Oil leak from AN intake on M8 - Page 2 - Road Glide Forums
Intake and Exhaust Intake and Exhaust Systems for Road Glides

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post #11 of 19 (permalink) Old 11-25-2017, 04:27 PM
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I have the SE Ventilator on my 17 RGS and have had no issues. I also almost never hit the superslab, don't know if that's a factor or not.

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post #12 of 19 (permalink) Old 05-24-2018, 09:31 PM
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I installed the Arlen Ness big sucker over the winter too instead of going with the SE intake. Thats what I get for trying to save a little coin. Oil all over my bags. When I installed it, it seemed strange how there where no breather lines. It just seems like an odd design compared to the Vance and Hines naked O2 I had on my twin cam Street Glide which never gave me any issues. I just ordered the SE genuine intake. Tired of cleaning the oil off my bike. As another poster said; live and learn. Since I have the extended warranty I am sticking with official MOCO parts.
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post #13 of 19 (permalink) Old 08-21-2019, 12:03 AM
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I had the same problem yesterday after a 3 hr 80 mph ride. 2018 ultra with a fuel moto 120 kit and an AN big sucker breather. Dripped onto exhaust and wifes right foot.
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post #14 of 19 (permalink) Old 08-21-2019, 08:31 AM
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I Only Run 4qts an 8 oz. No more On really hot days 90 An running hard I get some Blow by with the Big Sucker,Oil level is Critacal on these M8s,Do not overfill some guys only run 4 qts.I recently Got A DIY Breather From DK Customs,Some Guys Have Made there own.Was $49.95 an $10 for Drill An Tap So $60The Instructions are good An easy job,You Can Hide every thing An solves The Oil problem in Any Air Cleaner,No more Oil drip or oil on Saddle Bag,A good inexpensive Product that works.
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2018 Wicked Red Road Glide Special 14 in.Yaffe Monkey Bars,Rinehart Slimline Duals,Power Vision Dynoed,Arlen Ness Big Sucker,Mustang seat,!4 in. Klock Werks Sport Tour Windshield.Cerwin Vega B52,Infinity Kappas.
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post #15 of 19 (permalink) Old 08-21-2019, 08:51 AM
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Its not an Arlen thing....its a HD thing as I have the same on my M8 right now - Not so much on Super Slabs but on "Spirited Riding" or extremely hot days......my right saddle bag gets freckled by oil out of the Intake....which is a HD Intake....but not the stock HD Intake......sucks but what can ya do? Price to pay when you tinker with the Stock Set Up I guess

I am running this Intake

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post #16 of 19 (permalink) Old 08-21-2019, 08:56 AM
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Originally Posted by Matthew04833 View Post
Thanks for the replies. After reading them, I've decided to just change out the intake and go with the S/E one. Especially regarding the warranty aspect of it. Live and learn eh?
First thing... If anyone has a dealership that would void ANY part of your warranty over a quality aftermarket A/C then they need to find a new dealership. Providing the A/C is installed correctly. If not, well then you're on your own.

As far as blow by goes, they all do it and it is up to the design of the backing plate on how it routes the oil. Keeping the oil level no more than halfway up the grid section can help. If I remember correctly the AN Big Sucker only has a couple of small breather hole right near the entrance of the intake with a ridge just below them to try and direct any oil towards the intake. The problem is that a little too much oil can run over that ridge and down to the bottom of the filter and eventually seep through the filter and drip outside. The fix if you wanted to keep this A/C is to run external breathers as it would clean up your issue as well as keeping the engine from having to burn up the blow-by. The reason a lot of other people say they don't have any issues with a SE or other types of A/C's is that they have a better design to direct the blow-by into the intake. Plus all engines are different, some do it more than others. I use the Arlen Ness Black Method A/C and the back plate has rubber breather fixtures that route the blow-by further into the intake which help keep it from having and chance of leaking down to the bottom. Also if oil does drain down it has a half cup piece that is just below the intake that would catch the oil keeping it from reaching the filter.

Oil is a hydro-carbon and is easily burned up during combustion and isn't a real issue unless it is excessive. It's done for EPA reasons to help protect the environment.
From your description I would guess that yours might be and I would strongly suggest you do the external breathers no matter what A/C you decide to run. There are plenty of threads on this forum on how to do it as well as a few YouTube videos.

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post #17 of 19 (permalink) Old 08-21-2019, 09:00 AM
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I posted on a different thread about mine puking oil on my 17 m8 with se intake. Dealer did box vents and it was a no go. I instaled the updated vent tubes and it stopped almost completely. It still has blowby I'm sure but no more mess.
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post #18 of 19 (permalink) Old 08-21-2019, 09:06 AM
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Originally Posted by Stoic Joker View Post
I've had a long nosed SE BS on my 96" 10 for years and never seen a drop of oil come out of it. But I'm not really sure we're an apples to apples comparison ... This may be more of an M8 thing than a BS thing..
Has nothing to do with M8 or TC. With your A/C there is no way the oil is going to travel up stream to get to the filter element. Any blow-by yours may have will go directly into the intake or just sit in the elbow section. The OP's BS is not the elbow design yours is.

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post #19 of 19 (permalink) Old 10-28-2019, 01:25 PM
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I have the same problem on my 2016 RG (not an M8) with the Screaming Eagle AC. Really frustrating and has been that way since I bought the bike new 3 years ago. I have heard that some companies make an add-on to help with this. Anyone know anything about aftermarket ad-ons to prevent the blow-by?
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