Differences

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--- techtalk:ref:engmech05e [2019/06/03 02:20]
hippysmack [Adding a Vent Between the Oil Tank and the Cam Chest]
+++ techtalk:ref:engmech05e [2019/07/17 05:29]
hippysmack [REF: Oiling & Lubrication - Sub-05H]
@@ Line 1: / Line 1: @@
 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
-====== REF: Oiling & Lubrication - Sub-05H ======
+====== REF: Engine Mechanicals - Sub-05E ======
 ====== Adding a Vent Between the Oil Tank and the Cam Chest ======
+Also see [[techtalk:evo:engmech07|Crankcase Ventilation]] in the Evo section of the Sportsterpedia for pics and info on the OEM breathing system. \\
 **Background**: \\
-This mod was attempted to improve crankcase pressure venting for more efficient flow of oil and neutral pressure inside the oil tank on 04 and up Sportsters. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658)) \\
+This mod was attempted to improve crankcase pressure venting for more efficient oil flow, lower oil temps and neutral pressure inside the oil tank on 04 and up Sportsters. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658)) \\
+(even though the vents are different on earlier Sportsters, engine breathing is the same concept) \\
 Before this mod, the tank oil gauge would readily hit 250°F, the oil would look foamy after running hard and the top end was much noisy. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=11)) \\
 The idea was to install a PCV valve inline on the vent line from the oil tank to the cam chest in addition to the head vents. \\
 **Results of this mod**: \\
-This mod was deemed not to work properly as oil would back up into the added vent and cause higher oil temps at high RPM. \\
+This mod was deemed not to work properly at high RPM as oil would back up into the added vent and cause higher oil temps. \\
 It was eventually reversed with a solid hose replaced as in the OEM configuration. \\
 Then the cam cover was fitted with a vent and PCV valve **which did work**. \\
-Click here to view that article in the Sportsterpedia ... [[techtalk:ref:oil05d|Installing the Ultimate Crankcase Vent]] \\
+However, others have done this mod with positive results. Other engine mods, specific setups and riding style will vary results. \\
+Click here to view that article in the Sportsterpedia ... [[techtalk:ref:engmech05d|Installing the Ultimate Crankcase Vent]] \\
 ====== Installing the PCV in the Vent Line ======
-**Note**: \\
+**Note, use at your own risk!**: \\
-**Again, this mod was proven to Not work**. \\
+Again, this mod was proven to Not work on the subject engine. \\
-The process is detailed below for historical and educational purposes only! \\
+The process is detailed below for historical and educational purposes only until proven or revised! \\
   * Parts:
@@ Line 31: / Line 35: @@
 |Install the tee in the hose with the tee pointing up. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658))|The plastic tube needs to be clipped. \\ The excess piece is sitting on the belt. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658))|Connect the tee with a short piece of 5/16" hose. \\ Connect the tee to the plastic tube. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658))|
-|{{:techtalk:ref:oil:04_up_crankcase_vent_1_by_deimus.jpg?direct&300|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_2_by_deimus.jpg?direct&300|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_3_by_deimus.jpg?direct&300|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_1_by_deimus.jpg?direct&300|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_2_by_deimus.jpg?direct&300|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_3_by_deimus.jpg?direct&300|}}|
 Next, loop the new vent line up the frame tube and then run it back down. \\
-  * The length of hose going up will give an opportunity for any oil mist in the air being vented to collect on the insides of the hose and drain back down staying inside the engine.
+  * The length of hose going up will give an opportunity for any oil mist in the air being vented to collect on the insides of the hose. \\ (and drain back down staying inside the engine)
   * The vent inside the oil tank is on the left side of the tank.
   * When the bike is on the jiffy stand with the engine idling, if the oil level is high then oil might find its way down the vent line. \\ By having the loop in place, the tee is not the high point so the oil should drain down into the cam chest and be recycled back into the oil tank. \\ However, if the oil level is too high then the excess oil will be pumped out of the vent.
