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

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post #1 of 19 (permalink) Old 11-24-2017, 11:46 AM Thread Starter
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Oil leak from AN intake on M8

I recently installed a Arlen Ness Big Sucker on my 2017 RGS and noticed on long rides I'll get oil all down the side of my bike at the end of the day. When I changed the oil I left it about 3/4 qt shy of full to see if they would help. It didn't, so I emailed Arlen about it and they said its blow by and there's nothing they could do? I don't disagree its blow by but it does seem a bit much for it. Anyone else experiencing this or have an clue what else it could be. I still yet to call the dealer about it.


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post #2 of 19 (permalink) Old 11-24-2017, 12:14 PM
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it's crankcase breathing at its finest. that oil has to go somewhere.

check the factory setup and you'll find that HD runs it back into the intake...

you could run a line with a one-way (pcv) valve to the back of the bike if you want.

just make sure it's not getting on the rear tire or you'll be slippin' and a slidin'
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post #3 of 19 (permalink) Old 11-24-2017, 12:38 PM
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Quote:
Originally Posted by Matthew04833 View Post
I recently installed a Arlen Ness Big Sucker on my 2017 RGS and noticed on long rides I'll get oil all down the side of my bike at the end of the day. When I changed the oil I left it about 3/4 qt shy of full to see if they would help. It didn't, so I emailed Arlen about it and they said its blow by and there's nothing they could do? I don't disagree its blow by but it does seem a bit much for it. Anyone else experiencing this or have an clue what else it could be. I still yet to call the dealer about it.



Matthew04833 might want to feel out your dealer on warranty before you take that ride. There is another string by a member here somewhere that had similar issues and warranty issues because of non HD parts. I think this is a dealer to dealer type of call but might be worth sticking your toe in the water before jumping in.

Just saying
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post #4 of 19 (permalink) Old 11-24-2017, 01:13 PM
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I would still add a little more oil into you sump, 3/4 of a quart is a little "too under". The blow by happens especially on longer interstate trips where the motor runs at constant rpms for long periods. There have been a couple fixes proposed, one guy even put a "feminine pad" into the bottom of the air cleaner cover to "soak up" the oil, changed it daily. Not a great fix in my opinion but stopped the flow of oil onto his pant legs, saddlebag and side cover. While not the most manly of things to do, it is probably the cleanest and less intrusive fix that I have heard about. Others have used hose to drain away the oil to the ground, right in front of their rear tire, not a lot of oil all at once but still not a great practise. Others have rigged catch cans to hold the drips.

Seems to be a flaw in the Arlen Ness design that doesn't allow the oil to go back into the intake to be burned up in combustion. I had that same problem on an Arlen Ness Big Sucker II that I ran on my 08. Finally took it off, I could smell the oil it was that bad.

Heed the warning others have given regarding contacting your dealer about your M8 issues. The MOCO mothership is on their dealers like ugly on a moose about changes to the power train that are not authorized or that are not Harley parts. They could flag your bike for power train warranty and then you have a fight on your hands. They are looking for any excuse to void warranty these days it seems (this is my opinion and not a proven fact).


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post #5 of 19 (permalink) Old 11-24-2017, 03:12 PM
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me too

I had it on my Roadglide M8 also. stage I, headers, tts tuner, K&N high flow filter. blew oil like a siv. dealer replaced the valves in the rocker boxes, helped. I now have an RGU that is stock, no oil blow by. very happy.
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post #6 of 19 (permalink) Old 11-24-2017, 04:44 PM
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Sounds like these aftermarket intake guys haven't learned how to make an intake for the M8 yet. Haven't read any issues with Harley Genuine parts yet.


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post #7 of 19 (permalink) Old 11-25-2017, 12:05 PM Thread Starter
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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?


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post #8 of 19 (permalink) Old 11-25-2017, 12:16 PM
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I had one on my 103 Street Glide 18,000 Miles No Problem,I now Have one on my 18 RGS NO Problems.These Big Suckers Dyno Very well,To bad you guys are Having these problems.My Dyno Shop has always run these.My bikes have always run very Strong.


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post #9 of 19 (permalink) Old 11-25-2017, 12:22 PM
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I had blow by issues on my 14 Street glide (Stage 1). I now have a 17 RGS with ventilator air cleaner. No issues.


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post #10 of 19 (permalink) Old 11-25-2017, 02:23 PM
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Quote:
Originally Posted by Clutched View Post
I had one on my 103 Street Glide 18,000 Miles No Problem,I now Have one on my 18 RGS NO Problems.These Big Suckers Dyno Very well,To bad you guys are Having these problems.My Dyno Shop has always run these.My bikes have always run very Strong.
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..

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