Differences

This shows you the differences between two versions of the page.

--- techtalk:ref:engmech07g [2020/10/15 04:22]
hippysmack [Breather Gear Timing Events]
+++ techtalk:ref:engmech07g [2020/10/23 20:47]
hippysmack [Breather Gear Specs and Information]
@@ 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 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))||
 |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))
+====== Breather Gear Pics ======
+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 ======
-This drawing shows the timing events of the 57-71 timed breather gear for 1 crank revolution for the front cylinder. \\
+===== Timing events for 1 crank rev =====
 {{:techtalk:ref:engmech:1957-1971_sportster_timed_breather_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
 \\
-This one shows how the pressures change in the crankcase per 1 revolution. \\
+|Timing events of the 72-76 timed breather gear for 1 crank revolution for the front cylinder. \\
-{{:techtalk:ref:engmech:1957-1971_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
+===== Pressures changes in the crankcase for 1 rev =====
-\\
+{{:techtalk:ref:engmech:1957-1971_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)) \\
-====== Breather Gear Pics ======
+{{:techtalk:ref:engmech:1977-present_sportster_crankcase_pressure_cycle_by_hippysmack.png?direct&600|}} ((drawing by Hippysmack)) \\
-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))|
+===== Comparing Amount of Vacuum Created =====
-|{{: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|}}|
+{{: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)) \\
 \\
 [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]

Trace:

Differences

Navigation

Search

Toolbox