Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Last revision Both sides next revision | ||
|
techtalk:ref:engmech04e [2020/10/25 23:34] hippysmack [Building Your Own Slack Tube (Manometer)] |
techtalk:ref:engmech04e [2023/12/26 22:47] hippysmack |
||
|---|---|---|---|
| Line 11: | Line 11: | ||
| * [[techtalk:ref:engmech07p|Testing with a Slack Tube (Manometer) by bustert]] | * [[techtalk:ref:engmech07p|Testing with a Slack Tube (Manometer) by bustert]] | ||
| ====== Building the Unit ====== | ====== Building the Unit ====== | ||
| - | Article by Hippysmack of the XLFORUM ((http://xlforum.net/forums/showthread.php?p=5784790#post5784790)) \\ | + | Article 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)) \\ |
| The backing plate is a 2x4 with an aluminum 36" ruler attached with drywall screws. The base is a 12" long piece of 1x6. \\ | The backing plate is a 2x4 with an aluminum 36" ruler attached with drywall screws. The base is a 12" long piece of 1x6. \\ | ||
| Line 17: | Line 17: | ||
| Ambient temps can also shrink or expand the ruler whether wooden or aluminum so that has to be taken into account of subsequent tests. \\ | Ambient temps can also shrink or expand the ruler whether wooden or aluminum so that has to be taken into account of subsequent tests. \\ | ||
| - | {{:techtalk:ref:engmech:homemade_slack_tube_3_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790)) {{:techtalk:ref:tools:checking_ruler_cailbration_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | + | {{:techtalk:ref:engmech:homemade_slack_tube_3_by_hippysmack.jpg?direct&300|}} ((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:tools:checking_ruler_cailbration_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ |
| - | The drywall screws were also used to bind the hose between the ruler and the shank using the screw head to hold the hose down. ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790)) \\ | + | The drywall screws were also used to bind the hose between the ruler and the shank using the screw head to hold the hose down. ((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)) \\ |
| The black connector at the top is a cut down spark plug boot used as a sleeve for the hose connections. \\ | The black connector at the top is a cut down spark plug boot used as a sleeve for the hose connections. \\ | ||
| (technically if you buy enough length of hose, you don't need the connector) \\ | (technically if you buy enough length of hose, you don't need the connector) \\ | ||
| Line 32: | Line 32: | ||
| ===== Selecting the Tubing ===== | ===== Selecting the Tubing ===== | ||
| - | + | The slack tube above is fitted with 1/8" clear Tygon vinyl tubing and a 2x4 app 3 feet long. ((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)) However, any clear vinyl tubing will work (1/4"-1/8"). \\ | |
| - | The slack tube above is fitted with 1/8" clear Tygon vinyl tubing and a 2x4 app 3 feet long. ((photo by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5784790#post5784790)) However, any clear vinyl tubing will work (1/4"-1/8"). \\ | + | |
| You'll need at least twice the length of the tube plus six inches or so for a fudge factor just to fit the tool. \\ | You'll need at least twice the length of the tube plus six inches or so for a fudge factor just to fit the tool. \\ | ||
| If you plan on making the tube a one piece deal, you'll need the tool length plus the length you plan to have it away from the engine. \\ | If you plan on making the tube a one piece deal, you'll need the tool length plus the length you plan to have it away from the engine. \\ | ||
| Line 41: | Line 40: | ||
| The tool should be as close to the engine as possible but exact length isn't a huge issue. \\ | The tool should be as close to the engine as possible but exact length isn't a huge issue. \\ | ||
| The hose from the above tool was fitted with a sleeve (cut portion of a spark plug boot) to connect the tool length of hose to the engine. \\ | The hose from the above tool was fitted with a sleeve (cut portion of a spark plug boot) to connect the tool length of hose to the engine. \\ | ||
| + | |||
| ===== Selecting a liquid media ===== | ===== Selecting a liquid media ===== | ||
| - | |||
| The best liquid to use depends on how much pressure you'll be measuring is the short answer. \\ | The best liquid to use depends on how much pressure you'll be measuring is the short answer. \\ | ||
| Typically, mercury or water is suggested but for use on a Sportster, water is perfectly fine. \\ | Typically, mercury or water is suggested but for use on a Sportster, water is perfectly fine. \\ | ||
| Line 66: | Line 65: | ||
| - The liquid should stick on the walls. | - The liquid should stick on the walls. | ||
| - Should not get vaporized. | - Should not get vaporized. | ||
| - | |||
| ===== How tall should the U-tube be? ===== | ===== How tall should the U-tube be? ===== | ||
| - | |||
| Generally, whichever liquid media you are using, you want the meter to be tall enough so the liquid doesn't suck back into the engine. \\ | Generally, whichever liquid media you are using, you want the meter to be tall enough so the liquid doesn't suck back into the engine. \\ | ||
| The length of the tubes needs to be longer than the expected pressure you'll be measuring. Make sure to account for spikes in considering the tube lengths. \\ | The length of the tubes needs to be longer than the expected pressure you'll be measuring. Make sure to account for spikes in considering the tube lengths. \\ | ||
| Line 108: | Line 105: | ||
| When the bike is in perfect tune, you may get away with a shorter manometer. \\ | When the bike is in perfect tune, you may get away with a shorter manometer. \\ | ||
| But if your bike is well tuned, you really don't need the manometer. \\ | But if your bike is well tuned, you really don't need the manometer. \\ | ||
| - | |||
| - | |||
| - | |||
