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techtalk:ref:engmech04g [2019/11/08 00:23]
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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 |That leaves me with 13-3/​4"​ in the left leg at idle which translates to 27-1/​2"​ of water column. Our readings probably won't match but your instrument would be right for all future readings you take from that tube. My readings are '​right'​ for my tube and it also will be right for my future readings from it. |That leaves me with 13-3/​4"​ in the left leg at idle which translates to 27-1/​2"​ of water column. Our readings probably won't match but your instrument would be right for all future readings you take from that tube. My readings are '​right'​ for my tube and it also will be right for my future readings from it.
  
-====== Testing from cold startup ​======+====== Tests using the head breathing system ====== 
 + 
 +===== Testing from cold startup =====
 An initial test was done at cold startup just to see where the measurements would fall. \\ An initial test was done at cold startup just to see where the measurements would fall. \\
 The engine was warmed just enough to shut the enrichener off and testing began. \\ The engine was warmed just enough to shut the enrichener off and testing began. \\
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 All future testing was done with the engine up to operating temperature with oil temp at 200°F. \\ 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. \\ 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. \\ Green food coloring in tap water was used as the liquid media. \\
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 {{:​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)) \\ {{:​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). \\ 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. \\ The front was just as flimsy as a new one. \\
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 {{:​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)) ​ {{:​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. \\ 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) \\ (to see if the restricted hole itself has an affect on pressure on the inside and if so how much) \\
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 The smaller bolt holes actually reduced vacuum and they also offered more control of crankcase pressure throughout the RPM range by creating lower pressure swings. \\ The smaller bolt holes actually reduced vacuum and they also offered more control of crankcase pressure throughout the RPM range by creating lower pressure swings. \\
 +The air cleaner was left off since it didn't change the crankcase pressure readings. \\ 
 +And it was easier to spot for oil mist from the bolts which there wasn't any. \\
  
 {{:​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_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_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_3-2_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)) ​ \\
  
 \\ \\