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techtalk:ref:genmsr04 [2020/10/26 17:36] hippysmack [Valve vs No Valve on Source Outlet] |
techtalk:ref:genmsr04 [2023/12/26 22:52] hippysmack |
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[[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
- | ====== REF: Engine Mechanicals - Sub-04F ====== | + | ====== REF: General-MSR 04 ====== |
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====== Using / Diagnosing with a Slack Tube (Manometer) ====== | ====== Using / Diagnosing with a Slack Tube (Manometer) ====== | ||
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See also in the Sportsterpedia: \\ | See also in the Sportsterpedia: \\ | ||
* [[techtalk:ref:tools173#manometer_slack_tube_for_measuring_air_pressure|Manometer (slack tube) for Measuring Air Pressure]] (what it is and how it works) | * [[techtalk:ref:tools173#manometer_slack_tube_for_measuring_air_pressure|Manometer (slack tube) for Measuring Air Pressure]] (what it is and how it works) | ||
* [[techtalk:ref:engmech04e|Building Your Own Slack Tube]] | * [[techtalk:ref:engmech04e|Building Your Own Slack Tube]] | ||
+ | * [[techtalk:ref:genmsr04a|Modifying a Rubber Stopper for Oil Tank Pressure Testing]] | ||
* [[techtalk:ref:engmech04g|Slack Tube Testing on a 1998 1250S Sportster]] | * [[techtalk:ref:engmech04g|Slack Tube Testing on a 1998 1250S Sportster]] | ||
* [[techtalk:ref:engmech07p|Testing with a Slack Tube (Manometer) by bustert]] | * [[techtalk:ref:engmech07p|Testing with a Slack Tube (Manometer) by bustert]] | ||
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==== Valve vs No Valve on Source Outlet ==== | ==== Valve vs No Valve on Source Outlet ==== | ||
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A valve is sometimes used on the source outlet to connect the test line to the manometer. \\ | A valve is sometimes used on the source outlet to connect the test line to the manometer. \\ | ||
This is a safety precaution in case more vacuum is being pulled than the manometer is calibrated for. \\ | This is a safety precaution in case more vacuum is being pulled than the manometer is calibrated for. \\ | ||
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==== Timing Hole Plug (57-03) ==== | ==== Timing Hole Plug (57-03) ==== | ||
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* This method won't work on 04-up models as they have no timing hole plug. \\ Basically you need some clear vinyl hose and a nipple fitting to replace the timing hole plug. | * This method won't work on 04-up models as they have no timing hole plug. \\ Basically you need some clear vinyl hose and a nipple fitting to replace the timing hole plug. | ||
* 1957-2003 engines have a timing plug hole that can be removed and a couple fittings with a hose barb end can be installed to accept the hose. | * 1957-2003 engines have a timing plug hole that can be removed and a couple fittings with a hose barb end can be installed to accept the hose. | ||
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| **Timing hole plug fittings** ||| | | **Timing hole plug fittings** ||| | ||
- | |3/8" flare to 1/4" FPT fitting \\ with a 1/4" MPT to 3/8" hose barb. ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))|3/8" NPT x 1/4" NPT bushing and a 1/4" NPT to 1/8" hose barb fiting. ((photos by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790))|| | + | |3/8" flare to 1/4" FPT fitting \\ with a 1/4" MPT to 3/8" hose barb. ((photo by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))|3/8" NPT x 1/4" NPT bushing and a 1/4" NPT to 3/16" hose barb fiting. ((photos by Hippysmack of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/197307-sportster-crankcase-pressure-engine-breathing-wetsumping-and-mods/page52#post4349847))|| |
- | |{{:techtalk:ref:engmech:timing_plug_adapter_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:genmsr:timing_hole_fitting_for_slack_tube.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_1_by_hippysmack.jpg?direct&300|}}| | + | |{{:techtalk:ref:engmech:timing_plug_adapter_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:genmsr:timing_hole_fitting_for_slack_tube_by_hippysmack.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_1_by_hippysmack.jpg?direct&300|}}| |
- | | Fitting installed (just snugged up) with clear hose and a homemade manometer. ((photos by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790)) ||| | + | | Fitting installed (just snugged up) with clear hose and a homemade manometer. ((photos by Hippysmack of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/197307-sportster-crankcase-pressure-engine-breathing-wetsumping-and-mods/page52#post4349847)) ||| |
|{{:techtalk:ref:engmech:homemade_slack_tube_7_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:homemade_slack_tube_8_by_hippysmack.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_5_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:homemade_slack_tube_7_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:homemade_slack_tube_8_by_hippysmack.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_5_by_hippysmack.jpg?direct&300|}}| | ||
==== Oil Tank / Vent Line ==== | ==== Oil Tank / Vent Line ==== | ||
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**You can test crankcase pressure from the tank vent** as it will show the amount of vacuum that is being created between the cam chest and the oil tank. \\ | **You can test crankcase pressure from the tank vent** as it will show the amount of vacuum that is being created between the cam chest and the oil tank. \\ | ||
