Anyone doing the breather bypass on your M8? - Page 3 - Harley Davidson Forums

Go Back  Harley Davidson Forums > Harley Davidson Motorcycles > Milwaukee Eight (M8)
Reload this Page >

Anyone doing the breather bypass on your M8?

Notices
Milwaukee Eight (M8) 2017 and up M8 Air and Liquid Cooled discussion

Anyone doing the breather bypass on your M8?

  #21  
Old 11-28-2016, 10:01 PM
ron1026's Avatar
ron1026
ron1026 is offline
Senior Rider
Join Date: Apr 2006
Location: long island ny
Posts: 438
Thanked 13 Times in 13 Posts
Default

Welcome aboard Mr Bryce, Your experience and knowledge is appreciated.

Ron Baumer
 
The Following User Says Thank You to ron1026 For This Useful Post:
16Slim (12-02-2018)
  #22  
Old 11-29-2016, 09:15 AM
bradn's Avatar
bradn
bradn is offline
Road Master
Thread Starter
Join Date: Apr 2016
Location: Davenport, IA
Posts: 1,133
Thanked 177 Times in 144 Posts
Default

Originally Posted by CR3999 View Post
Pull the stock hoses off and throw away.

route to ground or install a catch can. Looking at the SE AC there will be some drilling the backing plate as they they reuse the same bolts as the stock air box. Also the air box is a lot closer the jug. There's not enough room do install like the twin cams, as there isn't enough room.

This is the way I did the by pass. Your plan my vary.
Do you get any oil blowing back up on the bike from the outlet on the tube under the frame?
 
  #23  
Old 11-29-2016, 09:28 AM
CR3999's Avatar
CR3999
CR3999 is offline
Road Captain
Join Date: Aug 2005
Location: College Station TX
Posts: 704
Thanked 94 Times in 70 Posts
Default

I haven't noticed any on the bike. I have reached down to see if there is any oil at the end of the hose, there is. And If I really looked I'm pretty sure there may be some under the bike, but if I can't see it, it didn't happen.
 
The Following User Says Thank You to CR3999 For This Useful Post:
bradn (11-29-2016)
  #24  
Old 11-29-2016, 12:16 PM
Heloguy's Avatar
Heloguy
Heloguy is offline
One Of The Regulars
Join Date: Jul 2014
Location: Matawan, NJ
Posts: 107
Thanked 9 Times in 9 Posts
Default

I read somewhere that the new M8 engines vent into the transmission. Basically eliminating the need to do this mod.
I hope I didn't misread that.
 
  #25  
Old 11-29-2016, 12:50 PM
GlidingJoe's Avatar
GlidingJoe
GlidingJoe is offline
Road Warrior
Join Date: Feb 2013
Location: Upper Providence Pa
Posts: 1,626
Thanked 89 Times in 76 Posts
Default

Originally Posted by Heloguy View Post
I read somewhere that the new M8 engines vent into the transmission. Basically eliminating the need to do this mod.
I hope I didn't misread that.
You did not misread that. you are correct in what you read, that it vents to the trans., but it does not mean everything you read is correct.
 
  #26  
Old 11-29-2016, 04:23 PM
bradn's Avatar
bradn
bradn is offline
Road Master
Thread Starter
Join Date: Apr 2016
Location: Davenport, IA
Posts: 1,133
Thanked 177 Times in 144 Posts
Default

Originally Posted by GlidingJoe View Post
You did not misread that. you are correct in what you read, that it vents to the trans., but it does not mean everything you read is correct.
Sooooo, which part is incorrect?
 
  #27  
Old 11-29-2016, 04:28 PM
GlidingJoe's Avatar
GlidingJoe
GlidingJoe is offline
Road Warrior
Join Date: Feb 2013
Location: Upper Providence Pa
Posts: 1,626
Thanked 89 Times in 76 Posts
Default

Originally Posted by bradn View Post
Sooooo, which part is incorrect?
the fact that you don't need to do it. HAHAHA

I know when they did the tear down on mine for my 117" kit at 800 miles, the cylinder already showed signs of oil being introducing into the combustion chamber burnt into the top of the piston
 
  #28  
Old 11-29-2016, 04:54 PM
rjjj629's Avatar
rjjj629
rjjj629 is offline
Road Warrior
Join Date: Jul 2015
Location: Ohio
Posts: 1,504
Thanked 322 Times in 233 Posts
Default

Originally Posted by bradn View Post
Sooooo, which part is incorrect?
I didn't read the same article so I can't say but in the M8 oil vapor from the breather on the top of each cylinder does indeed find its way into the air cleaner housing. Whether or not you feel the need to vent that to atmosphere, or catch can, or pavement is entirely up to you.
 
  #29  
Old 11-29-2016, 05:08 PM
Max Headflow's Avatar
Max Headflow
Max Headflow is offline
Ultimate HDF Member
Join Date: Dec 2005
Location: poway
Posts: 6,231
Thanked 881 Times in 736 Posts
Default

Originally Posted by bradn View Post
Sooooo, which part is incorrect?
He read what was written correctly but what he read wasn't correct..
 
  #30  
Old 11-29-2016, 05:37 PM
sixguns's Avatar
sixguns
sixguns is offline
Outstanding HDF Member
Join Date: Nov 2013
Location: SW Washington State
Posts: 3,093
Thanked 540 Times in 383 Posts
Default

I read a couple of those articles that got it wrong, what I think they did was misunderstand that the Oil return from the heads travels through a passage in the trans case to get back to the oil pan.

I ran external on my Twincam, Witness what comes out of the breather hose, its mostly condensation [ water] and some snot. there is no way in hell you can dump that mix of oil and condensation into the transmission.

I ran external after installing a S&S tear drop on my twincam, that cleaner did a poor job of directing blowby into the module, it all ended up on the filter bottom and kept dripping, I had a routine of wiping it off with my finger every time I stopped and onto my pants leg. here is a pic of that breather.

I am not concerned with my M8, I dont think it hurts the engine at all. but if it drips, I will address it for that reason.
 
Attached Thumbnails Anyone doing the breather bypass on your M8?-20160521_134002.jpeg   Anyone doing the breather bypass on your M8?-20160522_112144.jpeg  

Thread Tools
Search this Thread
Quick Reply: Anyone doing the breather bypass on your M8?


Featured Sponsors
Vendor Directory

Contact Us About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: