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techtalk:ref:engmech04 [2019/12/18 00:49] hippysmack [Breather System Air Volume Test by DK Custom] |
techtalk:ref:engmech04 [2020/09/14 04:23] hippysmack [Breather Valves] |
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| **Cruise** (low load test): Typical RPM most riding takes place in (2500-3000 RPM). \\ | **Cruise** (low load test): Typical RPM most riding takes place in (2500-3000 RPM). \\ | ||
| - | ===== Testing with a Slack Tube by bustert ===== | + | ===== Testing with a Slack Tube (Manometer) by bustert ===== |
| ==== Sub Documents ==== | ==== Sub Documents ==== | ||
| * [[techtalk:ref:engmech04e|Building Your Own Slack Tube]] | * [[techtalk:ref:engmech04e|Building Your Own Slack Tube]] | ||
| - | * [[techtalk:ref:engmech04f|Using / Diagnosing with a Manometer Slack Tube]] | + | * [[techtalk:ref:genmsr04#using_diagnosing_with_a_slack_tube_manometer|Using / Diagnosing with a Slack Tube (Manometer)]] |
| * [[techtalk:ref:engmech04g|Slack tube testing on a 1998 1250S model]] | * [[techtalk:ref:engmech04g|Slack tube testing on a 1998 1250S model]] | ||
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| + | ====== Symptoms of Breather problems ====== | ||
| + | |||
| + | The most noticeable signs of breather valve problems are weeping gaskets or oil excessively leaking out the breather or puking oil out of it. \\ | ||
| + | When the umbrella(s) gets hard, it doesn't flex well to allow the engine to breath out on exhale. \\ | ||
| + | Then the trapped in air is compounded on the next stroke. The excess air contributes to more vacuum created and implodes the gaskets. \\ | ||
| + | Or it contributes to too high of oil density and slings excess oil out. \\ | ||
| + | Other factors are involved so results will vary. \\ | ||
| ===== Why Oil Pukes Out the Air Cleaner ===== | ===== Why Oil Pukes Out the Air Cleaner ===== | ||
| - | Wet sumping is a term usually used when oil spits out the breather vent / air cleaner. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | + | Wet sumping is a term usually used when oil spits out the breather vent / air cleaner. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ |
| - | However, engine breathing and wet sumping are two different ideas. But they are tied together as much as air and water. \\ | + | However, engine breathing and wet sumping are two different ideas. But they are tied together as much as air and water. \\ See [[techtalk:ref:engmech04#wetsumping|Wet Sumping]] below. \\ |
| - | See [[techtalk:ref:engmech04#wetsumping|Wet Sumping]] below. \\ | + | Oil puking and oil seepage out the air cleaner are different conditions. \\ |
| + | You'll know it if it pukes as there will be a good puddle of oil on the shop floor or gobs of oil running rearward of the A/C all over the bike. \\ | ||
| + | Oil seepage (or the oil filter getting saturated with oil over time) may be perfectly normal. \\ | ||
| The real reason these things like to spit oil out the breather is because they're a common crankpin 45° design. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=110375&highlight=variable+volume#post110375)) \\ | The real reason these things like to spit oil out the breather is because they're a common crankpin 45° design. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=110375&highlight=variable+volume#post110375)) \\ | ||
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| So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | So to keep oil out of the A/C, means keeping engine breathing And wet sumping in balance. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5757523#post5757523)) \\ | ||
| + | |||
| ===== Breather Catch Can Test For Oil Leaks Out the Vent ===== | ===== Breather Catch Can Test For Oil Leaks Out the Vent ===== | ||
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| ===== Aftermarket Breathers / PCV Valves ===== | ===== Aftermarket Breathers / PCV Valves ===== | ||
| ==== Sub Documents ==== | ==== Sub Documents ==== | ||
| - | * [[techtalk:ref:engmech04a|Dissecting the Hayden KVP38 Crankcase Breather Valve]] | + | * [[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)) \\ | 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)) \\ | ||
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| * Ball/spring based PCV valve. | * Ball/spring based PCV valve. | ||
| * Makes a clicking noise during operation. | * Makes a clicking noise during operation. | ||
| + | |||
| + | | Here is a 2-stroke reed valve. ((photo by norseXL of the XLFORUM http://xlforum.net/forums/showthread.php?t=1386341&highlight=reed)) | | ||
| + | |{{:techtalk:ref:engmech:reed_valve_by_norsexl.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)) | Reed Valve ((photo by Bluto of the XLFORUM http://xlforum.net/forums/showthread.php?p=5761290#post5761290)) | Doherty Power Vent ((Photo by goblin_dust of the XLFORUM http://xlforum.net/forums/showthread.php?t=72099&highlight=wet+sumping&page=23)) | | | 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)) | Reed Valve ((photo by Bluto of the XLFORUM http://xlforum.net/forums/showthread.php?p=5761290#post5761290)) | Doherty Power Vent ((Photo by goblin_dust of the XLFORUM http://xlforum.net/forums/showthread.php?t=72099&highlight=wet+sumping&page=23)) | | ||
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| * Now add a vacuum pump with Z (-1) amount of pull. \\ Now you get X+1=Y-Z... seems the balance (to zero) is restored even though positive pressure is compiled of blowby. \\ But the lower the negative pressure is at the beginning of the downstroke, the lower the next positive pressure will be. | * Now add a vacuum pump with Z (-1) amount of pull. \\ Now you get X+1=Y-Z... seems the balance (to zero) is restored even though positive pressure is compiled of blowby. \\ But the lower the negative pressure is at the beginning of the downstroke, the lower the next positive pressure will be. | ||
| * If you are generating 2 psi of positive pressure on downstroke but reduce it's beginning surge to -1 psi (Z), \\ the result will be only 1 psi of positive pressure during downstroke. \\ -1 (+) + 2 equals +1. | * If you are generating 2 psi of positive pressure on downstroke but reduce it's beginning surge to -1 psi (Z), \\ the result will be only 1 psi of positive pressure during downstroke. \\ -1 (+) + 2 equals +1. | ||
| + | |||
| + | Another example: | ||
| + | {{:techtalk:ref:engmech:crankcase_pressure_cycle_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
