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techtalk:ih:engmech07 [2019/10/11 23:40] hippysmack |
techtalk:ih:engmech07 [2019/12/04 00:33] hippysmack [76< Timed Breather Valve] |
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| |{{:techtalk:ih:engmech:cc_flow_6_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_7_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_8_by_dr_dick.jpg?direct&300|}}| | |{{:techtalk:ih:engmech:cc_flow_6_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_7_by_dr_dick.jpg?direct&300|}}|{{:techtalk:ih:engmech:cc_flow_8_by_dr_dick.jpg?direct&300|}}| | ||
| + | \\ | ||
| + | There are only 3 rotor and tower slot widths for all 1937-76 4-cam engines (45, K, KH, XL, UL), which determine the complete breather timing interval. ((kitabel of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=87)) \\ | ||
| + | - Rotor .375" (88°) + tower .34375" (81°) = 169°: \\ all non-R 1937-71 engines; the exact opening-closing points vary between engines; 1952-71 K &c. slots are taller than 45 & UL. | ||
| + | - Rotor .594" (146°) + tower .34375" (81°) = 227°: 1972-76 XL; these slots are also taller than 45 & UL. | ||
| + | - Rotor .214" (99°) + tower .269 (125°) = 224°: all 1954-? KR, KHR, XLR (many mods to this) | ||
| ===== 77-78 Breather Valve ===== | ===== 77-78 Breather Valve ===== | ||
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| {{:techtalk:ih:engmech:83_xlx_crankcase_vent_mod_by_83xlx.jpg?direct&300|}} ((photo by 83XLX of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather&page=3)) | {{:techtalk:ih:engmech:83_xlx_crankcase_vent_mod_by_83xlx.jpg?direct&300|}} ((photo by 83XLX of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather&page=3)) | ||
| - | ===== Breather Valve Alternatives ===== | + | ====== Breather Valve Alternatives ====== |
| * There is a product called a Krankvent that can be plumbed into the lower, 6 o’clock position as an alternative to a stock foo-foo valve. But they are not cheap. | * There is a product called a Krankvent that can be plumbed into the lower, 6 o’clock position as an alternative to a stock foo-foo valve. But they are not cheap. | ||
