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
Next revision Both sides next revision
techtalk:ref:engmech04g [2019/11/08 00:54]
hippysmack
techtalk:ref:engmech04g [2020/10/25 23:30]
hippysmack [REF: Engine Mechanicals - Sub-04G]
Line 1: Line 1:
 [[:​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:​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  ======
Line 121: Line 133:
 {{:​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)) \\
Line 126: Line 140:
 {{:​techtalk:​ref:​engmech:​hst_testing_3-2_restriction_at_3000_rpm_by_hippysmack_2_.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_4000_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_5000_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_3000_rpm_by_hippysmack_2_.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_4000_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_5000_rpm_by_hippysmack.jpg?​direct&​300|}} ((photo by Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=2073932&​page=85)) \\
  
 +===== Test for oil cap issue when removed at idle =====
 +Before the umbrellas were replaced it was noticed that, at hot idle and the oil cap removed, the engine speed would stumble and sometimes shut down. \\
 +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)) ​ \\
  
 \\ \\