Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
techtalk:ref:engmech05 [2020/10/07 21:42] hippysmack |
techtalk:ref:engmech05 [2023/12/21 16:38] (current) hippysmack [OEM Breathe Bolts] |
||
|---|---|---|---|
| Line 21: | Line 21: | ||
| * [[techtalk:ref:engmech05i|79-85 Breather Vent Mod - Adding a Secondary Vent Hose at 6:00 Position]] | * [[techtalk:ref:engmech05i|79-85 Breather Vent Mod - Adding a Secondary Vent Hose at 6:00 Position]] | ||
| * [[techtalk:ref:engmech05j|Aftermarket Breather Valves]] | * [[techtalk:ref:engmech05j|Aftermarket Breather Valves]] | ||
| + | * [[techtalk:ref:engmech05k|Installing "Slobber Stoppers" (1991-1993 Models)]] | ||
| * **Related articles in the Sportsterpedia**. | * **Related articles in the Sportsterpedia**. | ||
| * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) | * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) | ||
| Line 32: | Line 33: | ||
| **Maintaining your OEM breather umbrella valve(s) is not something you do every five years or so**. \\ | **Maintaining your OEM breather umbrella valve(s) is not something you do every five years or so**. \\ | ||
| - | Harley considers them a normal replacement item. ((XLXR of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516)) \\ | + | Harley considers them a normal replacement item. ((XLXR of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question?t=1946516)) \\ |
| The biggest problem occurs when the stock umbrella valves blow out or get hard and quit working as one way valves. \\ | The biggest problem occurs when the stock umbrella valves blow out or get hard and quit working as one way valves. \\ | ||
| The purpose of one way valves is to allow the air in the crank case to be pushed out as the pistons go down. \\ | The purpose of one way valves is to allow the air in the crank case to be pushed out as the pistons go down. \\ | ||
| Line 40: | Line 41: | ||
| **General statements on modifications of OEM components**: \\ | **General statements on modifications of OEM components**: \\ | ||
| If you're discussing engine breathing mods, you're also discussing changing crankcase pressure. \\ | If you're discussing engine breathing mods, you're also discussing changing crankcase pressure. \\ | ||
| - | Revised crankcase breathing is an area where you have huge potential to create unintended consequences. ((maru of theXLFORUM http://xlforum.net/forums/showthread.php?t=75740&highlight=reed+valve&page=6)) \\ | + | Revised crankcase breathing is an area where you have huge potential to create unintended consequences. ((maru of theXLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/38153-xr750-883-series-race-engine-venting-etc/page6?t=75740&highlight=reed+valve&page=6)) \\ |
| Few really understand the ifs, ands and buts of all the factors the factory took into consideration when they designed the system. \\ | Few really understand the ifs, ands and buts of all the factors the factory took into consideration when they designed the system. \\ | ||
| The MoCo somehow balanced the engine design factors to come up with a compromise that worked. \\ | The MoCo somehow balanced the engine design factors to come up with a compromise that worked. \\ | ||
| Line 80: | Line 81: | ||
| * OUR breather valve ads X amount of horsepower to your engine. \\ The reality is there is no data from aftermarket breathers manufacturers showing any horsepower gains from testing done on their breather valves. | * OUR breather valve ads X amount of horsepower to your engine. \\ The reality is there is no data from aftermarket breathers manufacturers showing any horsepower gains from testing done on their breather valves. | ||
| * Hayden makes that claim, maybe others also, but they offer no evidence as to how their valve adds horsepower. | * Hayden makes that claim, maybe others also, but they offer no evidence as to how their valve adds horsepower. | ||
| - | * Testing was done however to prove whether any breather vent in particular could make extra horsepower. \\ See comments by aswracing below on venting mods to obtain more horsepower: ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=75740&highlight=reed+valve&page=6)) | + | * Testing was done however to prove whether any breather vent in particular could make extra horsepower. \\ See comments by aswracing below on venting mods to obtain more horsepower: ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/38153-xr750-883-series-race-engine-venting-etc/page6?t=75740&highlight=reed+valve&page=6)) |
