04 Pcv
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Melting Slicks
Joined: Mar 2002
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From: Tx
04 Pcv
Quick question. I saw a stock ’04 the other day and the PCV system looked different. The line came out of the valley cover and went straight into the intake manifold with no valve inline. Is this how the ’02 ls6 cars were setup? I seem to remember seeing a valve on those.
So where is the valve? Is it integrated into the valley cover baffle?
I installed and ls6 valley cover on mine but I never checked to see if there was some type of integrated valve in the baffle.
I know this is better suited for the tech section, but I just feel I will get better answers here.
So where is the valve? Is it integrated into the valley cover baffle?
I installed and ls6 valley cover on mine but I never checked to see if there was some type of integrated valve in the baffle.
I know this is better suited for the tech section, but I just feel I will get better answers here.
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From: http://www.mphparts.com 800-364-1975
Originally Posted by QuickSilver2002
I know this is better suited for the tech section, but I just feel I will get better answers here.
Hope somebody knows, I'm really interested in the PCV design and working out a system for my car that will keep the intake and cylinders ultra clean.
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Originally Posted by diynoob
Hope somebody knows, I'm really interested in the PCV design and working out a system for my car that will keep the intake and cylinders ultra clean.
It's called alky injection
The intake and cylinders stay unbelievibly clean even after high milage and abuse.BTW, for 04 FI cars we have been installing a catch can and pcv valve.
Le Mans Master
Joined: Sep 2000
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From: Clouds Over California
Sounds like they eliminated the valve in the line. The little spring loaded POS valve only controlled pressure one direction, although when it gets weak, boost pressure can overcome it. Maybe GM figured it was not needed anymore as long as the oil/vapor will blow back into the intake. As far as I am concerned its not even necessary.
I agree I have seen motors with the heads off that use alky/water injection, its amazing how clean everything is.
I agree I have seen motors with the heads off that use alky/water injection, its amazing how clean everything is.
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From: http://www.mphparts.com 800-364-1975
Originally Posted by DOUG @ ECS
You already have it Tony,
It's called alky injection The intake and cylinders stay unbelievibly clean even after high milage and abuse.
BTW, for 04 FI cars we have been installing a catch can and pcv valve.
It's called alky injection
The intake and cylinders stay unbelievibly clean even after high milage and abuse.BTW, for 04 FI cars we have been installing a catch can and pcv valve.
Thread Starter
Melting Slicks
Joined: Mar 2002
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From: Tx
Doug,
Are you saying you put in a PCV valve and a check valve or just a check valve.
My understanding is that a PCV valve is more of a vacuum regulator (it flows less as vacuum increases and more as vacuum drops). I want this behavior because I don’t want a bunch of unmetered air at idle/decel. This is only a concern when you run breathers, since the stock setup takes in metered air from just in front of the throttle body.
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
Are you saying you put in a PCV valve and a check valve or just a check valve.
My understanding is that a PCV valve is more of a vacuum regulator (it flows less as vacuum increases and more as vacuum drops). I want this behavior because I don’t want a bunch of unmetered air at idle/decel. This is only a concern when you run breathers, since the stock setup takes in metered air from just in front of the throttle body.
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Originally Posted by QuickSilver2002
Doug,
Are you saying you put in a PCV valve and a check valve or just a check valve.
My understanding is that a PCV valve is more of a vacuum regulator (it flows less as vacuum increases and more as vacuum drops). I want this behavior because I don’t want a bunch of unmetered air at idle/decel. This is only a concern when you run breathers, since the stock setup takes in metered air from just in front of the throttle body.
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
Are you saying you put in a PCV valve and a check valve or just a check valve.
My understanding is that a PCV valve is more of a vacuum regulator (it flows less as vacuum increases and more as vacuum drops). I want this behavior because I don’t want a bunch of unmetered air at idle/decel. This is only a concern when you run breathers, since the stock setup takes in metered air from just in front of the throttle body.
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
Last edited by DOUG @ ECS; Feb 3, 2005 at 09:50 AM.
Le Mans Master
Joined: Sep 2000
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From: Clouds Over California
Originally Posted by QuickSilver2002
Doug,
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
Shinobi,
I agree that it is not necessary, but I’m sick of the smell and want to start daily driving my car more.
I know dude..but did you see the pics of Noob's motor when he had the heads off...that is the same reason I removed that POS PCV.
Originally Posted by DOUG @ ECS
If you take a stock pcv valve and blow threw it, it will alow you to blow towards the intake (allowing vaccum) but not away from the intake (restricting boost from going into the crank case) so it sort of acts like a check valve. I know there are differences in pcv valves from year to year, or at least different part numbers, but they all seam to function the same. This is a good question for Phil (Roadrunner) since he has so much GM insight.
Last edited by Shinobi'sZ; Feb 2, 2005 at 08:34 PM.
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Melting Slicks
Joined: Jan 2003
Posts: 3,251
Likes: 4
Originally Posted by diynoob
Hope somebody knows, I'm really interested in the PCV design and working out a system for my car that will keep the intake and cylinders ultra clean.
How far are you willing to go to vac the crankcase? HotRod magazine says you can get 25 extra ponies but look how big this this is.
HOTROD Mag on Vacuum pump by Moroso
Article on automotive vac pumps
Last edited by IM QUIKR; Feb 2, 2005 at 08:51 PM.
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From: http://www.mphparts.com 800-364-1975
Originally Posted by IM QUIKR
Noob,
How far are you willing to go to vac the crankcase? HotRod magazine says you can get 25 extra ponies but look how big this this is.
How far are you willing to go to vac the crankcase? HotRod magazine says you can get 25 extra ponies but look how big this this is.
Here's one meant for brakes that draws 16" of vacuum for $259:
http://www.jegs.com/cgi-bin/ncommerc...55&prmenbr=361
Hmm..
Melting Slicks
Joined: Jan 2003
Posts: 3,251
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Originally Posted by diynoob
Wow, very interesting. Those things are $300 to $500 though and only draw 10" of vacuum. I think an electric pump operated by a boost controlled switch is the best avenue... whoever does something like that must be a really smart person.
Here's one meant for brakes that draws 16" of vacuum for $259:
http://www.jegs.com/cgi-bin/ncommerc...55&prmenbr=361
Hmm..
Here's one meant for brakes that draws 16" of vacuum for $259:
http://www.jegs.com/cgi-bin/ncommerc...55&prmenbr=361
Hmm..
One question though. Would you cap off the fresh air port when you install it? I suppose you should. Otherwise you'll never achieve actual static vacuum. Personally I believe that the fresh air port is needed to allow a free flow of air thru the crankcase to keep things clean and not stress the seals. I guess I'm more concerned about positive pressure than negative pressure(oxymoron, but you know what I mean).
Last edited by IM QUIKR; Feb 2, 2005 at 10:49 PM.