Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Last revision Both sides next revision
techtalk:ref:engmech05 [2019/07/21 01:40]
hippysmack [Pics of Aftermarket Breather Valves]
techtalk:ref:engmech05 [2019/11/14 04:14]
hippysmack [Vent Outlet Above vs Below the Head Vents]
Line 31: Line 31:
 However, exact line routing comes down to function over fashion. \\ However, exact line routing comes down to function over fashion. \\
 While it may look better or cleaner for the lines to be routed above the air cleaner; \\ While it may look better or cleaner for the lines to be routed above the air cleaner; \\
-Doing so doesn'​t make for good functioning of the breather system. \\+Doing so doesn'​t ​necessarily ​make for good functioning of the breather system. \\ 
 +That also can be debated. \\
  
 The air / oil that gets blown out is a combination of crankcase pressure and engine blowby. \\  The air / oil that gets blown out is a combination of crankcase pressure and engine blowby. \\ 
-Blowby ​gasses produce a corrosive vapor which doesn'​t need to go back into the engine. \\ +The argument is blowby ​gasses produce a corrosive vapor which doesn'​t need to go back into the engine. \\ 
-It'll simply pool in the heads / vent lines. \\+It'll simply pool in the heads / vent lines and become an emulsified goop. \\
 Mounting vent lines higher than the head vents is counterproductive to quick air/​oil/​condensate removal. \\ Mounting vent lines higher than the head vents is counterproductive to quick air/​oil/​condensate removal. \\
 It's the quick removal that helps prevent sludge buildup. \\ It's the quick removal that helps prevent sludge buildup. \\
Line 46: Line 47:
  
 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. \\
-When that air cools, the oil mist falls out of suspension and collects in the vent lines. \\+When that air cools, the oil mist falls out of suspension and collects in the vent lines and mixing with unsuspended oil droplets. \\
 Pointing the vent lines straight into the A/C (OEM) or down into a catch can allows the oil out of suspension to leave the vent lines. \\ Pointing the vent lines straight into the A/C (OEM) or down into a catch can allows the oil out of suspension to leave the vent lines. \\
  
Line 52: Line 53:
 However, pointing the vent lines upward of the head vents allows oil out of suspension to collect in them. \\ However, pointing the vent lines upward of the head vents allows oil out of suspension to collect in them. \\
 Once there is enough liquid oil in the upward breather tubes it will act just like the trap under your sink. \\ Once there is enough liquid oil in the upward breather tubes it will act just like the trap under your sink. \\
-It may block air from getting out until the engine (on startup) builds enough pressure to push the liquid and bubble up to the top. \\+It may restrict or block air from getting out until the engine (on startup) builds enough pressure to push the liquid and bubble up to the top. \\
 So it may affect crankcase pressure slightly until the lines are cleared. \\ So it may affect crankcase pressure slightly until the lines are cleared. \\
 Or the trapped oil may simply be blown out the vent lines in globs. \\ Or the trapped oil may simply be blown out the vent lines in globs. \\
Line 75: Line 76:
 However, the goop (emulsified oil) is a restriction to crankcase pressure leaving the engine until it is cleared. \\ However, the goop (emulsified oil) is a restriction to crankcase pressure leaving the engine until it is cleared. \\
  
-{{:​techtalk:​ref:​engmech:​horseshoe_breather_tube_mounted_high_1_by_hippysmack.jpg?​direct&​400|}} ((drawing by Hippysmack)) {{:​techtalk:​ref:​engmech:​horseshoe_breather_tube_mounted_high_2_by_hippysmack.jpg?​direct&​400|}} ((drawing by Hippysmack)) \\+{{:​techtalk:​ref:​engmech:​ahorseshoe_breather_tube_mounted_high_1_by_hippysmack.jpg?​direct&​400|}} ((drawing by Hippysmack)) {{:​techtalk:​ref:​engmech:​ahorseshoe_breather_tube_mounted_high_2_by_hippysmack.jpg?​direct&​400|}} ((drawing by Hippysmack)) \\
  