| - | * I've induced scavenging issues mostly from using gapless rings. But not from venting mods. \\ However, I've dyno tested venting mods until I'm blue in the face and never found a single horsepower there. \\ (except for pulling the blow by out of the intake tract, which is good for a small across the board improvement) \\ S&S cases have no scavenging issues due to the strategic placement of the reed valve (in the sump). \\ The scavenge inlet sees pressure but is isolated from the vacuum when the pistons go back up. \\ In addition to the above, I also did a bunch of testing of the aftermarket breather check valves from Spyke and Hayden. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4)) \\ (and even did some experiments with vacuum pumps and the like) Did some magazine articles here and there at the time. \\ The motor was remarkably insensitive to anything I did with the breathers. \\ Like I said, the only thing I could get to show up on the Dyno sheet at all was the removing of the blow-by from the intake tract. | + | * I've induced scavenging issues mostly from using gapless rings. But not from venting mods. \\ However, I've dyno tested venting mods until I'm blue in the face and never found a single horsepower there. \\ (except for pulling the blow by out of the intake tract, which is good for a small across the board improvement) \\ S&S cases have no scavenging issues due to the strategic placement of the reed valve (in the sump). \\ The scavenge inlet sees pressure but is isolated from the vacuum when the pistons go back up. \\ In addition to the above, I also did a bunch of testing of the aftermarket breather check valves from Spyke and Hayden. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4)) \\ (and even did some experiments with vacuum pumps and the like) Did some magazine articles here and there at the time. \\ The motor was remarkably insensitive to anything I did with the breathers. \\ Like I said, the only thing I could get to show up on the Dyno sheet at all was the removing of the blow-by from the intake tract. |
| - **Stage 1 or higher air cleaner changes makes OEM breather venting impossible**. | - **Stage 1 or higher air cleaner changes makes OEM breather venting impossible**. | ||
| * It is still possible to keep the venting into the air cleaner when upgrading OEM air cleaners. \\ You may have to get creative with plumbing or fabrication in some instances however. | * It is still possible to keep the venting into the air cleaner when upgrading OEM air cleaners. \\ You may have to get creative with plumbing or fabrication in some instances however. | ||
| * You may also want to take advantage of some of the mods listed in the sub documents at the top of this page. \\ Again changing the breathing system can have it's downfalls and should only be done to improve the breathing system. \\ Testing the internal air pressure after performing breather mods will tell you if the mods helped or hurt the system. | * You may also want to take advantage of some of the mods listed in the sub documents at the top of this page. \\ Again changing the breathing system can have it's downfalls and should only be done to improve the breathing system. \\ Testing the internal air pressure after performing breather mods will tell you if the mods helped or hurt the system. | ||
| - | |||
| - | |||
| - | |||
| ====== Vent Outlet Above vs Below the Head Vents ====== | ====== Vent Outlet Above vs Below the Head Vents ====== | ||
| - | |||
| There has been debatable ways to route the vent lines off the heads when doing air cleaner mods. \\ | There has been debatable ways to route the vent lines off the heads when doing air cleaner mods. \\ | ||
| However, exact line routing comes down to function over fashion. \\ | However, exact line routing comes down to function over fashion. \\ | ||
| Line 121: | Line 118: | ||
| Vent lines mounted high tend to promote a mixture of oil and condensation settling near the head connection of the hose. \\ | Vent lines mounted high tend to promote a mixture of oil and condensation settling near the head connection of the hose. \\ | ||
| - | {{techtalk:ref:engmech:kuryakyn_breather_bolts_1_by_scar55.jpg?direct&300|}} ((photo by Scar55 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1690623)) {{techtalk:ref:engmech:kuryakyn_breather_bolts_2_by_scar55.jpg?direct&300|}} ((photo by Scar55 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1690623)) | + | {{techtalk:ref:engmech:kuryakyn_breather_bolts_1_by_scar55.jpg?direct&300|}} ((photo by Scar55 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/157991-ooozzz-running-out-of-my-crank-case-breather-hose?t=1690623)) {{techtalk:ref:engmech:kuryakyn_breather_bolts_2_by_scar55.jpg?direct&300|}} ((photo by Scar55 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/157991-ooozzz-running-out-of-my-crank-case-breather-hose?t=1690623)) |
