EVO All Evo Model Discussion

Lg engine head breathers?

Thread Tools
 
Search this Thread
 
Old May 1, 2017 | 09:17 AM
  #1  
aces&8s's Avatar
aces&8s
Thread Starter
|
Seasoned HDF Member
10 Year Member
Liked
Loved
Community Favorite
Joined: Sep 2012
Posts: 6,570
Likes: 590
From: almost there
Default Lg engine head breathers?

I had a thought which is rare.
Lg cube engines can make a lot of crankcase pressure and need good venting specially at high RPM. Head breather's normally piped to the carb would be pulling extra pressure thru carb vacuum.
NOT connecting them thru carb would loose that extra vacuum to relieve pressure. Thoughts?
 
Reply
Old May 6, 2017 | 05:15 AM
  #2  
grbrown's Avatar
grbrown
Club Member
15 Year Member
Liked
Loved
Community Favorite
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Default

I believe that some highly tuned engines have been built using both crankcase and head breathing systems, presumably to get the best of both worlds.
 
Reply
Old May 6, 2017 | 07:12 AM
  #3  
1997bagger's Avatar
1997bagger
Seasoned HDF Member
15 Year Member
Liked
Loved
Community Favorite
Joined: Aug 2008
Posts: 5,080
Likes: 2,153
From: Ohio
Default

Run them to the ground, I have ran mine before without any hose on the fittings and doesn't leak a drop, can hear it huffing at a idle but as long as the engine is sound, won't put a drop of oil on the ground.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
HD-1995
Carburetor Related
7
Nov 5, 2015 10:03 PM
CaptnAl
Sportster Models
7
Nov 20, 2012 05:41 AM
Morgan's
Exhaust System Topics
5
Oct 14, 2010 05:54 AM
solitaryman54
Ironhead
5
May 17, 2007 11:57 AM
mchaous
General Harley Davidson Chat
4
Oct 31, 2005 06:16 PM




All times are GMT -5. The time now is 12:40 AM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE