CCV relocation with Pictures
Senior User
Joined: Jun 2007
Posts: 367
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HeavyAssault,
Thats a good idea to start with. The elbow in the intake stream creates a low pressure area on the back side which creates a "suction" pulling the vapor, and oil, into the turbo. I believe this is known as the "venturi" affect; not unlike a carb works (remember those!).
I have 112K on my '03 and have been thinking of the CCV mod. I have never had the charge hoses off, and they haven't blown-off, but the oily build-up is there around the joints. I am going to try your mod first before I reroute the hose.
Removing the elbow and just allowing a smooth hole in the side of the intake will reduce the "sucking".
Thats a good idea to start with. The elbow in the intake stream creates a low pressure area on the back side which creates a "suction" pulling the vapor, and oil, into the turbo. I believe this is known as the "venturi" affect; not unlike a carb works (remember those!).
I have 112K on my '03 and have been thinking of the CCV mod. I have never had the charge hoses off, and they haven't blown-off, but the oily build-up is there around the joints. I am going to try your mod first before I reroute the hose.
Removing the elbow and just allowing a smooth hole in the side of the intake will reduce the "sucking".
Cargo Master
Joined: May 2002
Posts: 3,271
Likes: 229
From: Gulf Coast, FL
HeavyAssault,
Thats a good idea to start with. The elbow in the intake stream creates a low pressure area on the back side which creates a "suction" pulling the vapor, and oil, into the turbo. I believe this is known as the "venturi" affect; not unlike a carb works (remember those!).
I have 112K on my '03 and have been thinking of the CCV mod. I have never had the charge hoses off, and they haven't blown-off, but the oily build-up is there around the joints. I am going to try your mod first before I reroute the hose.
Removing the elbow and just allowing a smooth hole in the side of the intake will reduce the "sucking".
Thats a good idea to start with. The elbow in the intake stream creates a low pressure area on the back side which creates a "suction" pulling the vapor, and oil, into the turbo. I believe this is known as the "venturi" affect; not unlike a carb works (remember those!).
I have 112K on my '03 and have been thinking of the CCV mod. I have never had the charge hoses off, and they haven't blown-off, but the oily build-up is there around the joints. I am going to try your mod first before I reroute the hose.
Removing the elbow and just allowing a smooth hole in the side of the intake will reduce the "sucking".
You got the idea...I just wasn't sure of the technical terms for it all.
Thread Starter
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Junior User
Joined: Sep 2006
Posts: 87
Likes: 0
The intake will still pull in the vapors with or without the protrusion. If you think of it as pressure variables you can follow the path of the air flow.
The turbo causes the lowest pressure in the intake system which will draw air from the highest pressure first. There is a significant amount of pressure built up in the engine with blow-by. Pressure is significant but volume is low. It has to go somewhere. It will be pulled into the intake before air is moved through a restriction (or the air filter). Once the engine out demands the volume of the vapor, it will pull air through the filter. Of course this demand out weighs the volume of vapor on startup.
I would theorize that even if there is a curtain of air that acts to block the vapor it will not last as pressure will continue to build in the engine until it pushes through this curtain. This would not be good for your engine, especially one that is prone to oil leaks.
I am no physicist, just giving my hypothesis
The turbo causes the lowest pressure in the intake system which will draw air from the highest pressure first. There is a significant amount of pressure built up in the engine with blow-by. Pressure is significant but volume is low. It has to go somewhere. It will be pulled into the intake before air is moved through a restriction (or the air filter). Once the engine out demands the volume of the vapor, it will pull air through the filter. Of course this demand out weighs the volume of vapor on startup.
I would theorize that even if there is a curtain of air that acts to block the vapor it will not last as pressure will continue to build in the engine until it pushes through this curtain. This would not be good for your engine, especially one that is prone to oil leaks.
I am no physicist, just giving my hypothesis
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Junior User
Joined: Sep 2006
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Done. Yes there is pressure. Quite a bit, at that.
Senior User
Joined: Sep 2006
Posts: 253
Likes: 0
From: Santee, CA
Thanks Smiley1. That is good to know.
