an external oil filter and back into a separate cavity in the pump body to feed the engine. \\
+(so the feed hole in the arm is not needed in the cover on 86-90 pumps) \\
+-90 engines are fed oil from a passage in the pump body instead of the cover. \\
+| L83 pump body and 86-90 cover. ((photo by jlv of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/196850-oil-pump-iron-1000-1979-bizarre#post4301658))  |  77-85 covers w/ feed hole in arm. ((photo by Hippysmack))  |  86-90 covers without the feed hole in the arm. ((photo by Hippysmack))  |
+|{{:techtalk:ref:oil:77-85_oil_pump_with_86-90_cover_by_jlv.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_cover_3_by_hippysmack.jpg?direct&300|}}|
-**Feed gerotor surface depth chabge**: \\
+**Feed gerotor surface depth change**: \\
+Modding the 86-90 cover by drilling the hole out in the arm won't be an adequate fix to adapt it for use on a 77-85 pump body. \\
 The scavenge gerotors are the same size in 77-90 pumps. \\
 However, the feed gerotors got bigger in 86. \\

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