| **Horseshoe Tube**: \\ | **Horseshoe Tube**: \\ | ||
| - | The horseshoe breathers that take the outlet from the breather bolts upwards tend to clog with foamy oily gunk. ((FoxsterUK of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=544771)) \\ | + | The horseshoe breathers that take the outlet from the breather bolts upwards tend to clog with foamy oily gunk. ((FoxsterUK of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/76554-crankcase-breather-horseshoe-leak?threadid=544771)) \\ |
| It's a low pressure output with not enough to push the sludge upwards and around the bend. \\ | It's a low pressure output with not enough to push the sludge upwards and around the bend. \\ | ||
| This means the breather bolts are swimming in this gunk and if there is a small leak there is plenty to leak. \\ | This means the breather bolts are swimming in this gunk and if there is a small leak there is plenty to leak. \\ | ||
| Line 141: | Line 138: | ||
| {{:techtalk:ref:engmech:horseshoe_breather_tube_mounted_high_1_by_hippysmack.jpg?direct&400|}} ((drawing by Hippysmack)) {{:techtalk:ref:engmech:horseshoe_breather_tube_mounted_high_2_by_hippysmack.jpg?direct&400|}} ((drawing by Hippysmack)) \\ | {{:techtalk:ref:engmech:horseshoe_breather_tube_mounted_high_1_by_hippysmack.jpg?direct&400|}} ((drawing by Hippysmack)) {{:techtalk:ref:engmech:horseshoe_breather_tube_mounted_high_2_by_hippysmack.jpg?direct&400|}} ((drawing by Hippysmack)) \\ | ||
| - | |Horseshoe tube, high mount / vent line in front. ((photo by OakBehringer of the XLFORUM http://xlforum.net/forums/showthread.php?t=2004878))|Rear bolt covered in sludge. ((photo by OakBehringer of the XLFORUM http://xlforum.net/forums/showthread.php?t=2004878))|Filter mounted high will receive built up sludge. ((photo by AustinXL of the XLFORUM http://xlforum.net/forums/showthread.php?t=1507294))| | + | |Horseshoe tube, high mount / vent line in front. ((photo by OakBehringer of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/187981-horseshoe-breathers-do-they-suck-a-cautionary-post?t=2004878))|Rear bolt covered in sludge. ((photo by OakBehringer of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/187981-horseshoe-breathers-do-they-suck-a-cautionary-post?t=2004878))|Filter mounted high will receive built up sludge. ((photo by AustinXL of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-buell-motorcycle-forum-general-discussion/dealers-stealers-indys-and-parts-dealers/138877-dk-customs?t=1507294))| |
| |{{:techtalk:ref:engmech:horseshoe_tube_mounted_high_2_by_oakbehringer.jpg?direct&300|}}|{{:techtalk:ref:engmech:horseshoe_tube_mounted_high_1_by_oakbehringer.jpg?direct&300|}}|{{:techtalk:ref:engmech:horseshoe_breather_mod_up_high_by_austinxl.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:horseshoe_tube_mounted_high_2_by_oakbehringer.jpg?direct&300|}}|{{:techtalk:ref:engmech:horseshoe_tube_mounted_high_1_by_oakbehringer.jpg?direct&300|}}|{{:techtalk:ref:engmech:horseshoe_breather_mod_up_high_by_austinxl.jpg?direct&300|}}| | ||
| Vent lines mounted lower than the head vents allow oil / condensation to leave the heads. \\ | Vent lines mounted lower than the head vents allow oil / condensation to leave the heads. \\ | ||
| - | |This way, sludge can form on each side of filter. ((photo by beuz of the XLFORUM http://xlforum.net/forums/showthread.php?t=11697&page=582))|This way promotes less sludge buildup. ((photo by IXL2Relax of the XLFORUM http://xlforum.net/forums/showthread.php?t=1051311&page=46)) | | + | |This way, sludge can form on each side of filter. ((photo by beuz of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-styles/chopper-bobber-talk/7694-sporty-bobber-pictures/page582?t=11697&page=582))|This way promotes less sludge buildup. ((photo by IXL2Relax of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/111555-air-cleaner-porn/page31?t=1051311&page=46)) | |
| |{{:techtalk:ref:carb:breather_lines_mounted_low_by_beuz.jpg?direct&300|}}|{{:techtalk:ref:carb:breather_lines_mounted_low_by_ixl2relax.jpg?direct&300|}}| | |{{:techtalk:ref:carb:breather_lines_mounted_low_by_beuz.jpg?direct&300|}}|{{:techtalk:ref:carb:breather_lines_mounted_low_by_ixl2relax.jpg?direct&300|}}| | ||
