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techtalk:ref:tools173 [2020/10/25 22:39] hippysmack [How tall should the U-tube be?] |
techtalk:ref:tools173 [2024/01/24 23:12] hippysmack |
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* [[techtalk:ref:genmsr04#using_diagnosing_with_a_slack_tube_manometer|Using / Diagnosing with a Slack Tube (Manometer)]] | * [[techtalk:ref:genmsr04#using_diagnosing_with_a_slack_tube_manometer|Using / Diagnosing with a Slack Tube (Manometer)]] | ||
* [[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]] | ||
A manometer is used to measure the pressure difference between two gases, often atmosphere and the gas being tested. ((https://sciencing.com/perform-manometer-test-7644846.html)) \\ | A manometer is used to measure the pressure difference between two gases, often atmosphere and the gas being tested. ((https://sciencing.com/perform-manometer-test-7644846.html)) \\ | ||
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===== What is it used for? ===== | ===== What is it used for? ===== | ||
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There are many purposes for a manometer in diagnosing Motorcycle issues; \\ | There are many purposes for a manometer in diagnosing Motorcycle issues; \\ | ||
* A manometer has long been a tool to help in synchronizing the vacuum between multi-carb engines. \\ With a Sportster having only the one carb, the meter can still be used to measure how much vacuum is present in the venture. | * A manometer has long been a tool to help in synchronizing the vacuum between multi-carb engines. \\ With a Sportster having only the one carb, the meter can still be used to measure how much vacuum is present in the venture. | ||
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===== Where to get one ===== | ===== Where to get one ===== | ||
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A simple U-tube manometer can be homemade or bought commercially. \\ | A simple U-tube manometer can be homemade or bought commercially. \\ | ||
Dwyer is a popular brand and these can also be purchased used (Ebay) at a lower price. \\ | Dwyer is a popular brand and these can also be purchased used (Ebay) at a lower price. \\ | ||
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Many folks strip out the valves and drain the tubes when they are not using them. \\ | Many folks strip out the valves and drain the tubes when they are not using them. \\ | ||
The difference in elevation between the two liquid levels is the draft. \\ | The difference in elevation between the two liquid levels is the draft. \\ | ||
- | |This is the Dwyer manometer.((photo by bustert of the XLFORUM http://xlforum.net/forums/showthread.php?p=5767694#post5767694))|Homemade version using a ruler as a scale. ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790))| | + | |This is the Dwyer manometer.((photo 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))|Homemade version using a ruler as a scale. ((photo 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:checking_cc_pressure_at_timing_hole_plug_5_by_bustert.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_5_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:checking_cc_pressure_at_timing_hole_plug_5_by_bustert.jpg?direct&300|}}| {{:techtalk:ref:engmech:homemade_slack_tube_5_by_hippysmack.jpg?direct&300|}}| | ||
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The levels of the fluid in the two vertical columns should be equal at this point, as they are currently exposed to the same pressure. \\ | The levels of the fluid in the two vertical columns should be equal at this point, as they are currently exposed to the same pressure. \\ | ||
This level is therefore marked and identified as the zero reference point of the manometer. \\ | This level is therefore marked and identified as the zero reference point of the manometer. \\ | ||
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===== How does it work? ===== | ===== How does it work? ===== | ||
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With the U-tube design, one long tube is mounted vertically on a stand, curved at the bottom center which creates two 'legs' vertically positioned. \\ | With the U-tube design, one long tube is mounted vertically on a stand, curved at the bottom center which creates two 'legs' vertically positioned. \\ | ||
This leaves both ends open to atmosphere with the air above the water level having equal pressure in both legs. \\ | This leaves both ends open to atmosphere with the air above the water level having equal pressure in both legs. \\ |