Differences
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techtalk:ref:engmech07g [2020/10/15 05:03] hippysmack [Pressures changes in the crankcase for 1 rev] |
techtalk:ref:engmech07g [2020/10/23 20:47] hippysmack [Breather Gear Specs and Information] |
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| |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 http://xlforum.net/forums/showthread.php?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 http://xlforum.net/forums/showthread.php?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 http://xlforum.net/forums/showthread.php?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 http://xlforum.net/forums/showthread.php?t=1204854))|| | ||
| |26331-56R|1970 XR-750| | | |26331-56R|1970 XR-750| | | ||
| Line 76: | Line 76: | ||
| |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 http://xlforum.net/forums/showthread.php?p=5853609#post5853609)) | ||
| + | |||
| + | ====== Breather Gear Pics ====== | ||
| + | |||
| + | 1957 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))| | ||
| + | |{{: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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| - | \\ | ||
| [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] | ||