| Line 156: | Line 153: | ||
| ====== Breather Bolts ====== | ====== Breather Bolts ====== | ||
| ===== OEM Breathe Bolts ===== | ===== OEM Breathe Bolts ===== | ||
| - | |||
| Crankcase pressure was increased in 2004 by several means. \\ | Crankcase pressure was increased in 2004 by several means. \\ | ||
| One of which was the reduction of the hole size in the breather bolts on the engine side (more restriction). \\ | One of which was the reduction of the hole size in the breather bolts on the engine side (more restriction). \\ | ||
| - | The smaller hole creates higher pressure in the crankcase on piston downstroke which aides in oil scavenging. \\ | + | The smaller hole creates higher (positive) pressure in the crankcase on piston downstroke which aides in oil scavenging. \\ |
| - | They also allow the air to leave the vents at a faster rate. \\ | + | They also allow the air to leave the vents at a faster (pressure) rate. \\ |
| The threads in these bolts are cut wider for a tighter fit into the heads. \\ | The threads in these bolts are cut wider for a tighter fit into the heads. \\ | ||
| - | {{:techtalk:evo:carb:91-03_breather_bolts_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) | + | {{:techtalk:evo:carb:91-03_breather_bolts_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/28874-stock-air-cleaner-box-modifications/page20#post4310316)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/28874-stock-air-cleaner-box-modifications/page20#post4310316)) |
| ===== Aftermarket Banjo Bolts ===== | ===== Aftermarket Banjo Bolts ===== | ||
| - | |||
| Aftermarket breather bolts have a larger hole in the bolts than the 04+ bolts. \\ | Aftermarket breather bolts have a larger hole in the bolts than the 04+ bolts. \\ | ||
| - | The banjo bolt must be indexed to have the small side hole on top. ((rejeanprimeau of the XLFORUM http://xlforum.net/forums/showthread.php?t=2004878&page=2)) \\ | + | The banjo bolt must be indexed to have the small side hole on top. ((rejeanprimeau of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/187981-horseshoe-breathers-do-they-suck-a-cautionary-post/page2?t=2004878&page=2)) \\ |
| If not, they will drip more. You can adjust them with copper washers. \\ | If not, they will drip more. You can adjust them with copper washers. \\ | ||
| Line 177: | Line 172: | ||
| On 04-up heads, changing to aftermarket breather bolts means using bolts with the bigger I.D. (91-03) style bolts. \\ | On 04-up heads, changing to aftermarket breather bolts means using bolts with the bigger I.D. (91-03) style bolts. \\ | ||
| - | The results of using the bigger holed bolt would be a slower rate of outflow and less positive crankcase pressure on a stock motor. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=4)) \\ | + | The results of using the bigger holed bolt would be a slower rate of outflow and less positive crankcase pressure on a stock motor. ((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/page4?t=2073932&page=4)) \\ |
| But the timing of the upstroke is the same which then pulls a vacuum. \\ | But the timing of the upstroke is the same which then pulls a vacuum. \\ | ||
| The umbrella valve will close down only when inside air pressure is lower than outside air pressure. \\ | The umbrella valve will close down only when inside air pressure is lower than outside air pressure. \\ | ||
| Line 190: | Line 185: | ||
| This may be something you'd want to watch since there isn't sufficient data to prove one way or the other. \\ | This may be something you'd want to watch since there isn't sufficient data to prove one way or the other. \\ | ||
| - | {{:techtalk:ref:engmech:breather_mod_2_by_hagen.jpg?direct&300|}} ((photo by Hagen of the XLFORUM http://xlforum.net/forums/showthread.php?t=146084&page=11)) {{:techtalk:ref:engmech:ds_breather_bolt_by_hagen.png?direct&300|}} ((photo by Hagen of theXLFORIM http://xlforum.net/forums/showthread.php?t=692845)) {{:techtalk:ref:engmech:broken_banjo_bolt_by_scout99.jpg?direct&200|}} ((photo by Scout99 of the XLFORUM http://xlforum.net/forums/showthread.php?t=28299)) | + | {{:techtalk:ref:engmech:breather_mod_2_by_hagen.jpg?direct&300|}} ((photo by Hagen of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/44522-show-me-your-non-stock-breather-systems/page11?t=146084&page=11)) {{:techtalk:ref:engmech:ds_breather_bolt_by_hagen.png?direct&300|}} ((photo by Hagen of theXLFORIM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/87720-need-some-help-installing-my-breather-bolts?t=692845)) {{:techtalk:ref:engmech:broken_banjo_bolt_by_scout99.jpg?direct&200|}} ((photo by Scout99 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/16986-broken-carb-mounting-bracket?t=28299)) |
