K & N filters
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Road Master
Joined: May 2008
Posts: 957
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From: New York / Texas
K & N filters
This year i put on a Screaming Eagle Ventilator high flow A/C. Installed a K & N filter as soon as it was available had no problems with oil blow by unti 3500 miles. Just a thougt that the filter was just dirty enough that it would not allow enough air flow to suck the oil into throtle body to be burned off by engine. So my thought is if you clean it at 2500 miles and not 5000 miles you might not have the oil blow by.
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
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From: Glendale AZ
Im not convinced thats why you started to have blowby problems....i guess the way to tell is clean the filter and if you no longer have the blowby issue than thats the reason...im thinking not but will watch this thread for further developments
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
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From: Simi Valley, CA
I'm not sure about your theory. Not saying your wrong, simply questioning.
I'd think the more likely explanation is that it will take a while for the oil blow-by to build up in the A/C in sufficient quantity before you'll actually notice it dripping from the A/C. Now if that time turns out to be 3500 miles in your case and you clean the A/C every 2500, you'll think you have the problem solved. But I'd think that your blow-by issue is still the same, you just haven't reached the threshold for the oil to start dripping yet.
Unless your dirt-tracking there should be no reason to clean a K&N filter as often as 2500, or even 5000, miles.
Not saying that I'm right for certain either, but I do think my theory is plausible.
I'd think the more likely explanation is that it will take a while for the oil blow-by to build up in the A/C in sufficient quantity before you'll actually notice it dripping from the A/C. Now if that time turns out to be 3500 miles in your case and you clean the A/C every 2500, you'll think you have the problem solved. But I'd think that your blow-by issue is still the same, you just haven't reached the threshold for the oil to start dripping yet.
Unless your dirt-tracking there should be no reason to clean a K&N filter as often as 2500, or even 5000, miles.
Not saying that I'm right for certain either, but I do think my theory is plausible.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
the K&N flows much more than the motor could ever demand, even with a fair layer of dust on it.
It's a great design and good media ( and there are test results at their site showing flow results when dirty vs OEM filters).
Blow by is the result of many things, overfill tank, rpm, hi rpm sustained operation, cam profile, exhaust pipe characteristics, piston seal ( rings), umbrella valves etc.
- blow by is not a part of my life or a concern on any of my Harleys
mike
It's a great design and good media ( and there are test results at their site showing flow results when dirty vs OEM filters).
Blow by is the result of many things, overfill tank, rpm, hi rpm sustained operation, cam profile, exhaust pipe characteristics, piston seal ( rings), umbrella valves etc.
- blow by is not a part of my life or a concern on any of my Harleys
mike
Extreme HDF Member
Joined: Jun 2011
Posts: 10,216
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From: Glendale AZ
I hear this problem mentioned a lot and heard everything from keep your oil level 1/2qt low etc. But what has me saying huhh is on my RK i have the level right up at the top and i dont have a drip issue. So that has me wondering a few things like does the rocker breather gasket normally do this as the engine gets some miles on it, or does it happen after a modified AC is installled? So what is the common denominator as to why the condition materializes and not there from the onset? Now my Metric bike (pissed) oil from the start to the extent i had a collection bottle that would need cleaning out after 300-400 miles (PITA to say the least).
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
It most cases the operator realizes the existence of oil mist condensing in the breather after adding a non-sealed "performance" breather system.
In the oem, oil condensate often mixes with dust to form a stable crust inside the plastic cover.
mike
In the oem, oil condensate often mixes with dust to form a stable crust inside the plastic cover.
mike
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Elite HDF Member
Joined: Nov 2010
Posts: 3,846
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From: Simi Valley, CA
I was reading a thread the other day regarding engine break-in, specifically ring seating. In that thread I presented a theory that maybe the reason some bikes drip oil from the A/C and others do not, could be related to the way the bike was broken-in and how well the rings were initially seated. My train-of-thought was if the rings did not get seated as well in some bikes vs. others, that could be the reason some bikes experience higher blow-by and therefore more oil through the breathers and into the A/C.
I run both of my bikes at the full mark for oil level and have never had an issue with oil dripping from my A/C. If you listen to the proponents for running a half a quart or so low on oil, both of my bikes should be dripping from the A/C and that is not the case.
This issue may boil down to the way the bike was broken-in. Or at least, that may be a contributing factor.
I run both of my bikes at the full mark for oil level and have never had an issue with oil dripping from my A/C. If you listen to the proponents for running a half a quart or so low on oil, both of my bikes should be dripping from the A/C and that is not the case.
This issue may boil down to the way the bike was broken-in. Or at least, that may be a contributing factor.
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Extreme HDF Member
Joined: Jun 2011
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From: Glendale AZ
Interesting theory, sounds like a good topic for a thread, "How did you breakin your motor?"...OP what are your thoughts, what was the breakin on your bike and did it Mist before you did a Mod to the AC?
Outstanding HDF Member
Joined: Dec 2009
Posts: 2,312
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From: Missouri
The blow by is building up at the bottom of the filter. If you pull it off you will notice the littler rubber hoses that direct the blowby into the throttle body are very short, I think too short.