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| techtalk:ref:genmsr04 [2020/10/27 04:35] – [Timing Hole Plug (57-03)] hippysmack | techtalk:ref:genmsr04 [2023/12/26 22:52] (current) – hippysmack | ||
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| - | ====== REF: Engine Mechanicals | + | ====== REF: General-MSR 04 ====== |
| \\ | \\ | ||
| ====== 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: | * [[techtalk: | ||
| * [[techtalk: | * [[techtalk: | ||
| + | * [[techtalk: | ||
| * [[techtalk: | * [[techtalk: | ||
| * [[techtalk: | * [[techtalk: | ||
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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 | + | |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 | + | | Fitting installed (just snugged up) with clear hose and a homemade manometer. ((photos by Hippysmack of the XLFORUM |
| |{{: | |{{: | ||
| ==== 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 | + | |Slack Tube testing from timing hole plug. ((photos by bustert of the XLFORUM |
| |1000 \\ RPM|{{: | |1000 \\ RPM|{{: | ||
| |6000 \\ 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: | ||
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| + | {{: | ||
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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 {{: | Click here {{: | ||
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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" | 1" of water column = 0.073555905223332" | ||
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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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