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techtalk:ref:engmech04g [2019/11/08 00:59]
hippysmack [Test with reduced breather bolt orifices]
techtalk:ref:engmech04g [2020/10/25 23:35] (current)
hippysmack [REF: Engine Mechanicals - Sub-04G]
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 [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]] [[:​techtalk:​menu|{{ ​ :​techtalk:​gototechnicalmenu.jpg|}}]]
 ====== REF: Engine Mechanicals - Sub-04G ====== ====== REF: Engine Mechanicals - Sub-04G ======
 +
 +See also in the Sportsterpedia:​ \\
 +
 +  * [[techtalk:​ref:​tools173#​manometer_slack_tube_for_measuring_air_pressure|Manometer (slack tube) for Measuring Air Pressure]]
 +  * [[techtalk:​ref:​engmech04e|Building Your Own Slack Tube]]
 +  * [[techtalk:​ref:​genmsr04#​using_diagnosing_with_a_slack_tube_manometer|Using / Diagnosing with a Slack Tube (Manometer)]]
 +  * [[techtalk:​ref:​engmech04|Evo Crankcase Pressure and Engine Breathing]]
 +  * [[techtalk:​ref:​engmech07p|Testing with a Slack Tube (Manometer) by bustert]]
 +  * [[techtalk:​ref:​genmsr04#​using_diagnosing_with_a_slack_tube_manometer|Using / Diagnosing with a Slack Tube (Manometer)]]
 +  * [[techtalk:​ref:​oil05#​engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]]
 +  * [[techtalk:​ref:​oil10|Wet Sumping]]
 +  * [[techtalk:​ref:​engmech05|Breather Venting / Relocation]]
 +
 \\ \\
 ====== Slack tube testing on a 1998 1250S model  ====== ====== Slack tube testing on a 1998 1250S model  ======
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 {{:​techtalk:​evo:​engmech:​making_91-03_breather_bolt_holes_smaller_pic_5_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=84)) {{:​techtalk:​evo:​engmech:​making_91-03_breather_bolt_holes_smaller_pic_5_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=84))
 {{:​techtalk:​evo:​engmech:​making_91-03_breather_bolt_holes_smaller_pic_7_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=84)) \\ {{:​techtalk:​evo:​engmech:​making_91-03_breather_bolt_holes_smaller_pic_7_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=84)) \\
 +
 +{{:​techtalk:​ref:​engmech:​hst_testing_reference_zero_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=79)) {{:​techtalk:​ref:​engmech:​hst_testing_2_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=82)) \\
  
 {{:​techtalk:​ref:​engmech:​hst_testing_3-1_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) {{:​techtalk:​ref:​engmech:​hst_testing_3-2_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) {{:​techtalk:​ref:​engmech:​hst_testing_3-2_restriction_at_2000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) \\ {{:​techtalk:​ref:​engmech:​hst_testing_3-1_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) {{:​techtalk:​ref:​engmech:​hst_testing_3-2_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) {{:​techtalk:​ref:​engmech:​hst_testing_3-2_restriction_at_2000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) \\
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 The slack tube was hooked up to help diagnose the problem. \\ The slack tube was hooked up to help diagnose the problem. \\
  
 +{{:​techtalk:​ref:​engmech:​hst_testing_reference_zero_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=79)) \\
 +
 +Before the new umbrellas, 3-3/4" (7-1/​2"​ WC) of vacuum was lost while removing the oil cap and the engine died when removing the cap. \\
 +The idle changed with slight movements of the cap being closer to or farther away from the oil tank neck opening. \\
 +There was oil frothing in the oil tank with the cap off at idle. The frothing got less when the cap was '​slightly'​ off. \\
 +It didn't have any affect pulling the cap at cold idle. \\
 +
 +{{:​techtalk:​ref:​engmech:​hst_testing_1_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=79)) {{:​techtalk:​ref:​engmech:​hst_testing_oil_cap_removed_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=79)) \\
 +
 +The umbrellas were replaced with new ones and the test performed again. \\
 +The overall vacuum decreased at idle with the new umbrellas. \\
 +When the oil cap was removed, only 2-1/4" (4-1/​2"​ WC) was lost and there was only a slight pitch change in the engine with no noticeable amount on the tach. \\
 +No frothing in the oil tank now with the cap removed at idle. So it appears the problem was a stiff umbrella valve (rear). \\
 +
 +{{:​techtalk:​ref:​engmech:​hst_testing_2_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=82)) ​ {{:​techtalk:​ref:​engmech:​hst_testing_2_at_1000_rpm_no_oil_cap_by_hippysmack.jpg?​direct&​300|}} ​    ​((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=84)) \\
 +
 +===== Test with air cleaner removed =====
 +The A/C was removed to see if it had any impact on crankcase pressure testing. \\
 +There was no noticeable difference with it off through the RPM range tested up to 5000. \\
 +There was also no noticeable oil mist during this period. \\
 +Condensation and light oil mist accumulation at the bolts was from original testing before replacing the umbrellas. \\
 +But none of this is was in the filter and no oil puking. \\
 +
 +{{:​techtalk:​ref:​engmech:​hst_testing_2_at_1000_rpm_no_ac_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=82))
 +{{:​techtalk:​ref:​engmech:​hst_testing_2_ac_removed_at_1000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=82)) ​ \\
  
 \\ \\