Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
techtalk:ref:engmech05 [2020/10/06 22:00] hippysmack [Aftermarket engine breathers and breathing mods in general] |
techtalk:ref:engmech05 [2020/10/07 21:42] hippysmack |
||
|---|---|---|---|
| Line 240: | Line 240: | ||
| {{: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 ====== | ||
