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techtalk:ref:engmech05 [2019/11/14 03:45] hippysmack [Vent Outlet Above vs Below the Head Vents] |
techtalk:ref:engmech05 [2020/03/01 23:29] hippysmack [Filter on End of the Vent Line] |
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| The oil would have to run uphill to get from the heads to the rocker boxes and into the lower end. \\ | The oil would have to run uphill to get from the heads to the rocker boxes and into the lower end. \\ | ||
| So there is no functional advantage to running the lines higher than the head vents. \\ | So there is no functional advantage to running the lines higher than the head vents. \\ | ||
| - | {{:techtalk:evo:engmech:a91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:a04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | + | {{:techtalk:evo:engmech:91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) |
| The air coming from the head vents has fine water condensation and oil mist particles in suspension with it. \\ | The air coming from the head vents has fine water condensation and oil mist particles in suspension with it. \\ | ||
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| The filter adds resistance to the vent pressure coming out of the engine. \\ | The filter adds resistance to the vent pressure coming out of the engine. \\ | ||
| This resistance can add to goop in the line / filter later. \\ | This resistance can add to goop in the line / filter later. \\ | ||
| + | It can also increase the vacuum inside the engine, which on a street bike, translates to weeping gaskets. \\ | ||
| The filter does not keep debris from coming back into the engine. ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=2087347)) \\ | The filter does not keep debris from coming back into the engine. ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=2087347)) \\ | ||
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| If your breather valves are in good order, nothing can get back through them. \\ | If your breather valves are in good order, nothing can get back through them. \\ | ||
| - | The exception to this would be 91-03 engines with the middle rocker box umbrella valve with the tiny hole behind it. \\ | + | The exception to this would be small oil drainback hole that keeps oil from building up between the umbrella and the outlet. \\ |
| The tiny holes next to (and slightly lower than) the umbrella valves are for draining the separated oil back into the rocker box. \\ | The tiny holes next to (and slightly lower than) the umbrella valves are for draining the separated oil back into the rocker box. \\ | ||
| However, there isn't large enough suction back on the vent line to pull debris up and into the engine. \\ | However, there isn't large enough suction back on the vent line to pull debris up and into the engine. \\ | ||
