External breather emissions
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Tourer
Joined: Apr 2015
Posts: 263
Likes: 1
From: SoCal
I have been thinking about one, just hadn't seen anything small enough. What did you go with?
Tourer
Joined: May 2014
Posts: 414
Likes: 8
From: NJ
I did a dk custom AC with the breather system. It came with a little breather filter. I've seen that others have picked up little filters at any auto parts stores.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
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From: Detroit
OP, you could run that hose into a beer can if you don't want it dripping. That would be kinda Harley-themed.
Tourer
Joined: Nov 2014
Posts: 362
Likes: 22
From: New York
I keep my oil level on my Fat Bob half way on the dip stick. Manual says anywhere between the full and add mark, while checking hot oil is fine. I get no misting whatsoever using the DK external breather bolts.
Outstanding HDF Member
Joined: Dec 2012
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From: Texas
I beg to disagree. Regardless of what you think about dry-sump systems...ALL air cooled engines need the correct oil level to help keep them cool as well as lubrication. Intentionally under servicing your oil level, even by a few ounces, is just inviting a serious engine failure someday...just say'n
Road Captain
Joined: Oct 2014
Posts: 722
Likes: 9
From: Williamsport, MD
I beg to disagree. Regardless of what you think about dry-sump systems...ALL air cooled engines need the correct oil level to help keep them cool as well as lubrication. Intentionally under servicing your oil level, even by a few ounces, is just inviting a serious engine failure someday...just say'n
this may be good advice, I was in the other boat, keeping mine halfway on the stick with the engine hot. I was doing that to keep my air filter clean. now that I have an external breather & see nothing coming out maybe I should add a bit more oil..
makes sense that more oil should keep the engine cooler.
But on the other hand as long as your oil level is between the marks then you shouldn't have any real problems.
just to note. the external breather also keeps moisture from going back into the intake, not just oil.
Advanced
Joined: Aug 2010
Posts: 89
Likes: 0
From: McLouth Kansas
I put a small inline fuel filter for a lawn mower on my hose to use as a catch can. The filter is clear plastic and when the oil crud builds up in it I just reverse flush it out with brake cleaner. My filter is tucked up under my carb and it is not easily in view. 00 fxdwg model.
Tourer
Joined: Dec 2012
Posts: 346
Likes: 4
From: Ponchatoula, LA
So what good does that do? Doesn't the oil just collect inside the filter and eventually drip out?
I've been meaning to swap out my intake for a dk one with the external breathers, I run the bike pretty hard and it doesn't take much for the air filter to start dripping oil. I have a maintenance plan with the dealer so they do all the oil changes so it's right under the full line when hot. I was gonna get this http://www.tt-motorcycles.com/catalo...VERFLOW_CA.htm and see if I can rig it up to use as a catch can.
I've been meaning to swap out my intake for a dk one with the external breathers, I run the bike pretty hard and it doesn't take much for the air filter to start dripping oil. I have a maintenance plan with the dealer so they do all the oil changes so it's right under the full line when hot. I was gonna get this http://www.tt-motorcycles.com/catalo...VERFLOW_CA.htm and see if I can rig it up to use as a catch can.
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Outstanding HDF Member
Joined: Aug 2012
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From: Detroit
I beg to disagree. Regardless of what you think about dry-sump systems...ALL air cooled engines need the correct oil level to help keep them cool as well as lubrication. Intentionally under servicing your oil level, even by a few ounces, is just inviting a serious engine failure someday...just say'n
On an air-cooled engine which relies on splash lubrication (rather than being pressure-fed), you'd be right that oil level is much more critical. You'd also be right that if we had a completely separate oil tank (like on a softail), when the oil level is higher in the tank, there might be slightly more heat transfer from the oil, to the walls of the tank, and then to the air. But our Dyna oil tanks are essentially one-piece with the engine/transmission assembly, so added cooling from running a higher oil level would be practically non-existent.
Last edited by Warp Factor; Jun 4, 2015 at 04:53 AM.
