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techtalk:ref:engmech04j [2020/10/07 03:45] hippysmack [REF: Engine Mechanicals - Sub-04L] |
techtalk:ref:engmech04j [2024/01/14 21:50] hippysmack |
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| ====== Further Study of Evo Sportster Breather Valves ====== | ====== Further Study of Evo Sportster Breather Valves ====== | ||
| - | See the respective sections in the Sportsterpedia for the different breather valves used on Sportsters. \\ | + | |
| - | * [[techtalk:ih:engmech07|IH Crankcase Ventilation (1957-1985)]] \\ | + | See also in the REF section of the Sportsterpedia: \\ |
| + | * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) | ||
| + | * [[techtalk:ref:engmech05|Breather Venting / Relocation]] | ||
| * [[techtalk:evo:engmech07|Evo Crankcase Ventilation (1986-Up)]] \\ | * [[techtalk:evo:engmech07|Evo Crankcase Ventilation (1986-Up)]] \\ | ||
| + | \\ | ||
| + | |||
| + | ====== Comparing L1984 and 1991 Umbrella Valves ====== | ||
| + | L1984-1990 umbrella valve (26856-82). \\ | ||
| + | 1991-2003 umbrella valve (26856-89). \\ | ||
| + | |||
| + | **Dims**: ((Gary E of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/195092-rigid-evo-oil-check-ball-spring/page8?t=2071387&page=8)) \\ | ||
| + | Outside diameter: \\ | ||
| + | L1984 - 1.25" \\ | ||
| + | 1991 - 1.0" \\ | ||
| + | Edge thickness (1/8" in average): \\ | ||
| + | L1984 - 0.036" \\ | ||
| + | 1991 - 0.041" \\ | ||
| + | * The pic below shows the left side (filter side) that faces into the cam box. | ||
| + | * It's center inside diameter is slightly larger than the 1.25" OD (-82) umbrella valve. | ||
| + | * The two 'C' shaped slots that do the breathing have an OD of 1". | ||
| + | * As a result, the 91-03 umbrella valve with its diameter of 1" may not perform correctly in L84-90 models since there is likely to be leakage. | ||
| + | |{{:techtalk:evo:oil:umbrella_valve_by_gary_e.jpg?direct&300|}}|{{:techtalk:evo:oil:breather_baffle_tube_by_gary_e.jpg?direct&300|}}| | ||
| + | | Umbrella (check) Valves \\ L - (26856-82), R - (26856-89) ((photo by Gary E of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071387&page=8)) | Breather Baffle Tube (26917-84) ((photo by Gary E of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071387&page=8http://xlforum.net/forums/showthread.php?t=2071387&page=8)) | | ||
