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techtalk:ref:engmech04 [2019/08/13 17:26] hippysmack [Air Leaks] |
techtalk:ref:engmech04 [2019/10/11 19:54] hippysmack [Vacuum Pressure] |
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{{:techtalk:ref:engmech:86-90_sportster_positive_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:ref:engmech:86-90_sportster_negative_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | {{:techtalk:ref:engmech:86-90_sportster_positive_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:ref:engmech:86-90_sportster_negative_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | ||
- | 91-03 models with head breather vents: \\ | + | 91-97 models with head breather vents: \\ |
- | {{:techtalk:ref:engmech:91-03_sportster_positive_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:ref:engmech:91-03_sportster_negative_crankcase_pressure_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | + | {{:techtalk:ref:engmech:91-97_sportster_positive_crankcase_pressure_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:engmech:91-97_sportster_negative_crankcase_pressure_by_hippysmack.jpg?direct&300|}} \\ |
+ | |||
+ | 98-03 models with head breather vents: \\ | ||
+ | {{:techtalk:ref:engmech:98-03_sportster_positive_crankcase_pressure_by_hippysmack.jpg?direct&300|}} {{:techtalk:ref:engmech:98-03_sportster_negative_crankcase_pressure_by_hippysmack.jpg?direct&300|}} \\ | ||
04 and Up models with head breather vents: \\ | 04 and Up models with head breather vents: \\ | ||
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|{{:techtalk:ref:engmech:86-90_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:91_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:86-90_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:91_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}| | ||
- | | 92-03 engine breathing paths. ((drawing by Hippysmack)) | 04 and Up engine breathing paths. ((drawing by Hippysmack)) | | + | | 92-97 engine breathing paths. ((drawing by Hippysmack)) | 98-03 engine breathing paths. ((drawing by Hippysmack)) | 04 and up engine breathing paths. ((drawing by Hippysmack)) | |
- | |{{:techtalk:ref:engmech:92-03_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:04_and_up_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}| | + | |{{:techtalk:ref:oil:92-97_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:98-03_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:oil:04_and_up_sportster_engine_breathing_by_hippysmack.jpg?direct&300|}}| |
| Testing CC pressure on the dyno. ((photo by Jörgen http://xlforum.net/forums/showthread.php?t=75740&page=9)) | | | Testing CC pressure on the dyno. ((photo by Jörgen http://xlforum.net/forums/showthread.php?t=75740&page=9)) | | ||
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Wet sumping is only one potential problem you may encounter with them. ((maru of the XLFORUM http://xlforum.net/forums/showthread.php?p=3780510#post3780510)) \\ | Wet sumping is only one potential problem you may encounter with them. ((maru of the XLFORUM http://xlforum.net/forums/showthread.php?p=3780510#post3780510)) \\ | ||
In the right application they can not be beat but you better have your ducks in a row. \\ | In the right application they can not be beat but you better have your ducks in a row. \\ | ||
+ | |||
+ | **Buell crankcase breathing**: \\ | ||
+ | | This is a Buell XBRR with reed valves through the cam chest wall. ((photos by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=829935)) || | ||
+ | |{{:techtalk:ref:engmech:reed_valves_1_on_buell_xbrr_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:reed_valves_2_on_buell_xbrr_by_aswracing.jpg?direct&300|}}| | ||
+ | |||
===== Why Oil Pukes Out the Air Cleaner ===== | ===== Why Oil Pukes Out the Air Cleaner ===== | ||
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So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | ||
+ | |||
+ | ===== Breather Catch Can Test For Oil Leaks Out the Vent ===== | ||
+ | A test was done by XLFORUM member cjburr. Test apparatus and results are below. ((cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=13)) \\ | ||
+ | This testing was done to help diagnose an oil leak that couldn't be seen or otherwise detected. \\ | ||
+ | However, this may be a good exercise if you are concerned about how much oil you may be losing from the crankcase puking. \\ | ||
+ | It should show what, how much and when oil accumulates in the hose / catch can. \\ | ||
+ | The length / size of tubing will change crankcase pressure to an extent so the results may not reflect exactly what's going on inside your engine. \\ | ||
+ | |||
+ | The vent to air cleaner was inspected and then removed for testing. The factory system routes the breathers to the front of the carb. \\ | ||
+ | There was no evidence of the amount of oil that was being lost in the intake tract. \\ | ||
+ | With the Forcewinder A/C removed, there was no evidence of oil. | ||
+ | A homemade catch can with a vent hole and a clear tube was installed to inspect while riding. \\ | ||
+ | |||
+ | | A/C removed. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=13)) || Homemade catch can. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=13)) | | ||
+ | |{{:techtalk:ref:engmech:breather_catch_can_test_1_by_cjburr.jpg?direct&300|}}|{{:techtalk:ref:engmech:breather_catch_can_test_2_by_cjburr.jpg?direct&300|}}|{{:techtalk:ref:engmech:breather_catch_can_test_3_by_cjburr.jpg?direct&300|}}| | ||
