Differences
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techtalk:ref:oil06 [2019/05/25 14:27] hippysmack [Oil Pump Covers] |
techtalk:ref:oil06 [2022/06/24 00:39] hippysmack [Return to Feed Ratios] |
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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 ====== | ||
| + | 1977-1985 feed gerotors have the smallest volume and smallest of the gerotor pumps used on Sportsters. \\ | ||
| + | 1986-2006 feed gerotors have the same volume. \\ | ||
| + | 1977-1997 return gerotors have the same volume. \\ | ||
| + | 1998-2006 return gerotors have the same volume. \\ | ||
| + | 1977-2006 gerotors all have the same teeth profile (bodies changed OD but volume per height stayed the same). \\ | ||
| + | 2007-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. \\ | ||
| + | 1977-1990 return inlet hole ID = 0.250" \\ | ||
| + | 1991-1997 return inlet hole ID = 0.280" \\ | ||
| + | 1998-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 ======= | ====== 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. \\ | ||
