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| techtalk:ref:engmech05e [2019/07/17 05:29] – [REF: Oiling & Lubrication - Sub-05H] hippysmack | techtalk:ref:engmech05e [2023/12/21 21:23] (current) – [Adding a Vent Between the Oil Tank and the Cam Chest] hippysmack | ||
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| ====== Adding a Vent Between the Oil Tank and the Cam Chest ====== | ====== Adding a Vent Between the Oil Tank and the Cam Chest ====== | ||
| + | Article by Deimus of the XLFORUM ((https:// | ||
| Also see [[techtalk: | Also see [[techtalk: | ||
| **Background**: | **Background**: | ||
| - | This mod was attempted to improve crankcase pressure venting for more efficient oil flow, lower oil temps and neutral pressure inside the oil tank on 04 and up Sportsters. | + | This mod was attempted to improve crankcase pressure venting for more efficient oil flow, lower oil temps and neutral pressure inside the oil tank on 04 and up Sportsters. \\ |
| (even though the vents are different on earlier Sportsters, engine breathing is the same concept) \\ | (even though the vents are different on earlier Sportsters, engine breathing is the same concept) \\ | ||
| - | Before this mod, the tank oil gauge would readily hit 250°F, the oil would look foamy after running hard and the top end was much noisy. | + | Before this mod, the tank oil gauge would readily hit 250°F, the oil would look foamy after running hard and the top end was much noisy. \\ |
| The idea was to install a PCV valve inline on the vent line from the oil tank to the cam chest in addition to the head vents. \\ | The idea was to install a PCV valve inline on the vent line from the oil tank to the cam chest in addition to the head vents. \\ | ||
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| The first thing you will do is to separate the vent hose from the plastic tube section. \\ | The first thing you will do is to separate the vent hose from the plastic tube section. \\ | ||
| - | |Install the tee in the hose with the tee pointing up. ((photo by Deimus of the XLFORUM http:// | + | |Install the tee in the hose with the tee pointing up.|The plastic tube needs to be clipped. \\ The excess piece is sitting on the belt.|Connect the tee with a short piece of 5/16" hose. \\ Connect the tee to the plastic tube.| |
| |{{techtalk: | |{{techtalk: | ||
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| * A wire tie used to secure the loop so it will stay in place. \\ The wire tie is actually connected to a pair of wire ties connected together then attached around the frame tube. \\ Otherwise there' | * A wire tie used to secure the loop so it will stay in place. \\ The wire tie is actually connected to a pair of wire ties connected together then attached around the frame tube. \\ Otherwise there' | ||
| - | | New vent installed and secured. | + | | New vent installed and secured. |
| |{{techtalk: | |{{techtalk: | ||
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| By locating the tee close to the frame tube and trimming the excess from the plastic tube instead of from the original hose. \\ | By locating the tee close to the frame tube and trimming the excess from the plastic tube instead of from the original hose. \\ | ||
| - | | Original finished product. | + | | Original finished product. |
| |{{techtalk: | |{{techtalk: | ||
| - | **First Ride report**: ((Deimus of the XLFORUM | + | **First Ride report**: ((Deimus of the XLFORUM |
| The trip was over 2,200 miles consisting of cool areas, warm areas, and very hot areas as well. \\ | The trip was over 2,200 miles consisting of cool areas, warm areas, and very hot areas as well. \\ | ||
| So all conditions were encountered. The bike ran well the entire time. It never got hot nor foamed the oil. \\ | So all conditions were encountered. The bike ran well the entire time. It never got hot nor foamed the oil. \\ | ||
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| With the added inline fuel filter to strain out the oil vapor from the vented air, no drips were seen in the 100 miles ridden. \\ | With the added inline fuel filter to strain out the oil vapor from the vented air, no drips were seen in the 100 miles ridden. \\ | ||
| - | And with the fuel filter being placed before the PCV valve, the oil should remain in the engine. ((Deimus of the XLFORUM | + | And with the fuel filter being placed before the PCV valve, the oil should remain in the engine. ((Deimus of the XLFORUM |
| |{{techtalk: | |{{techtalk: | ||
| - | **Result**: ((Deimus of the XLFORUM | + | **Result**: ((Deimus of the XLFORUM |