 |Horseshoe tube, high mount / vent line in front. ((photo by OakBehringer of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2004878))|Rear bolt covered in sludge. ((photo by OakBehringer of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2004878))|Filter mounted high will receive built up sludge. ((photo by AustinXL of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1507294))| |Horseshoe tube, high mount / vent line in front. ((photo by OakBehringer of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2004878))|Rear bolt covered in sludge. ((photo by OakBehringer of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2004878))|Filter mounted high will receive built up sludge. ((photo by AustinXL of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=1507294))|
Line 111: Line 112:
 To stop a leak, you may be tempted to tighten the bolts even more. \\ To stop a leak, you may be tempted to tighten the bolts even more. \\
 This could result in breaking the bolt. \\ This could result in breaking the bolt. \\
 +
 +On 04-up heads, changing to aftermarket breather bolts means using bolts with the bigger I.D. (91-03) style bolts. \\
 +The results of using the bigger holed bolt would be a slower rate of outflow and less positive crankcase pressure on a stock motor. ((Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=4)) \\
 +But the timing of the upstroke is the same which then pulls a vacuum. \\
 +The umbrella valve will close down only when inside air pressure is lower than outside air pressure. \\
 +If the inside pressure can't get out fast enough before piston upstroke happens the umbrella may '​float'​ or not close all the way. \\
 +If the umbrella floats, X amount of extra air is pulled in until it does close. \\
 +(on top of what didn't get completely out on the last downstroke = more air in the engine on the next downstoke = oil puking out the breather). \\
 +How much slower the bigger bolt hole yields will vary with different engines. \\
 +
 +However, the smaller holed bolts were designed to OEM specs internally. \\
 +If you've upgraded to bigger pistons, there will be more positive pressure displaced out the breathers on downstroke. \\
 +This may negate the need for higher pressure generated by the smaller holed bolts. \\
 +This may be something you'd want to watch since there isn't sufficient data to prove one way or the other. \\
  
 {{:​techtalk:​ref:​engmech:​breather_mod_2_by_hagen.jpg?​direct&​300|}} ((photo by Hagen of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=146084&​page=11)) {{:​techtalk:​ref:​engmech:​ds_breather_bolt_by_hagen.png?​direct&​300|}} ((photo by Hagen of theXLFORIM http://​xlforum.net/​forums/​showthread.php?​t=692845)) {{:​techtalk:​ref:​engmech:​broken_banjo_bolt_by_scout99.jpg?​direct&​200|}} ((photo by Scout99 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=28299)) {{:​techtalk:​ref:​engmech:​breather_mod_2_by_hagen.jpg?​direct&​300|}} ((photo by Hagen of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=146084&​page=11)) {{:​techtalk:​ref:​engmech:​ds_breather_bolt_by_hagen.png?​direct&​300|}} ((photo by Hagen of theXLFORIM http://​xlforum.net/​forums/​showthread.php?​t=692845)) {{:​techtalk:​ref:​engmech:​broken_banjo_bolt_by_scout99.jpg?​direct&​200|}} ((photo by Scout99 of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=28299))
Line 148: Line 163:
 ====== Pics of Aftermarket Breather Valves ====== ====== Pics of Aftermarket Breather Valves ======
  
-|Doherty Power Vents with the line routed up then \\ down and attached to the bottom of the frame. ((photo by RIORoosen of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=146084&​page=18))|Hayden KVP38 breather valve, used with the \\ [[techtalk:​ref:​engmech05d|Deimus Mod]] (cam chest breather conversion). ((photo by 60Gunner of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=5763918#​post5763918))| +|Doherty Power Vents with the line routed up then \\ down and attached to the bottom of the frame. ((photo by RIORoosen of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=146084&​page=18))
-|{{:​techtalk:​ref:​engmech:​breather_mod_by_rioroosen.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​deimus_mod_8_by_60gunner.jpg?​direct&​300|}}|+|{{:​techtalk:​ref:​engmech:​breather_mod_by_rioroosen.jpg?​direct&​300|}}| 
 + 
 +|Hayden KVP38 breather valve, used with the \\ [[techtalk:​ref:​engmech05d|Deimus Mod]] (cam chest breather conversion). ((photo by 60Gunner of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=5763918#​post5763918))|  Hayden breather opened up. ((photos by leucadiaGuit of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2004869 cropped by Hippysmack)) ​ |
 +|{{:​techtalk:​ref:​engmech:​deimus_mod_8_by_60gunner.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​hayden_krankvent_3_by_leucadiaguit_-_cropped.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​hayden_krankvent_2_by_leucadiaguit_-_cropped.jpg?​direct&​300|}}|