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techtalk:ref:oil05a [2019/06/12 18:16]
hippysmack
techtalk:ref:oil05a [2019/06/12 18:20] (current)
hippysmack [High Pressure Oil Bypass]
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 Just adding a cooler may not solve this problem. \\ Just adding a cooler may not solve this problem. \\
 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. \\
 +
 +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. \\
 +
  
 Some have found it useful to build bypass circuits to bleed off excess oil pressure and send it back to the tank. \\ Some have found it useful to build bypass circuits to bleed off excess oil pressure and send it back to the tank. \\