EVO Crankcase Breathing
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,293
Likes: 6,322
From: Honah Lee
Me too..I am wondering more where the crankcase cent hose hooks too.
Last edited by Jackie Paper; Jun 13, 2018 at 07:29 PM.
That's funny, right there!
I was wondering the same thing. Never thought about putting a gauge on the crank case vent.
As to the why, never thought about that either. I suppose there could be some weird, dynamic pressure wave effects going on where various pulses are harmonically cancelling each other.
I was wondering the same thing. Never thought about putting a gauge on the crank case vent.
As to the why, never thought about that either. I suppose there could be some weird, dynamic pressure wave effects going on where various pulses are harmonically cancelling each other.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,070
Likes: 2,115
From: Ohio
Believe it or not we have a program on a laptop that records crankcase pressure, it documents different rpm's, engine heat and can actually drop cylinders to load other cylinders. The recorded run is sent to Navistar and they determine if a engine under warranty gets replaced.
Banned
Joined: May 2018
Posts: 4,576
Likes: 978
From: Viet Vet, crossroads
Yea I know a manometer will dictate loses.
They are used all time in dyno shop to measure piston ring blow by.'
As in bigger engines.
I want to see how he did this on a little V twinn
They are used all time in dyno shop to measure piston ring blow by.'
As in bigger engines.
I want to see how he did this on a little V twinn
Trending Topics
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Any gauge he could put on a V-twin will be flopping all over the place unless you seal the passage and put a very small hole for air to bleed thru, but then you're not getting a very accurate reading now are ya?
Anyone who's pulled the timing plug knows just how much of a shitshow is going on in the crank when she's running.
Anyone who's pulled the timing plug knows just how much of a shitshow is going on in the crank when she's running.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Thread Starter
|
Advanced
Joined: Jun 2009
Posts: 53
Likes: 1
From: Creedmoor, NC
I removed the air cleaner cover on the S&S carb where the crankcase vent line terminates and cranked it up. there is more air coming out at idle, as compared to 2,000 RPM. Why?
I'm no typist! It is a vent line and not a "cent" line. I did not realize ba typo offended so many... LMAO!
I'm no typist! It is a vent line and not a "cent" line. I did not realize ba typo offended so many... LMAO!