| ====== Filter on End of the Vent Line ====== | ====== Filter on End of the Vent Line ====== | ||
| Line 199: | Line 194: | ||
| A stopped up filter can also increase the vacuum inside the engine, which on a street bike, translates to weeping gaskets. \\ | A stopped up filter can also increase the vacuum inside the engine, which on a street bike, translates to weeping gaskets. \\ | ||
| - | The filter does not keep debris from coming back into the engine. ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=2087347)) That's the job of the breather valves inside the engine. \\ | + | The filter does not keep debris from coming back into the engine. ((Folkie of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/78453-crankcase-breather-aka-stupid/page2#post1632160)) That's the job of the breather valves inside the engine. \\ |
| If anything can get back in, it means your umbrella valves are shot. \\ | If anything can get back in, it means your umbrella valves are shot. \\ | ||
| There will be quite a bit of oil coming out the breathers, and all sorts of stuff going back in. \\ | There will be quite a bit of oil coming out the breathers, and all sorts of stuff going back in. \\ | ||
| Line 222: | Line 217: | ||
| ===== Filter Placement / Maintenance ===== | ===== Filter Placement / Maintenance ===== | ||
| - | |||
| Adding a filter on the end of the line and hanging the filter lower than the vent can cause filter blockage. \\ | Adding a filter on the end of the line and hanging the filter lower than the vent can cause filter blockage. \\ | ||
| No matter what breathing system you are using, a certain amount of oil / air mist still makes it past the breather. \\ | No matter what breathing system you are using, a certain amount of oil / air mist still makes it past the breather. \\ | ||
| Line 238: | Line 232: | ||
| The filter in the first pic below was full of junk contributing to weeping rocker box gaskets. \\ | The filter in the first pic below was full of junk contributing to weeping rocker box gaskets. \\ | ||
| - | {{:techtalk:ref:engmech:clogged_breather_filter_by_60gunner.jpg?direct&300|}} ((photo by 60Gunner of the XLFORUM http://xlforum.net/forums/showthread.php?t=2074059&page=5)) {{:techtalk:ref:engmech:05_breather_mod_2_by_socal1200R_annotated_by_hippysmack.jpg?direct&300|}} ((photo by socal1200r of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=30844)) | + | {{:techtalk:ref:engmech:clogged_breather_filter_by_60gunner.jpg?direct&300|}} ((photo by 60Gunner of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/197429-wtf-is-it-with-these-f-n-rocker-cover-leaks/page5?t=2074059&page=5)) {{:techtalk:ref:engmech:05_breather_mod_2_by_socal1200R_annotated_by_hippysmack.jpg?direct&300|}} ((photo by socal1200r of the XLFORUM, annotated by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/18515-ram-flo-horseshoe-breather-option?t=30844)) |
| ====== Homemade Breather Valves ====== | ====== Homemade Breather Valves ====== | ||
| - | This was made by norseXL of the XLFORUM and is a direct derivative of the 86-90 breather valve setup.((http://xlforum.net/forums/showthread.php?p=5809352#post5809352)) \\ | + | This was made by norseXL of the XLFORUM and is a direct derivative of the 86-90 breather valve setup.((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/36799-installing-the-ultimate-crankcase-vent-%C2%93how-to%C2%94/page23#post4383140)) \\ |
| A male threaded cap was made to screw into the female threaded body of the breather valve container as shown below. \\ | A male threaded cap was made to screw into the female threaded body of the breather valve container as shown below. \\ | ||
| Line 251: | Line 244: | ||
| The umbrella inside the body is the stock 91-03 umbrella. \\ | The umbrella inside the body is the stock 91-03 umbrella. \\ | ||
| A 1.5mm hole was drilled into the bottom side of the body to drain any oil that makes it past the umbrella. \\ | A 1.5mm hole was drilled into the bottom side of the body to drain any oil that makes it past the umbrella. \\ | ||
| - | |||
| {{:techtalk:ref:engmech:homemade_breather_vavle_1_by_norsexl.jpg?direct&300|}} {{:techtalk:ref:engmech:homemade_breather_vavle_3_by_norsexl.jpg?direct&300|}} \\ | {{:techtalk:ref:engmech:homemade_breather_vavle_1_by_norsexl.jpg?direct&300|}} {{:techtalk:ref:engmech:homemade_breather_vavle_3_by_norsexl.jpg?direct&300|}} \\ | ||
