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techtalk:ref:engmech07g [2020/10/15 05:20] 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| | | ||
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| {{:techtalk:ref:engmech:1957-1971_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\ | {{: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)) \\ |
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| + | {{:techtalk:ref:engmech:1977-present_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\ | ||
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| + | |||
| + | ===== Comparing Amount of Vacuum Created ===== | ||
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| + | {{:techtalk:ref:engmech:1957-1976_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
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| + | {{:techtalk:ref:engmech:1972-1985_sportster_crankcase_vacuum_comparison_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
| \\ | \\ | ||
