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techtalk:ref:oil06 [2019/05/25 02:22]
hippysmack
techtalk:ref:oil06 [2021/06/30 07:16]
hippysmack [77-Present Sportster Oil Pump Comparisons]
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 [[techtalk:​ih:​oil03#​oil_pump|77-85 Oil Pump]] in the IH section of the Sportsterpedia. \\ [[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. \\ [[techtalk:​evo:​oil03|86-Present Oil Pump]] in the Evo section of the Sportsterpedia. \\
 +
 +====== Return to Feed Ratios ======
 +77-85 feed gerotors have the smallest volume and smallest of the gerotor pumps used on Sportsters. \\
 +86-06 feed gerotors have the same volume. \\
 +77-97 return gerotors have the same volume. \\
 +98-06 return gerotors have the same volume. \\
 +77-06 gerotors all have the same teeth profile (bodies changed OD but volume per height stayed the same). \\
 +06-present are the tallest and also have a different teeth profile. \\
 +
 +  * **77-85 return to feed ratio app 2.78:1**
 +    * Feed Height: .180", Return Height: .500"
 +  * **86-90 return to feed ratio app 1.89:1**
 +    * Feed Height: .265", Return Height: .500"
 +  * **91-97 return to feed ratio app 1.89:1**
 +    * Feed Height: .265", Return Height: .500"
 +  * **98-06 return to feed ratio app 2.64:1**
 +    * Feed Height: .265", Return Height: .700"
 +  * **07-up return to feed ratio app 4.25:1**
 +  * Feed Height: .200". Return Height: .850"
 +
 +
 ====== Comparing 77-85, 98-06 and 07 and up Pumps ======= ====== 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. \\ With a 98 style gasket on the 79 pump, the gasket fits nice and snug as it should be. \\
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-|  77-85 covers w/ feed hole in arm. ((photo by Hippysmack)) ​ |  86-90 covers without the feed hole in the arm. ((photo by Hippysmack)) ​ | +| L83 pump body and 86-90 cover. ((photo by jlv of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=5749850#​post5749850))  ​|  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:​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|}}|+|{{:​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 change**: \\ **Feed gerotor surface depth change**: \\