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techtalk:ref:engmech04 [2019/12/07 03:35] hippysmack [Vacuum (differential) Pressure] |
techtalk:ref:engmech04 [2020/02/10 16:52] hippysmack [Why Oil Pukes Out the Air Cleaner] |
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{{:techtalk:ref:engmech:differential_pressure_drawing_1_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) | {{:techtalk:ref:engmech:differential_pressure_drawing_1_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) | ||
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+ | Differential pressure as it applies to the Sportster breathing system: \\ | ||
{{:techtalk:ref:engmech:negative_pressure_drawing_1_by_hippysmack.jpg?direct&400|}} ((photo by Hippysmack)) {{:techtalk:ref:engmech:positive_pressure_drawing_1_by_hippysmack.jpg?direct&400|}} \\ | {{:techtalk:ref:engmech:negative_pressure_drawing_1_by_hippysmack.jpg?direct&400|}} ((photo by Hippysmack)) {{:techtalk:ref:engmech:positive_pressure_drawing_1_by_hippysmack.jpg?direct&400|}} \\ | ||
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Applying the same principles, you can see the relation of positive and negative crankcase pressure in the Sportster engine. \\ | Applying the same principles, you can see the relation of positive and negative crankcase pressure in the Sportster engine. \\ | ||
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Results: \\ | Results: \\ | ||
- | Sportsters move the least amount of air through the breathers. | + | Sportsters move the least amount of air through the breathers. \\ |
Twin Cams move the most amount of air through the breathers, with little difference between air cooled and Twin Cooled. \\ | Twin Cams move the most amount of air through the breathers, with little difference between air cooled and Twin Cooled. \\ | ||
Milwaukee-Eights move more air than Sportsters, but little more than half as much as the Twin Cams through the breathers. \\ | Milwaukee-Eights move more air than Sportsters, but little more than half as much as the Twin Cams through the breathers. \\ | ||
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====== Engine Breathing ====== | ====== Engine Breathing ====== | ||
+ | Typical automobile V-8 engine breathing: ((drawing by Hippysmack)) \\ | ||
+ | {{:techtalk:ref:engmech:v-8_engine_breather_system_by_hippysmack.jpg?direct&400|}} \\ | ||
Engine ventilation is connected to the rockerbox, crankcase, cam gear case and the oil tank. ((bunny32 of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=3)) \\ | Engine ventilation is connected to the rockerbox, crankcase, cam gear case and the oil tank. ((bunny32 of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=3)) \\ | ||
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| This is a Buell XBRR with reed valves through the cam chest wall. ((photos by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=829935)) || | | This is a Buell XBRR with reed valves through the cam chest wall. ((photos by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=829935)) || | ||
|{{:techtalk:ref:engmech:reed_valves_1_on_buell_xbrr_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:reed_valves_2_on_buell_xbrr_by_aswracing.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:reed_valves_1_on_buell_xbrr_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:reed_valves_2_on_buell_xbrr_by_aswracing.jpg?direct&300|}}| | ||
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+ | ====== Symptoms of Breather problems ====== | ||
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So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | ||
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===== Breather Catch Can Test For Oil Leaks Out the Vent ===== | ===== Breather Catch Can Test For Oil Leaks Out the Vent ===== |