Differences

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--- techtalk:ref:engmech05 [2019/07/26 17:34]
hippysmack [Vent Outlet Above vs Below the Head Vents]
+++ techtalk:ref:engmech05 [2019/11/14 04:14]
hippysmack [Vent Outlet Above vs Below the Head Vents]
@@ Line 76: / Line 76: @@
 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))|
@@ Line 112: / Line 112: @@
 To stop a leak, you may be tempted to tighten the bolts even more. \\
 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))
@@ Line 149: / Line 163: @@
 ====== 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|}}|

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