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techtalk:ref:oil05a [2019/06/05 02:47] hippysmack [Conclusions] |
techtalk:ref:oil05a [2019/06/12 18:20] hippysmack [High Pressure Oil Bypass] |
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| You need to get the oil out of the crankcase so it does not interfere with motion of the crank and cause the heating problem in the first place. \\ | You need to get the oil out of the crankcase so it does not interfere with motion of the crank and cause the heating problem in the first place. \\ | ||
| - | The proposed approach is to bleed off excess high pressure oil from the feed side of the oil pump. \\ | + | To regulate the oil pressure you have to bleed some of it off. ((aswracing of the XLFORUM http://xlforum.net/forums/showpost.php?p=4341107&postcount=6)) \\ |
| + | 4-speeds have a spring loaded pressure regulator built into the oil filter pad that does exactly that. \\ | ||
| + | There's a passage from the filter pad into the cam box. \\ | ||
| + | If the pressure gets high enough, the regulator opens and bleeds off some of the pressurized oil, dropping it into the cam box. \\ | ||
| + | Then it eventually drains down to the crankcase and gets pumped back to the tank. \\ | ||
| + | They did away with this on 5-speed XL's though. \\ | ||
| + | Evo Big Twins have a spring loaded bleed-off regulator, as do Twinkies, XR1200's, and 08-up Buells. \\ | ||
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| + | Some have found it useful to build bypass circuits to bleed off excess oil pressure and send it back to the tank. \\ | ||
| Such that the scavaging side of the pump will be able to evacuate the oil from the crankcase before it starts to wet sump and generate the added heat. \\ | Such that the scavaging side of the pump will be able to evacuate the oil from the crankcase before it starts to wet sump and generate the added heat. \\ | ||
| + | But this does reduce oil pressure across the board, as opposed to opening a bypass when the pressure exceeds a certain point. \\ | ||
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| + | {{:techtalk:ref:oil:oil_pressure_bypass_mod_14_by_aswracing.jpg?direct&300|}} ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showpost.php?p=4341107&postcount=6)) | ||
| ====== Homemade Oil System Bypass (OSB) ====== | ====== Homemade Oil System Bypass (OSB) ====== | ||