+ | |||
+ | The A/C was re-installed with the venting ran to the catch can. \\ | ||
+ | The oil tank was filled to just under half way up the stick with SYN3. \\ | ||
+ | The bike was ridden hard (10 miles of city driving then 50 miles of elevated speeds). \\ | ||
+ | RPM was ran up to 6000 in 5th (8 times) and up to 100 MPH for 2 miles twice. \\ | ||
+ | Total miles run were 75 and all but 20 miles of that were at 80 MPH or more. \\ | ||
+ | The only thing that showed up in the tube running to the catch can was just some moisture but no oil. \\ | ||
+ | | The catch can was clean but 1/4 quart of oil had been lost as viewed from the dipstick. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=13)) ||| | ||
+ | |{{:techtalk:ref:engmech:breather_catch_can_test_4_by_cjburr.jpg?direct&300|}}| {{:techtalk:ref:engmech:breather_catch_can_test_5_by_cjburr.jpg?direct&300|}}|{{:techtalk:ref:engmech:breather_catch_can_test_6_by_cjburr.jpg?direct&200|}}| | ||
+ | |||
+ | |||
===== Breather Valves ===== | ===== Breather Valves ===== | ||
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</blockquote> | </blockquote> | ||
- | ====== Air Leaks ====== | + | ===== Head Vents vs Cam Chest Vent ===== |
- | The breathing system is designed for a one-way valve venting system. \\ | + | |
- | Air goes out but doesn't come back in. \\ | + | |
- | Air leaks (into the engine) will increase positive pressure and air / oil density = oil puking out the breathers. \\ | + | |
- | Some potential air leak areas are in the pic below. \\ | + | |
- | If these areas allow air to be pulled in the engine on upstroke, the added air will compound any other existing breathing problems. \\ | + | |
- | {{:techtalk:ref:engmech:potential_cc_pressure_leaks_at_the_rocker_box_by_daggar_rider_labeled_by_hippysmack.jpg?direct&300|}} ((photo by dagger rider of the XLFORUM )) | + | |
- | + | ||
- | ====== Head Vents vs Cam Chest Vent ====== | + | |
CC pressure (while venting thru the heads) was [[techtalk:ref:engmech04#head_vents_vs_cam_chest_vent|tested with a slack tube]] as in above. \\ | CC pressure (while venting thru the heads) was [[techtalk:ref:engmech04#head_vents_vs_cam_chest_vent|tested with a slack tube]] as in above. \\ | ||
Results of the testing showed that the test bike did perform as designed using breathers in the rocker boxes. \\ | Results of the testing showed that the test bike did perform as designed using breathers in the rocker boxes. \\ | ||
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Oil was introduced into the head with a with a turkey baster. \\ | Oil was introduced into the head with a with a turkey baster. \\ | ||
(which is probably a higher volume of oil than it normally sees from the splash oiling) \\ | (which is probably a higher volume of oil than it normally sees from the splash oiling) \\ | ||
+ | However, if the drains were plugged, oil would overfill to the point of spewing oil at the seams and submerge the seals. ((cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=33)) \\ | ||
| Head ready for testing. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) | Oil poured in and draining. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) |Oil level at the intake valve when it starts to drain to \\ the exhaust side. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) | | | Head ready for testing. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) | Oil poured in and draining. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) |Oil level at the intake valve when it starts to drain to \\ the exhaust side. ((photo by cjburr of the XLFORUM http://xlforum.net/forums/showthread.php?t=53769&highlight=valve+guide&page=31)) | | ||
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The scavenge inlet sees pressure but is isolated from the vacuum when the pistons go back up. \\ | The scavenge inlet sees pressure but is isolated from the vacuum when the pistons go back up. \\ | ||
</blockquote> | </blockquote> | ||
+ | |||
+ | |||
====== Wetsumping ====== | ====== Wetsumping ====== | ||
Click to read the full article on [[techtalk:ref:oil10#wet_sumping|wetsumping]] in the REF section of the Sportsterpedia. \\ | Click to read the full article on [[techtalk:ref:oil10#wet_sumping|wetsumping]] in the REF section of the Sportsterpedia. \\ | ||
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A slightly negative (to atmospheric) pressure in the tank facilitates vaporization of the condensate. \\ | A slightly negative (to atmospheric) pressure in the tank facilitates vaporization of the condensate. \\ | ||
+ | ====== Air Leaks ====== | ||
+ | The breathing system is designed for a one-way valve venting system. \\ | ||
+ | Air goes out but doesn't come back in. \\ | ||
+ | Air leaks (into the engine) will increase positive pressure and air / oil density = oil puking out the breathers. \\ | ||
+ | Some potential air leak areas are in the pic below. \\ | ||
+ | If these areas allow air to be pulled in the engine on upstroke, the added air will compound any other existing breathing problems. \\ | ||
+ | {{:techtalk:ref:engmech:potential_cc_pressure_leaks_at_the_rocker_box_by_daggar_rider_labeled_by_hippysmack.jpg?direct&300|}} ((photo by dagger rider of the XLFORUM )) | ||
====== Vacuum Pump for Reducing Crankcase Pressure ====== | ====== Vacuum Pump for Reducing Crankcase Pressure ====== |