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techtalk:ref:engmech05 [2020/10/06 21:57] hippysmack [Aftermarket engine breathers and breathing mods in general] |
techtalk:ref:engmech05 [2021/07/23 03:55] hippysmack [Sub Documents] |
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| * [[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) | ||
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| * 1977-up engines all use one way breather valves although exact construction and venting changed over the years. \\ 1977-1990 engines all vented from the cam cover. \\ So an external motorcycle one way breather valve (that can be plumbed sufficiently) can be installed externally in the same place. \\ 1977-up engines also all begin making full vacuum starting from when the second piston begins it's upstroke motion. \\ So any external motorcycle one way breather valve (that can be plumbed sufficiently) will work on 1977-up Sportsters. \\ It is important to note that while using an external breather valve, the internal valve should be removed. \\ Leaving the old valve inside will only create more restriction to the air moving out of the engine. | * 1977-up engines all use one way breather valves although exact construction and venting changed over the years. \\ 1977-1990 engines all vented from the cam cover. \\ So an external motorcycle one way breather valve (that can be plumbed sufficiently) can be installed externally in the same place. \\ 1977-up engines also all begin making full vacuum starting from when the second piston begins it's upstroke motion. \\ So any external motorcycle one way breather valve (that can be plumbed sufficiently) will work on 1977-up Sportsters. \\ It is important to note that while using an external breather valve, the internal valve should be removed. \\ Leaving the old valve inside will only create more restriction to the air moving out of the engine. | ||
| - **There is no sensible reason to change air cleaners or engine breathing just because that's someone else did**. | - **There is no sensible reason to change air cleaners or engine breathing just because that's someone else did**. | ||
| - | * If your goal is simply to change the overall appearance, by all means, make it your own. \\ But understand that sometimes you can help or hurt the breathing system by what changes you make and all engines are different. | + | * If your goal is simply to change the overall appearance, by all means, make it your own. \\ But understand that sometimes you can help or hurt the breathing system by what changes you make and all engines are different. \\ You can test the crankcase pressure to find out what your engine is doing or needs so you'll know where to go from there. |
| - **One advantage of venting to atmosphere is cleaner combustion (and cleaner pistons)**. | - **One advantage of venting to atmosphere is cleaner combustion (and cleaner pistons)**. | ||
| * There is also a case against improper installation of external vent(s). \\ There are many aftermarket and homemade breather vent relocation mods available to move the vents out of the air cleaner. \\ However, depending on how you route the vent lines, you can cause emulsified oil accumulation in them. \\ Emulsified oil will just build up in the tubes until it all comes out. And it could also alter engine breathing if it doesn't come out. | * There is also a case against improper installation of external vent(s). \\ There are many aftermarket and homemade breather vent relocation mods available to move the vents out of the air cleaner. \\ However, depending on how you route the vent lines, you can cause emulsified oil accumulation in them. \\ Emulsified oil will just build up in the tubes until it all comes out. And it could also alter engine breathing if it doesn't come out. | ||
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| {{: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 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)) | ||
| - | ====== Aftermarket Breather Valves ====== | ||
| - | |||
| - | ==== Sub Documents ==== | ||
| - | * [[techtalk:ref:engmech04a|Dissecting the Hayden KVP38 Crankcase Breather Valve]] | ||
| - | * [[techtalk:ref:engmech04b|Frequently Asked Questions About the Hayden Krankvent]] | ||
| - | |||
| - | There is a product called a Krankvent that can be plumbed into the lower, 6 o’clock position as an alternative to a stock foo-foo valve. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather)) \\ | ||
| - | But they are not cheap. Automotive PCV valves are not really made to handle the revs or air volumes of a Harley. \\ | ||
| - | While a car engine is bigger, it has one piston coming down while one goes up. \\ | ||
