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techtalk:evo:oil03 [2024/05/03 18:26] hippysmack [Oil Pump Volume (1957-1985)] |
techtalk:evo:oil03 [2024/05/03 20:26] hippysmack [Oil Pump Volume (1977-Up)] |
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Normal riding conditions: 12-17 psi (2500 rpm) \\ | Normal riding conditions: 12-17 psi (2500 rpm) \\ | ||
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+ | 1986-1991 models have a high pressure regulator built into the feed path to dump excess pressure to the bottom of the cam chest. \\ | ||
+ | The relief valve pressure is 30-35 PSI so any oil in that pressure range does not go to lubricating or cooling the motor. \\ | ||
+ | It's just dumped to drain back into the return path to the tank. \\ | ||
+ | [[techtalk:evo:oil01#oil_pressure_regulator_-_1986-1991_models_only|Click Here]] to read more on the oil pressure regulator in the Sportsterpedia. \\ | ||
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+ | 1992-Up cases ditched the pressure relief valve and got a small hole drilled into the upper cam case thru the oil feed path. \\ | ||
+ | That hole serves as a pressure relief as well as an extra spray of oil to #2 cam gear teeth. \\ | ||
+ | So 1992-up models have a constant pressure release in a way. \\ | ||
+ | [[techtalk:evo:oil01#oil_pressure_regulator_-_92_and_up_models|Click Here]] to read more on in the Sportsterpedia. \\ | ||
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===== Gauge mounted at oil filter pad ===== | ===== Gauge mounted at oil filter pad ===== | ||
As checked with hot oil and a gauge at the oil pressure switch location at oil filter pad. \\ | As checked with hot oil and a gauge at the oil pressure switch location at oil filter pad. \\ | ||
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* [[techtalk:ref:oil22#measuring_output_volume_flow_rate_of_a_gerotor_oil_pump|Measuring Output Volume (flow rate) of a Gerotor Oil Pump]]: Measuring by flow rate by cc'ing gerotors as well as bench testing in real time. | * [[techtalk:ref:oil22#measuring_output_volume_flow_rate_of_a_gerotor_oil_pump|Measuring Output Volume (flow rate) of a Gerotor Oil Pump]]: Measuring by flow rate by cc'ing gerotors as well as bench testing in real time. | ||
* [[techtalk:ref:oil22p|Charted result summaries from cc'ing the gerotors]]. | * [[techtalk:ref:oil22p|Charted result summaries from cc'ing the gerotors]]. | ||
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+ | Oil pressure has a direct relationship with oil flow rate. \\ | ||
+ | Oil pressure also changes throughout the feed path. The most pressure will always be at the oil pump. \\ | ||
+ | Oil pressure is reduced as oil travels though the restrictions in the engine. \\ | ||
+ | The manuals state the oil pump will deliver it's entire content under pressure. \\ | ||
+ | And that is true, with exception. The oil pressure under normal riding conditions is generally low. \\ | ||
+ | As RPM goes up, the oil flow goes up and the pressure in the feed path goes up. \\ | ||
+ | As RPM goes down, the oil flow goes down and the pressure in the feed path goes down. \\ | ||
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+ | The caveat is the outlet sizes (restrictions) in the oil feed path. \\ | ||
+ | The outlets are very small orifices (crankpin and rockers). \\ | ||
+ | Add the #2 cam squirter on 1992-up engines and the 2 piston squirters on 2004-up engines. \\ | ||
+ | As RPM goes up, flow increases and the outlets get flooded with more oil pushing thru them. \\ | ||
+ | If oil can't get thru outlets as fast as pump is pushing the oil, pressure rises on the incoming side of outlets. \\ | ||
+ | Faster flow thru the outlets = less pressure in the feed path, slower flow thru the feed paths = more pressure in the feed path. \\ | ||
+ | This is why pressure is always highest on cold startup and pressure falls as the oil heats up. \\ | ||
+ | Colder oil is thicker and more resistant to flow. Hotter oil is thinner less resistant to flow. \\ | ||
====== Oil Pump Fittings and Oil Paths ====== | ====== Oil Pump Fittings and Oil Paths ====== | ||
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* If you let it sit long enough, oil will gravity drain inside the pump and prime it. | * If you let it sit long enough, oil will gravity drain inside the pump and prime it. | ||
* Another way to prime the pump is to use assembly lube on the gerotors and inside of the pump before installing it. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/163867-cam-cover-removal#post3491821)) \\ Then you have an instant hydraulic seal to help the oil pump suck oil from the hose. | * Another way to prime the pump is to use assembly lube on the gerotors and inside of the pump before installing it. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/163867-cam-cover-removal#post3491821)) \\ Then you have an instant hydraulic seal to help the oil pump suck oil from the hose. | ||
- | * You can also using a large syringe with a tapered tip inserted into the oil supply hose on the bottom of the oil tank. ((ericfreeman of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196980-vapor-lock-on-77-and-later-oil-pumps#post4303198)) \\ Then you can force feed oil to the pump and on to the engine using this technique. | + | * You can also using a large syringe with a tapered tip inserted into the oil supply hose on the bottom of the oil tank. ((ericfreeman of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/196980-vapor-lock-on-77-and-later-oil-pumps#post4303198)) \\ Then you can force feed oil to the pump and on to the engine using this technique. \\ |
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====== Oil Pump - Complete Unit Part Numbers ====== | ====== Oil Pump - Complete Unit Part Numbers ====== | ||