Differences
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techtalk:ref:oil06 [2019/05/25 02:21] 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. \\ | ||
| - | ===== Comparing 77-85, 98-06 and 07 and up Pumps ====== | + | |
| + | ====== 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. \\ | ||
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| + | * **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" | ||
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| + | |||
| + | ====== 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. \\ | ||
| There were 3 different fitting changes to the 77-81 pump but the body stayed the same. \\ | There were 3 different fitting changes to the 77-81 pump but the body stayed the same. \\ | ||
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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**: \\ | ||
