Does this PCV look ok?
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
Does this PCV look ok?
The first picture is for an LS6 that has the galley hose. The second is a 98 LS1 without. I have little stainless breathers to go on the back of the valve cover on the drivers side. I cant remember if the 99 has that port or not. Does this look ok to you guys? I will be blocking off the throttle body port. Any input would be great!
Last edited by 95BlueBomber; May 9, 2007 at 04:10 PM.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
There's a lot of information regarding PCV setups... check them out via a search.
Your diagram shows the crankcase vented. If your objective is to only prevent a pressurized crankcase this will work although you could probably accomplish the same without the second breather.
Arnel
Your diagram shows the crankcase vented. If your objective is to only prevent a pressurized crankcase this will work although you could probably accomplish the same without the second breather.
Arnel
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
There's a lot of information regarding PCV setups... check them out via a search.
Your diagram shows the crankcase vented. If your objective is to only prevent a pressurized crankcase this will work although you could probably accomplish the same without the second breather.
Arnel
Your diagram shows the crankcase vented. If your objective is to only prevent a pressurized crankcase this will work although you could probably accomplish the same without the second breather.
Arnel
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
The downside is that you appear to have eliminated the vacuum source, so you no longer have positive crankcase ventilation. There's no pressure differential feeding fresh air into the engine.
As Arnel said, if you just want to vent the crankcase, I don't see the value of the second small breather.
As Arnel said, if you just want to vent the crankcase, I don't see the value of the second small breather.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
IF pulling nasty vapors is important then..
let's just say your going to pull blowby from a single point on each valve cover. The OEM vacuum source is the intake manifold through the PCV... if used, it will need to be protected of oil being sucked into it via a separator or catchcan. It is important that the catchcan being used is separating or baffling between the ports hooked to the crankcase and the intake (vacuum source). Also, between the catchcan and the vacuum source should be a checkvalve (inplace of the PCV) that only allows air to enter the intake and never the other direction (as would be happening when in boost if no checkvalve is present).
Some folks will allow a little bit of air to enter the crankcase so that too much vacuum isn't built up in the crankcase. This is done via a filtered, controlled, incoming leak (right about where you show the second breather).
Arnel
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
A really common setup is to use a breather (such as the ECS breather) at the oil filler, and a non-vented catch can between the valve cover and the intake.
I use the PCV valve as a check valve, but some people don't like that idea for reasons I don't understand.
I use the PCV valve as a check valve, but some people don't like that idea for reasons I don't understand.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
If it were really that simple there would be the perfect setup and solution... that doesn't exist just yet 
Your line to the intake needs a catchcan. it goes like this... crankcase (this could be anything pulling from the crankcase but large enough to keep pressure from registering in the crankcase at the highest levels of blowby. Could be valley cover but easier to put a larger fitting at a valve cover) then checkvalve then intake.
Arnel
Your line to the intake needs a catchcan. it goes like this... crankcase (this could be anything pulling from the crankcase but large enough to keep pressure from registering in the crankcase at the highest levels of blowby. Could be valley cover but easier to put a larger fitting at a valve cover) then checkvalve then intake.
Arnel
