Differences

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--- techtalk:ref:engmech07g [2020/10/15 05:20]
hippysmack [Pressures changes in the crankcase for 1 rev]
+++ techtalk:ref:engmech07g [2023/12/20 22:30] (current)
hippysmack
@@ Line 46: / Line 46: @@
 **XL / XLCH scavenge oil path out the of the crankcase**.
-|  Oil slot. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |  Half of an oil slot. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |  Oil trap. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |
+|  Oil slot. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |  Half of an oil slot. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |  Oil trap. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |
 |{{:techtalk:ih:engmech:cc_flow_1_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_2_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_3_by_dr_dick.jpg?direct&300|}}|
-|  Another view of the oil trap. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |  Breather / oil pump installed. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |  Oil enters the pump here. ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854&page=3))  |
+|  Another view of the oil trap. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |  Breather / oil pump installed. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |  Oil enters the pump here. ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams/page3?t=1204854&page=3))  |
 |{{:techtalk:ih:engmech:cc_flow_7_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_6_by_dr_dick.jpg?direct&300|}}| {{:techtalk:ih:engmech:cc_flow_8_by_dr_dick.jpg?direct&300|}}|
@@ Line 57: / Line 57: @@
 |26331-52|1952-1955 K Models|  |
 |  Notes: | ||
-|26331-56|1956 KH / 1957-1959 Sportster|Opens 77° (ATDC) and Closes 67° (ABDC)|
+|26331-56|1956 KH / 1957-1959 Sportster|Opens 25° (ATDC) and Closes at (BDC) ((thefrenchowl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200928-ih-crankcase-pressure-and-engine-breathing/page2?t=2077939&page=2))|
-|  Notes: |Timed off front cylinder. The window is open for 170° of rotation. Full vacuum is \\ created for 113° of upstroke travel of each cylinder.||
+|  Notes: |Timed off front cylinder. The window is open for 155° of rotation. Full vacuum is created for \\ 135° of upstroke travel of each cylinder and continues to TDC front cylinder.||
-|26331-60|1956 KH, 1960-1971 Sportster|  |
+|26331-60|1956 KH, 1960-1971 Sportster|Opens 25° (ATDC) and Closes at (BDC) ((thefrenchowl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200928-ih-crankcase-pressure-and-engine-breathing/page2?t=2077939&page=2))|
-|  Notes: |Replacement for breather gear 26331-56. Timed off front cylinder. It came with the \\ new breather and scavenge gear set (26330-56)||
+|  Notes: |Replacement for breather gear 26331-56. Timed off front cylinder. It came with the \\ new breather and scavenge gear set (26330-56). The window is open for 155° of rotation. \\ Full vacuum is created for 135° of upstroke travel of each cylinder and continues to TDC \\ front cylinder.||
-|26331-72|1972-1976 XLH/XLCH|Opens 20°-25° (ATDC) and Closes 85°-90° (ABDC)|
+|26331-72|1972-1976 XLH/XLCH|Opens 20°-25° (ATDC) and Closes 85°-90° (ABDC) ((thefrenchowl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200928-ih-crankcase-pressure-and-engine-breathing/page2?t=2077939&page=2))|
-|  Notes: |Timed off front cylinder. It's open for 245° of rotation. This is the same as the \\ XR model preferred specs. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1204854))||
+|  Notes: |Timed off front cylinder. It's open for 245° of rotation. This is the same as the \\ XR model preferred specs. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/122424-breather-diagrams?t=1204854))||
 |26331-56R|1970 XR-750|  |
 |  Notes: | ||
@@ Line 75: / Line 75: @@
-|52/71 breather opens 25 deg after TDC front cyl and closes at BDC front cylinder ((thefrenchowl of the XLFORUM http://xlforum.net/forums/showthread.php?p=5853609#post5853609))
+|52/71 breather opens 25 deg after TDC front cyl and closes at BDC front cylinder ((thefrenchowl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200928-ih-crankcase-pressure-and-engine-breathing/page2#post4442634))
 ====== Breather Gear Pics ======
@@ Line 81: / Line 81: @@
 to 1976 Sportster production pump breathers: \\
-|Breather Gears ((photos by Dr Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=3272806&postcount=204)) |Some of amf's signature quality control. \\ These are 3 - 72 breather gears.((photos by Dr Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=3272806&postcount=204))|A closer view((photos by Dr Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=3272806&postcount=204))|
+|Breather Gears ((photos by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112326-a-photo-catalog-of-ironhead-parts/page14?postcount=204#post2437070)) |Some of amf's signature quality control. \\ These are 3 - 72 breather gears.((photos by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112326-a-photo-catalog-of-ironhead-parts/page14?postcount=204#post2437070))|A closer view((photos by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/112326-a-photo-catalog-of-ironhead-parts/page14?postcount=204#post2437070))|
 |{{:techtalk:ih:oil:breather_gears_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:oil:breather_gears_2_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:oil:breather_gears_3_by_dr_dick.jpg?direct&300|}}|
@@ Line 100: / Line 100: @@
 {{:techtalk:ref:engmech:1957-1971_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
-{{:techtalk:ref:engmech:AAA1972-1976_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
+{{:techtalk:ref:engmech:1972-1976_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
+{{:techtalk:ref:engmech:1977-present_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
+===== Comparing Amount of Vacuum Created =====
+{{:techtalk:ref:engmech:1957-1976_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\
+{{:techtalk:ref:engmech:1972-1985_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\
 \\

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