This measurement (when tested on a 2001 XL1200S) was lower than when the same engine was tested from the crankcase. \\ | This measurement (when tested on a 2001 XL1200S) was lower than when the same engine was tested from the crankcase. \\ | ||
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The crankcase was tested from the timing plug and the oil tank was tested with a modded spare oil cap. \\ | The crankcase was tested from the timing plug and the oil tank was tested with a modded spare oil cap. \\ | ||
So the pics on the right represent actual working pressure in the tank. \\ | So the pics on the right represent actual working pressure in the tank. \\ | ||
- | |Slack Tube testing from timing hole plug. ((photos by bustert of the XLFORUM http://xlforum.net/forums/showthread.php?p=5767694#post5767694))||Slack Tube testing from oil tank|| | + | |Slack Tube testing from timing hole plug. ((photos by bustert of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/197307-sportster-crankcase-pressure-engine-breathing-wetsumping-and-mods/page31#post4326111))||Slack Tube testing from oil tank|| |
|1000 \\ RPM|{{:techtalk:ref:engmech:checking_cc_pressure_at_timing_hole_plug_1_by_bustert.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_cc_pressure_at_oil_tank_1.1_by_bustert.jpg?direct&300|}}|1000 \\ RPM| | |1000 \\ RPM|{{:techtalk:ref:engmech:checking_cc_pressure_at_timing_hole_plug_1_by_bustert.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_cc_pressure_at_oil_tank_1.1_by_bustert.jpg?direct&300|}}|1000 \\ RPM| | ||
|6000 \\ RPM|{{:techtalk:ref:engmech:checking_cc_pressure_at_timing_hole_plug_6_by_bustert.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_cc_pressure_at_oil_tank_6_by_bustert.jpg?direct&300|}}|6000 \\ RPM| | |6000 \\ RPM|{{:techtalk:ref:engmech:checking_cc_pressure_at_timing_hole_plug_6_by_bustert.jpg?direct&300|}}|{{:techtalk:ref:engmech:checking_cc_pressure_at_oil_tank_6_by_bustert.jpg?direct&300|}}|6000 \\ RPM| | ||
+ | ==== Modified Oil Tank Cap ==== | ||
+ | You can drill a hole for an NPT fitting in a spare oil cap or make a cap just for testing. \\ | ||
+ | The one below was made from a rubber plug bought at Lowes. [[techtalk:ref:genmsr04a|Click here]] to see the pics of the mod. \\ | ||
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+ | {{:techtalk:ref:genmsr:homemade_test_oil_cap_6_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | ||
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+ | If you're testing the 04-up plastic oil tank for high pressure, the oil cap is not going to be helpful as a test point. \\ | ||
+ | You need a tee installed in the vent line for that. \\ | ||
====== Testing crankcase pressure ====== | ====== Testing crankcase pressure ====== | ||
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* Convert metric measurements to inches if needed. | * Convert metric measurements to inches if needed. | ||
* The result is expressed as the pressure in Inches of Water Column. | * The result is expressed as the pressure in Inches of Water Column. | ||
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At idle gives the most vacuum in the crankcase you'll have throughout the RPM range. \\ | At idle gives the most vacuum in the crankcase you'll have throughout the RPM range. \\ | ||
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====== Conversion Chart ====== | ====== Conversion Chart ====== | ||
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Conversion Results Rounded: \\ | Conversion Results Rounded: \\ | ||
Click here {{:techtalk:ref:engmech:pressure_conversion_chart_by_hippysmack.png?direct&50}} to open a picture of the chart. ((drawing by Hippysmack)) \\ | Click here {{:techtalk:ref:engmech:pressure_conversion_chart_by_hippysmack.png?direct&50}} to open a picture of the chart. ((drawing by Hippysmack)) \\ | ||
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|6|.441|14.95|.217^ |13|.956|32.38|.470^ |20|1.471|49.82|.713^ |27|1.986|67.25|.975^ |34|2.501|84.69|1.228| | |6|.441|14.95|.217^ |13|.956|32.38|.470^ |20|1.471|49.82|.713^ |27|1.986|67.25|.975^ |34|2.501|84.69|1.228| | ||
|7|.515|17.44|.253^ |14|1.03|34.87|.506^ |21|1.545|52.31|.759^ |28|2.060|69.74|1.012^ |35|2.574|87.18|1.264| | |7|.515|17.44|.253^ |14|1.03|34.87|.506^ |21|1.545|52.31|.759^ |28|2.060|69.74|1.012^ |35|2.574|87.18|1.264| | ||
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====== Calculating Between PSI and Inches of Water ====== | ====== Calculating Between PSI and Inches of Water ====== | ||
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The standard conversion from PSI to Inches of Water: 1 PSI is equal to 28" of water column (overall vertical movement). \\ | The standard conversion from PSI to Inches of Water: 1 PSI is equal to 28" of water column (overall vertical movement). \\ | ||
When using a U-tube type manometer, divide the total inches of water travel (in both legs) by 2 as the water in each leg of the instrument are moving. \\ | When using a U-tube type manometer, divide the total inches of water travel (in both legs) by 2 as the water in each leg of the instrument are moving. \\ | ||
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====== Inches of Water to Inches of Mercury (Hg) ====== | ====== Inches of Water to Inches of Mercury (Hg) ====== | ||
1" of water column = 0.073555905223332" in Hg. | 1" of water column = 0.073555905223332" in Hg. | ||
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====== Calculating Pascal Units ====== | ====== Calculating Pascal Units ====== | ||
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Zero Absolute Pressure. \\ | Zero Absolute Pressure. \\ | ||
The complete absence of any gas; a perfect vacuum. | The complete absence of any gas; a perfect vacuum. | ||
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