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techtalk:ref:oil06 [2019/05/25 14:27]
hippysmack [Oil Pump Covers] 		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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