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--- techtalk:evo:oil03 [2024/01/05 03:23]
hippysmack
+++ techtalk:evo:oil03 [2024/05/03 20:26]
hippysmack [Oil Pump Volume (1977-Up)]
@@ 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) ======
+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. \\
+See the links below for those articles in the Sportsterpedia. \\
+  *  [[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. \\
+====== Oil Pump Fittings and Oil Paths ======
 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). \\
@@ Line 154: / Line 190: @@
     * 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 ======