Differences
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| - | Both sides previous revisionPrevious revision |
| - | techtalk:ref:genmsr04 [2020/10/30 00:30] – [Modified Oil Tank Cap] hippysmack |
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| + | techtalk:ref:genmsr04 [2023/12/26 22:52] (current) – hippysmack |
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| \\ | |
| ====== Using / Diagnosing with a Slack Tube (Manometer) ====== | |
| See also in the Sportsterpedia: | |
| @@ Line -19,5 +18,4 @@ | |
| ==== Valve vs No Valve on Source Outlet ==== | |
| 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. \\ | |
| @@ Line -36,5 +34,4 @@ | |
| ==== Timing Hole Plug (57-03) ==== | |
| * 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. | |
| @@ Line -42,12 +39,11 @@ | |
| | **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 | |
| |{{: | |
| | Fitting installed (just snugged up) with clear hose and a homemade manometer. ((photos by Hippysmack of the XLFORUM | |
| |{{: | |
| ==== Oil Tank / Vent Line ==== | |
| **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. \\ | |
| @@ Line -68,10 +64,9 @@ | |
| 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. \\ | |
| |Slack Tube testing from timing hole plug. ((photos by bustert of the XLFORUM | |
| |1000 \\ RPM|{{: | |
| |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: | |
| @@ Line -81,4 +76,5 @@ | |
| 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 ====== | |
| @@ Line -92,6 +88,4 @@ | |
| * Convert metric measurements to inches if needed. | |
| * The result is expressed as the pressure in Inches of Water Column. | |
| At idle gives the most vacuum in the crankcase you'll have throughout the RPM range. \\ | |
| @@ Line -115,5 +109,4 @@ | |
| ====== Conversion Chart ====== | |
| Conversion Results Rounded: \\ | |
| Click here {{: | |
| @@ Line -128,9 +121,6 @@ | |
| |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| | |
| ====== Calculating Between PSI and Inches of Water ====== | |
| 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. \\ | |
| @@ Line -150,5 +140,4 @@ | |
| ====== Inches of Water to Inches of Mercury (Hg) ====== | |
| 1" of water column = 0.073555905223332" | |
| ====== Calculating Pascal Units ====== | |
| @@ Line -224,6 +213,4 @@ | |
| Zero Absolute Pressure. \\ | |
| The complete absence of any gas; a perfect vacuum. | |
| \\ | |
