Differences

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--- techtalk:evo:oil03 [2024/05/03 18:23]
hippysmack [Oil Pump Fittings and Oil Paths]
+++ techtalk:evo:oil03 [2024/05/07 00:41]
hippysmack [Oil Pump Fittings and Oil Paths]
@@ Line 96: / Line 96: @@
 Normal riding conditions: 12-17 psi (2500 rpm) \\
+-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. \\
+-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. \\
 ===== Gauge mounted at oil filter pad =====
 As checked with hot oil and a gauge at the oil pressure switch location at oil filter pad. \\
@@ Line 116: / Line 128: @@
   * The oil pump and the head breathers are a new design. \\ The oil pump rotors are driven by the cams, the feed rotor is driven off the front intake cam and the scavenge rotor is driven by the rear exhaust cam.
-====== Oil Pump Fittings and Oil Paths ======
+====== Oil Pump Volume (1977-Up) ======
-Different year oil pumps came with several different fittings. Part numbers and usage is labeled in the pics below. \\
-**Note**: HD fittings are generally beefier than aftermarket fittings (especially from your local hardware store). \\
-Some of these fitting started out in the ironhead or pre-ironhead days in metal or brass construction. \\
-HD later replaced some metal fittings with brass using the same part number. \\
-You can find some in NOS condition in metal as well as brass or zinc. \\
-Colony sells some in cad plated versions and you can also find some in chrome online. \\
-Note: \\
-Fittings 26496-75 and 26496-75A are the same fitting accept the -75A version comes with lockpatch on the threads. \\
-Fittings 63533-41 and 63533-41A are the same fitting accept the -41A version comes with lockpatch on the threads. \\
-Fittings 62601-91 and 62601-91A are the same fitting accept the -91A version comes with lockpatch on the threads. \\
-|  1986-1990 Oil Pump Fittings ((photo by Hippysmack))  |  1991-Up Sportster Oil Pump Fittings ((photo by Hippysmack))  |
-|{{techtalk:evo:oil:1986-1990_sportster_oil_pump_fittings_by_hippysmack.jpg?direct&300|}}|{{techtalk:evo:oil:1991-up_sportster_oil_pump_fittings_by_hippysmack.jpg?direct&300|}}|
-\\
-  * **1986-1990 oil pumps** feed oil to the motor from the top side of the pump. \\ Feed oil goes from oil tank to the lower gerotors, out the lower feed fitting to the filter pad, back into the pump through the middle (upper feed) fitting. \\ Return oil drops into the "duck bill" on the back of the pump, to the upper gerotors to the top "dual" fitting, to the tank.
-  * **1991-1997 oil pumps** feed oil to the oil filter pad (actually 1991-present Sportster oil pumps do). \\ Oil is sent from the filter into the motor by another oil passage machined into the right engine case. \\ Feed oil goes from the oil tank to the lower gerotors, out the lower front fitting to the filter. \\ Return oil drops into the "duck bill" on the back of the pump, to the upper gerotors, to the upper front fitting, to the tank.
-  * **1998-Up oil pumps** also feed oil to the oil filter pad, with the (routing) difference being an added return inlet in the top of the pump. \\ Feed oil goes from the oil tank to the lower gerotors, out the lower front fitting to the filter. \\ Crankcase return oil drops into the "duck bill" on the back of the pump, to the upper gerotors, to the upper front fitting, to the tank. \\ Cam chest return oil drops into the extra inlet in the top front of the pump, to the upper gerotors, to the upper front fitting, to the tank.
-[[techtalk:evo:oil04|Click Here]] to reference the Oil Tank, Lines and Routing Page in the Sportsterpedia. \\
-|  86-90 Oil Pump Oiling Paths. ((photo by Hippysmack))  |  91-97 Oil Pump Oiling Paths  ((photo by Hippysmack))  |  98 and Up Oil Pump Oiling Paths ((photo by bsaman of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/87615-crank-replacement-documentation/page2?t=691283&page=2))  |
-|{{:techtalk:evo:oil:86-90_oil_pump_oiling_paths_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:91-97_oil_pump_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:98-up_oil_pump_oiling_paths_by_bsaman.jpg?direct&300|}}|
-====== Oil Pump Volume (1957-1985) ======
 It is not stated in the manuals how much oil these pumps will deliver. \\
 However, testing has been done to find out the flow rates (both feed and return sides) on 1977-up gerotor pumps. \\
@@ Line 149: / Line 134: @@
   *  [[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]].
+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. \\
+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. \\
 ====== Priming the Oil Pump ======
@@ Line 161: / Line 164: @@
     * 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.
-    * 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. \\
-\\
 ====== Oil Pump - Complete Unit Part Numbers ======

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