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techtalk:ref:carb06 [2019/07/17 23:11] hippysmack [Aftermarket Air Cleaners and Modifications] |
techtalk:ref:carb06 [2019/11/14 03:50] hippysmack [Above vs Below the Head Vents] |
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====== REF: Carburetor, Intake Manifold & Exhaust ====== | ====== REF: Carburetor, Intake Manifold & Exhaust ====== | ||
====== Aftermarket Air Cleaners and Modifications ====== | ====== Aftermarket Air Cleaners and Modifications ====== | ||
+ | \\ | ||
+ | ====== Air Cleaner ====== | ||
+ | ===== Sub Documents ===== | ||
+ | * [[techtalk:ref:carb06a|Homemade Round Air Cleaner Assembly]] | ||
+ | |||
+ | See also [[techtalk:ref:engmech05#breather_vent_relocation|Breather Vent Relocation]] in the REF section of the Sportsterpedia. \\ | ||
+ | |||
Some air cleaners are not set up to allow for the breather bolts into them and are only held on by the small front bolts. ((Shu of the XLFORUM http://xlforum.net/forums/showthread.php?t=146084&page=11)) \\ | Some air cleaners are not set up to allow for the breather bolts into them and are only held on by the small front bolts. ((Shu of the XLFORUM http://xlforum.net/forums/showthread.php?t=146084&page=11)) \\ | ||
For these breathers you would need to get a head breather kit and carb support bracket. \\ | For these breathers you would need to get a head breather kit and carb support bracket. \\ | ||
The breather kit routes the head vents to the ground (or atmosphere) while the carb support bracket keeps the carb in the intake. \\ | The breather kit routes the head vents to the ground (or atmosphere) while the carb support bracket keeps the carb in the intake. \\ | ||
+ | \\ | ||
+ | |||
+ | Below is a breather vent re-direction on an EFI model. ((jcmellis of the XLFORUM http://xlforum.net/forums/showthread.php?t=1179974)) \\ | ||
+ | A small amount of crankcase oil was dripping into the A/C on a Figure Machine/Engineering air cleaner assembly. \\ | ||
+ | This air cleaner uses the stock Harley-Davidson breather tubes. \\ | ||
+ | There was no drip into the stock a/c but using the same breather tubes, it did with the afrtermarket A/C. \\ | ||
+ | This mod doesn't bypass the air cleaner. \\ | ||
+ | It doesn't solve the problem but rather just hides it. \\ | ||
+ | You still have the excess oil but this will arrange for it to run straight into the intake and away from the A/C. \\ | ||
+ | |||
+ | The problem is that the oil vapor needs to make a 180 degree turn, up and over the lip of the kit's bell-mouth, into the throttle body. \\ | ||
+ | A rubber hose would work, except the radius of the curve is too sharp due of the limited space inside the filter. \\ | ||
+ | It'd take some sort of semi-rigid tube. \\ | ||
+ | The Screaming Eagle Stage 1 air cleaner deals with the venting issue using two small preformed rubber tubes or hoses. \\ | ||
+ | The Figure Machine air cleaner utilizes the stock Harley breather hoses (63520-04). \\ | ||
+ | The hoses fit perfectly over the breathers. \\ | ||
+ | The only problem is that about 3/8" needs to be trimmed from both ends to fit the different internal dimensions of the filter/air cleaner. \\ | ||
+ | (The photo above shows the stock part on the left and the trimmed part on the right.) \\ | ||
+ | Once trimmed to size, the hoses are positioned at the mouth of the throttle body. \\ | ||
+ | {{:techtalk:ref:carb:hd_breather_mod_1_by_jcmellis.jpg?direct&300|}} ((photo by jcmellis of the XLFORUM http://xlforum.net/forums/showthread.php?t=1179974)) {{:techtalk:ref:carb:hd_breather_mod_2_by_jcmellis.jpg?direct&300|}} ((photo by jcmellis of the XLFORUM http://xlforum.net/forums/showthread.php?t=1179974)) | ||
====== Running the Breather Hoses (91 and UP) ====== | ====== Running the Breather Hoses (91 and UP) ====== | ||
===== How the umbrella ( head breather) valves work ===== | ===== How the umbrella ( head breather) valves work ===== | ||
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The oil would have to run uphill to get from the heads to the rocker boxes and into the lower end. \\ | The oil would have to run uphill to get from the heads to the rocker boxes and into the lower end. \\ | ||
So there is no functional advantage to running the lines higher than the head vents. \\ | So there is no functional advantage to running the lines higher than the head vents. \\ | ||
- | {{:techtalk:evo:engmech:91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | + | {{:techtalk:evo:engmech:a91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:a04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) |
The air coming from the head vents has fine oil mist particles in suspension with it. \\ | The air coming from the head vents has fine oil mist particles in suspension with it. \\ | ||
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- | ====== Mods ====== | ||
====== Pics of Air Cleaners ====== | ====== Pics of Air Cleaners ====== |