| - | So there's not much change in internal crankcase volume, so not as much breathing to be done. \\ | ||
| - | A Harley has two pistons and rods on one crankpin, so is one giant air compressor. \\ | ||
| - | |||
| - | **Finding a better breather valve**: ((bunny32 of the XLFORUM http://xlforum.net/forums/showthread.php?t=15705&page=2)) \\ | ||
| - | The breather valves that work best on crankcase breathers have several features: \\ | ||
| - | * Low-inertia, i.e. they don't take more than a breath to open and close. | ||
| - | * They operate at low pressures ~1-30psi. | ||
| - | * They preferably have a floating type seal. | ||
| - | * They should be transparent, so you can see if they block up with blowby, solids, bugs etc. | ||
| - | * They should be easy to open and clean occasionally. | ||
| - | * They should push-fit into your breather line. | ||
| - | |||
| - | Metal diaphragm valves with e.g. springs are hopeless. \\ | ||
| - | Also avoid other types of valves designed to work at high pressures e.g. plumbing valves. \\ | ||
| - | Avoid car PCV valves as they are metering as well as non-return valves and are unsuitable. \\ | ||
| - | Automotive PCV valves are designed to let some air back in. \\ | ||
| - | The ball and spring valves will not be able to work fast enough to keep all the air out. \\ | ||
| - | When air is allowed to be drawn back into the engine, it creates a mass that must be compressed by the pistons on downstroke as it is being vented out. \\ | ||
| - | This robs some power and will cause the engine to work harder (creating more internal heat at higher RPM). ((Deimus of the XLFORUM http://xlforum.net/forums/showthread.php?t=67658&page=18)) \\ | ||
| - | |||
| - | Aftermarket Breather Valves for Harley's: \\ | ||
| - | * Sifton Crankcase Breather ((https://www.ebay.com/itm/SIFTON-CASE-BREATHER-VENT-PCV-VALVE-HARLEY-EVO-SHOVELHEAD-PANHEAD-TWINCAM-KRANK/253213372444?epid=1665559744&hash=item3af4b1701c:g:F4cAAOSwzrxUuDhJ)) \\ This appears to be a cheaper version of the Hayden Crankvent also with an umbrella valve installed inside. \\ It is, however, a one time use part as it cannot be taken apart to replace the umbrella valve. | ||
| - | |||
| - | Aftermarket PCV's: ((electronbee of the XLFORUM http://xlforum.net/forums/showthread.php?t=72099&highlight=reed+valve&page=10)) \\ | ||
| - | * Mercedes Benz P/N# 271-018-00-29 ~$13. | ||
| - | * Reed type PCV valve. Fast acting. Used for their C 230 Kompressor engine. | ||
| - | * Dims: 2-1/2" long by 1-1/8" with an I.D of 1/4". | ||
| - | * McCaster Carr P/N# 4610K17 ~$6. | ||
| - | * Umbrella valve. Vacuum check valve. | ||
| - | * Autozone P/N# PCV1174 (PV272) ~$5. | ||
| - | * Ball/spring based PCV valve. | ||
| - | * Makes a clicking noise during operation. | ||
| - | |||
| - | |||
| - | |Hayden KVP38 breather valve, used with the \\ [[techtalk:ref:engmech05d|Deimus Mod]] (cam chest breather conversion). ((photo by 60Gunner of the XLFORUM http://xlforum.net/forums/showthread.php?p=5763918#post5763918))| Hayden breather opened up. ((photos by leucadiaGuit of the XLFORUM http://xlforum.net/forums/showthread.php?t=2004869 cropped by Hippysmack)) || | ||
| - | |{{:techtalk:ref:engmech:deimus_mod_8_by_60gunner.jpg?direct&300|}}|{{:techtalk:ref:engmech:hayden_krankvent_3_by_leucadiaguit_-_cropped.jpg?direct&300|}}|{{:techtalk:ref:engmech:hayden_krankvent_2_by_leucadiaguit_-_cropped.jpg?direct&300|}}| | ||
| - | |||
| - | |Doherty Power Vents with the line routed up then \\ down and attached to the bottom of the frame. ((photo by RIORoosen of the XLFORUM http://xlforum.net/forums/showthread.php?t=146084&page=18))| Doherty Power Vent ((Photo by goblin_dust of the XLFORUM http://xlforum.net/forums/showthread.php?t=72099&highlight=wet+sumping&page=23)) | | ||
| - | |{{:techtalk:ref:engmech:breather_mod_by_rioroosen.jpg?direct&300|}}|{{:techtalk:ref:engmech:deimus_mod_2_by_goblin_dust.jpg?direct&300|}}| | ||
| - | |||
| - | |||
| - | | Here is a 2-stroke reed valve. ((photo by norseXL of the XLFORUM http://xlforum.net/forums/showthread.php?t=1386341&highlight=reed)) | Reed Valve ((photo by Bluto of the XLFORUM http://xlforum.net/forums/showthread.php?p=5761290#post5761290)) | | ||
| - | |{{:techtalk:ref:engmech:reed_valve_by_norsexl.jpg?direct&300|}}|{{:techtalk:ref:engmech:reed_valve_by_bluto.jpg?direct&300|}}| | ||
| - | |||
| - | | Mercedes Benz P/N# 271-018-00-29 ((photo by electronbee of the XLFORUM http://xlforum.net/forums/showthread.php?t=72099&highlight=reed+valve&page=10)) | | ||
| - | |{{:techtalk:ref:engmech:mercedes_benz_pcv_valve_by_electronbee.jpg?direct&300|}}| | ||
| ====== Homemade Breather Valves ====== | ====== Homemade Breather Valves ====== | ||
