Forced Induction Superchargers | Turbochargers | Intercoolers

Vapor/smoke from breather?

Thread Tools
 
Search this Thread
 
Old Oct 17, 2007 | 09:52 AM
  #1  
RW99's Avatar
Thread Starter
TECH Resident
 
Joined: Jan 2004
Posts: 832
Likes: 0
From: Castro Valley, CA
Default Vapor/smoke from breather?

I know many of us use valve cover breathers, so I posted up in the FI section.



I've had this breather for probably 5000 miles or so... and now when the car's running I can see faint smoke/vapor coming through it. Do I need to change the filter on this (it looks saturated) or clean it or ???

Thanks in advance for any info...
Reply
Old Oct 17, 2007 | 01:01 PM
  #2  
rufretic's Avatar
10 Second Club
iTrader: (37)
 
Joined: Jan 2004
Posts: 1,935
Likes: 0
Default

I'm not sure how often they need to be changed, that's a good question. But I do know it's pretty common for them to smoke like that, mines done it since I put it on.
Reply
Old Oct 17, 2007 | 02:00 PM
  #3  
ls1290's Avatar
Dumb Ass Vette Moderator
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (20)
 
Joined: Jun 2002
Posts: 4,281
Likes: 2
From: Colorado
Default

How long does it last or is it continous? If it is for a little bit on start up, then it is water vapor and pretty common.
Reply
Old Oct 17, 2007 | 04:48 PM
  #4  
RW99's Avatar
Thread Starter
TECH Resident
 
Joined: Jan 2004
Posts: 832
Likes: 0
From: Castro Valley, CA
Default

Hmmm, I'll get back to you on that...
Reply
Old Oct 17, 2007 | 05:33 PM
  #5  
Mark98SS's Avatar
9 Second Club
iTrader: (1)
 
Joined: Feb 2004
Posts: 737
Likes: 0
From: Fredneck, MD
Default

I've seen it most on warm up but I bet when the motor's hot it's got vapors coming out of it at WOT.
Reply
Old Oct 17, 2007 | 07:02 PM
  #6  
DeltaT's Avatar
TECH Addict
iTrader: (5)
 
Joined: Jun 2005
Posts: 2,404
Likes: 1
Default

Mine put out vapors for about 300 miles after I change the oil, and some on startup, and some after a hard run.

Jim
Reply
Old Oct 18, 2007 | 11:51 AM
  #7  
CrazyChris's Avatar
10 Second Club
iTrader: (5)
 
Joined: Aug 2004
Posts: 272
Likes: 0
From: Missouri
Default

If it is completely vented to atmosphere expect it to smoke a little all the time.
Reply
Old Oct 18, 2007 | 11:55 AM
  #8  
MECHAM's Avatar
TECH Fanatic
iTrader: (4)
 
Joined: Aug 2002
Posts: 1,243
Likes: 0
From: Colorado Springs
Default

i thought u need some sort of intake suction to remove the vapor at idle...
i have
so with the ls6 valley cover routed to the ls6 intake with 1 way check valve
valve cover nipple to catch can to induction side of air filter

i have no vapors at idle but

under wot there should be some smoke coming out to relieve the crank pressure

Last edited by MECHAM; Oct 18, 2007 at 12:02 PM.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Oct 18, 2007 | 12:27 PM
  #9  
MIGHTYMOUSE's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (59)
 
Joined: Nov 2001
Posts: 10,018
Likes: 51
From: Virginia
Default

correct, if you have no pcv (or as i insist it should be called NCV cuz its a vacuum) then any pressure will come out of the filter

engines do this on every start up because as the engine cools the hot air inside it has water condense out of it and puddles in places in the block. on start up this water eventually vaporizes and steams out.

still if no pcv you will see some blowby at idle and definitely at wot.

like mecham i draw air through my block and into the intake
Reply
Old Oct 18, 2007 | 03:42 PM
  #10  
DanWS6's Avatar
11 Second Club
iTrader: (5)
 
Joined: Feb 2005
Posts: 553
Likes: 0
From: Kansas City
Default

Originally Posted by MECHAM
i thought u need some sort of intake suction to remove the vapor at idle...
i have
so with the ls6 valley cover routed to the ls6 intake with 1 way check valve
valve cover nipple to catch can to induction side of air filter

i have no vapors at idle but

under wot there should be some smoke coming out to relieve the crank pressure
Or if you're lucky like me you get oil coming out at WOT because your rings are apparently shot.
Reply
Old Oct 18, 2007 | 08:35 PM
  #11  
displacementdan's Avatar
Teching In
 
Joined: Oct 2007
Posts: 45
Likes: 0
Default

clean with gas wait till dry then put back in depending upon ur catch can setup, of its just a fuel filter or a air pump filter u can jsut change it but otherwise lil gas pull the blowby out and u should be good.
Reply




All times are GMT -5. The time now is 10:45 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE