Differences

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--- techtalk:ref:engmech04g [2019/11/08 00:53]
hippysmack [Testing from cold startup]
+++ techtalk:ref:engmech04g [2020/10/25 23:35]
hippysmack [REF: Engine Mechanicals - Sub-04G]
@@ Line 1: / Line 1: @@
 [[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
 ====== 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  ======
@@ Line 82: / Line 95: @@
 All future testing was done with the engine up to operating temperature with oil temp at 200°F. \\
-====== Initial Test (engine at operating temp) ======
+===== Initial Test (engine at operating temp) =====
 This is the first official test that was done with the engine up to temp. \\
 Green food coloring in tap water was used as the liquid media. \\
@@ Line 91: / Line 104: @@
 {{:techtalk:ref:engmech:hst_testing_1_at_3000_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_1_at_4000_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_1_at_5000_rpm_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=79)) \\
-====== Test after replacing the umbrellas ======
+===== Test after replacing the umbrellas =====
 Upon removal of the old umbrellas, the rear one was a little stiffer than the front but still would bend over (just not as much as the front would). \\
 The front was just as flimsy as a new one. \\
@@ Line 108: / Line 121: @@
 {{:techtalk:ref:engmech:hst_testing_2_at_3000_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_4000_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_5000_rpm_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=82))
-====== Test with reduced breather bolt orifices ======
+===== Test with reduced breather bolt orifices =====
 This was done to see what the affects were of the restricted breather bolts in 04-up engines. \\
 (to see if the restricted hole itself has an affect on pressure on the inside and if so how much) \\
@@ Line 120: / Line 134: @@
 {{: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: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)) \\
@@ Line 125: / Line 141: @@
 {{: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))  \\
 \\

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