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techtalk:ref:engmech07g [2020/10/15 04:44] hippysmack [Pressures changes in the crankcase for 1 rev] |
techtalk:ref:engmech07g [2023/12/20 22:30] hippysmack |
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**XL / XLCH scavenge oil path out the of the crankcase**. | **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|}}| | |{{: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|}}| | |{{: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| | | |26331-52|1952-1955 K Models| | | ||
| Notes: | || | | 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| | | |26331-56R|1970 XR-750| | | ||
| Notes: | || | | 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 ====== | ||
+ | |||
+ | 1957 to 1976 Sportster production pump breathers: \\ | ||
+ | |||
+ | |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|}}| | ||
+ | |||
+ | |Left is the unmodified 1/4 speed R \\ valve. Right is the 1000 stock.|R model is the left one.| | ||
+ | |{{:techtalk:ih:engmech:cc_flow_4_by_dr_dick.jpg?direct&200|}}|{{:techtalk:ih:engmech:cc_flow_5_by_dr_dick.jpg?direct&300|}}| | ||
====== Breather Gear Timing Events ====== | ====== Breather Gear Timing Events ====== | ||
Line 92: | Line 102: | ||
{{:techtalk:ref:engmech:1972-1976_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)) \\ |
- | ====== Breather Gear Pics ====== | + | ===== Comparing Amount of Vacuum Created ===== |
- | 1957 to 1976 Sportster production pump breathers: \\ | + | {{:techtalk:ref:engmech:1957-1976_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ |
- | |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))| | + | {{:techtalk:ref:engmech:1972-1985_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ |
- | |{{: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|}}| | + | |
- | + | ||
- | |Left is the unmodified 1/4 speed R \\ valve. Right is the 1000 stock.|R model is the left one.| | + | |
- | |{{:techtalk:ih:engmech:cc_flow_4_by_dr_dick.jpg?direct&200|}}|{{:techtalk:ih:engmech:cc_flow_5_by_dr_dick.jpg?direct&300|}}| | + | |
+ | \\ | ||
- | |||
- | \\ | ||
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