| The paper element in the fuel filter became saturated with oil after 150 miles of riding and the vent hose connections began to leak. \\ | The paper element in the fuel filter became saturated with oil after 150 miles of riding and the vent hose connections began to leak. \\ | ||
| So the paper element filters are not appropriate for this application. \\ | So the paper element filters are not appropriate for this application. \\ | ||
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| Under load, this could sling oil up and then drain down into the vent compartment. \\ | Under load, this could sling oil up and then drain down into the vent compartment. \\ | ||
| - | |Vent location inside the cam cover. | + | |Vent location inside the cam cover.|A screw hole and two drain holes drilled.| |
| |{{techtalk: | |{{techtalk: | ||
| - | + | |An aluminum baffle was fabricated.|Finished baffle shown.| | |
| - | + | ||
| - | |An aluminum baffle was fabricated. | + | |
| |{{techtalk: | |{{techtalk: | ||
| - | + | \\ | |
| **Result**: \\ | **Result**: \\ | ||
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| However, on the interstate at continuous speeds of 80mph, engine temps hit 245°F for the first time since the vent was installed. \\ | However, on the interstate at continuous speeds of 80mph, engine temps hit 245°F for the first time since the vent was installed. \\ | ||
| (presumably caused by the restriction from the in line fuel filter clogged with oil) \\ | (presumably caused by the restriction from the in line fuel filter clogged with oil) \\ | ||
| - | |||
| - | |||
| **Additional changes**: \\ | **Additional changes**: \\ | ||
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| Now the only openings to the vent in the cam cover are the two holes drilled in the bottom of the vent compartment. \\ | Now the only openings to the vent in the cam cover are the two holes drilled in the bottom of the vent compartment. \\ | ||
| - | **Result**: ((Deimus of the XLFORUM | + | **Result**: ((Deimus of the XLFORUM |
| Previously when the inline filter was restricting the air flow, the engine oil temp readily hit 245°F. \\ | Previously when the inline filter was restricting the air flow, the engine oil temp readily hit 245°F. \\ | ||
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| In fact, it increased operating temps and didn't stop the loss of oil. \\ | In fact, it increased operating temps and didn't stop the loss of oil. \\ | ||
| - | Having a check valve is part of the solution. ((Deimus of the XLFORUM | + | Having a check valve is part of the solution. ((Deimus of the XLFORUM |
| Allowing a pulsing of air into and out of the engine can only compound the oil venting problems at best. \\ | Allowing a pulsing of air into and out of the engine can only compound the oil venting problems at best. \\ | ||
| A worse effect is that the presence of that air in the crankcase on the down strokes of the pistons will cost some engine power as these gasses are compressed. \\ | A worse effect is that the presence of that air in the crankcase on the down strokes of the pistons will cost some engine power as these gasses are compressed. \\ | ||
| The engine is working harder with this fix to sustain 80mph than it did to sustain 4000 rpm in 3rd going 60mph. \\ | The engine is working harder with this fix to sustain 80mph than it did to sustain 4000 rpm in 3rd going 60mph. \\ | ||
| - | This should explain the temps in the different situations: ((Deimus of the XLFORUM | + | This should explain the temps in the different situations: ((Deimus of the XLFORUM |
| Running 4000 rpm going 60mph, the temp was 220°F. \\ | Running 4000 rpm going 60mph, the temp was 220°F. \\ | ||
| Running 60mph in 5th gear and the temp was only 200°F. \\ | Running 60mph in 5th gear and the temp was only 200°F. \\ | ||
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| These three examples were all sustained runs of 15 minutes or more in each situation. \\ | These three examples were all sustained runs of 15 minutes or more in each situation. \\ | ||
| - | The location of the factory vent fitting in the cam cover that was used for the " | + | The location of the factory vent fitting in the cam cover that was used for the " |
| The Tee mod worked pretty well except for high speed cruising. \\ | The Tee mod worked pretty well except for high speed cruising. \\ | ||
| So much oil is being slung around that fitting in those conditions that adding a vent there will be oily. \\ | So much oil is being slung around that fitting in those conditions that adding a vent there will be oily. \\ | ||
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