@@ Line 41: / Line 45: @@
 |  New vent installed and secured. ((photos by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658))  |||
-|{{:techtalk:ref:oil:04_up_crankcase_vent_4_by_deimus.jpg?direct&300|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_5_by_deimus.jpg?direct&200|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_6_by_deimus.jpg?direct&250|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_4_by_deimus.jpg?direct&300|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_5_by_deimus.jpg?direct&200|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_6_by_deimus.jpg?direct&250|}}|
 The new vent line is hardly noticeable and stays tucked close to the frame tube. \\
@@ Line 47: / Line 51: @@
 |  Original finished product. ((photos by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658))  ||
-|{{:techtalk:ref:oil:04_up_crankcase_vent_7_by_deimus.jpg?direct&400|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_8_by_deimus.jpg?direct&400|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_7_by_deimus.jpg?direct&400|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_8_by_deimus.jpg?direct&400|}}|
-**Ride report**: ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=10)) \\
+**First Ride report**: ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=10)) \\
 The trip was over 2,200 miles consisting of cool areas, warm areas, and very hot areas as well. \\
 So all conditions were encountered. The bike ran well the entire time. It never got hot nor foamed the oil. \\
@@ Line 100: / Line 104: @@
 And with the fuel filter being placed before the PCV valve, the oil should remain in the engine. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=11)) \\
-|{{:techtalk:ref:oil:04_up_crankcase_vent_9_by_deimus.jpg?direct&200|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_10_by_deimus.jpg?direct&200|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_9_by_deimus.jpg?direct&200|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_10_by_deimus.jpg?direct&200|}}|
 **Result**: ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=12)) \\
@@ Line 112: / Line 116: @@
 **Result**: \\
 The first 350 miles of the ride were along back roads with medium speeds. The bike ran great and didn't consume any noticeable oil. \\
-The last 200 miles were open highway and Interstate at 75 to 80 mph with strong gusts of head winds.
+The last 200 miles were open highway and Interstate at 75 to 80 mph with strong gusts of head winds. \\
 Again, the inline filter was overwhelmed, the hose connections leaked and more than a quart of oil was lost. \\
 This suggests that the vent in the cam cover becomes saturated with oil when the engine is being run hard. \\
 **Cam cover vent baffle added**: \\
+**Caution**: The rocker box should be loosened / removed before removing the cam cover to prevent damage to the cam bushings. \\
+See [[techtalk:evo:engmech04a|Removing the Rocker Boxes]] in the Evo section of the Sportsterpedia. \\
+See also [[techtalk:evo:engmech01#removing_the_cam_cover|Removing the Cam Cover]]. \\
 This was done to reduce the amount of oil that is making it into the vent line itself. \\
 The oil tank vent fitting is located right beside one of the cam gears. \\
@@ Line 126: / Line 134: @@
 |Vent location inside the cam cover. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=12)) |A screw hole and two drain holes drilled. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=12))|
-|{{:techtalk:ref:oil:04_up_crankcase_vent_11_by_deimus.jpg?direct&300|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_13_by_deimus.jpg?direct&300|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_11_by_deimus.jpg?direct&300|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_13_by_deimus.jpg?direct&300|}}|
 |An aluminum baffle was fabricated. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=12))|Finished baffle shown. ((photo by Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=12))|
-|{{:techtalk:ref:oil:04_up_crankcase_vent_12_by_deimus.jpg?direct&250|}}|{{:techtalk:ref:oil:04_up_crankcase_vent_14_by_deimus.jpg?direct&300|}}|
+|{{techtalk:ref:engmech:04_up_crankcase_vent_12_by_deimus.jpg?direct&250|}}|{{techtalk:ref:engmech:04_up_crankcase_vent_14_by_deimus.jpg?direct&300|}}|
@@ Line 160: / Line 168: @@
 With the inline glass filter and clear hose, you can clearly see oil gurgling inside. \\
+====== Conclusions from this mod ======
+Installing a PCV on the oil tank vent line did not help in creating more efficient flow of oil in the subject engine. \\
+In fact, it increased operating temps and didn't stop the loss of oil. \\
+Having a check valve is part of the solution. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=17)) \\
+Allowing a pulsing of air into and out of the engine can only compound the oil venting problems at best. \\
+A worse effect is that the presence of that air in the crankcase on the down strokes of the pistons will cost some engine power as these gasses are compressed. \\
+The engine is working harder with this fix to sustain 80mph than it did to sustain 4000 rpm in 3rd going 60mph. \\
+This should explain the temps in the different situations: ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=20)) \\
+Running 4000 rpm going 60mph, the temp was 220°F. \\
+Running 60mph in 5th gear and the temp was only 200°F. \\
+Running 80mph in 5th and the temp was 250°F. \\
+These three examples were all sustained runs of 15 minutes or more in each situation. \\
+The location of the factory vent fitting in the cam cover that was used for the "Tee" vent mod is very close to the cam gears. ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=22)) \\
+The Tee mod worked pretty well except for high speed cruising. \\
+So much oil is being slung around that fitting in those conditions that adding a vent there will be oily. \\
+Based on these findings, adding the custom vent in the cam cover along with an oil splash guard is the better way to go. \\
+That mod is detailed here: [[techtalk:ref:engmech05d|Installing the Ultimate Crankcase Vent]] \\
 \\

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