I would have assumed there was pressure, but even if there was not, it would really not change the picture. The intake has a slight vacuum on it (due to the turbo pull on the air filter). I agree with previous posts that cutting out the venturi in the intake will reduce the vacuum on the CCV, but that will not eliminate it. And since the CCV still come into the turbo inlet, the original problem still exists, that is the oil that is suspended in the air. It is this oil that causes the problems (ie coats everything in the intake). The canister/filter set up (like the one you made, or someone could purchase), simply takes the oil out of suspension. Thus only the air is drawn into the intake eliminating the problem (oil). As far as the argument about venting to open air vs back to the intake, from a functional standpoint I don't think it matters one way or the other. My concern is with some of the pending proposals for smog testing, this will be one place that is specifically checked. If it vents to open air (even though it is filtered), would cause a fail.
My 2 cents anyway.
I would have assumed there was pressure, but even if there was not, it would really not change the picture. The intake has a slight vacuum on it (due to the turbo pull on the air filter). I agree with previous posts that cutting out the venturi in the intake will reduce the vacuum on the CCV, but that will not eliminate it. And since the CCV still come into the turbo inlet, the original problem still exists, that is the oil that is suspended in the air. It is this oil that causes the problems (ie coats everything in the intake). The canister/filter set up (like the one you made, or someone could purchase), simply takes the oil out of suspension. Thus only the air is drawn into the intake eliminating the problem (oil). As far as the argument about venting to open air vs back to the intake, from a functional standpoint I don't think it matters one way or the other. My concern is with some of the pending proposals for smog testing, this will be one place that is specifically checked. If it vents to open air (even though it is filtered), would cause a fail.
My 2 cents anyway.
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Junior User
Joined: Sep 2006
Posts: 87
Likes: 0
I have no idea.
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Junior User
Joined: Sep 2006
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I am still concerned that the there is too much pressure in the canister with it breathing through the small neck on the external filter. I may add another one to be safe. I think I will try and remove that filter to see if the cotton is filtering everything. If I dont see any vapors, then I will open the larger and rout it back to the intake.
Fleet Mechanic
Joined: Oct 2006
Posts: 1,351
Likes: 242
From: North Florida
I don't think you have anything to worry about. It would be near impossible to build any significant pressure in the canister with that filter on it. I imagine the only reason that there is such a big hose coming out of the valve cover is to keep it from getting clogged up with all of the oily crud that goes through it.
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Junior User
Joined: Sep 2006
Posts: 87
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I don't think you have anything to worry about. It would be near impossible to build any significant pressure in the canister with that filter on it. I imagine the only reason that there is such a big hose coming out of the valve cover is to keep it from getting clogged up with all of the oily crud that goes through it.
Senior User
Joined: Jun 2007
Posts: 367
Likes: 0
Smiley1,
If you deceide to run a return line back to the turbo intake, lose the cotton and replace it with #3 steel wool.
The oily vapor moving thru the steel wool will cause the oil to "droplet" out of the vapor. It will then fall to the bottom of your canister. This is common technology for industrial oil mist eliminators and is maintenence free.
Concern with the cotton is that once it becomes saturated with oil it may clump in the bottom. Possible small cotton/oil clumps may migrate back up into the turbo intake (depending on pressures). Just my $.02.
If you deceide to run a return line back to the turbo intake, lose the cotton and replace it with #3 steel wool.
The oily vapor moving thru the steel wool will cause the oil to "droplet" out of the vapor. It will then fall to the bottom of your canister. This is common technology for industrial oil mist eliminators and is maintenence free.
Concern with the cotton is that once it becomes saturated with oil it may clump in the bottom. Possible small cotton/oil clumps may migrate back up into the turbo intake (depending on pressures). Just my $.02.
Thread Starter
|
Junior User
Joined: Sep 2006
Posts: 87
Likes: 0
Smiley1,
If you deceide to run a return line back to the turbo intake, lose the cotton and replace it with #3 steel wool.
The oily vapor moving thru the steel wool will cause the oil to "droplet" out of the vapor. It will then fall to the bottom of your canister. This is common technology for industrial oil mist eliminators and is maintenence free.
Concern with the cotton is that once it becomes saturated with oil it may clump in the bottom. Possible small cotton/oil clumps may migrate back up into the turbo intake (depending on pressures). Just my $.02.
If you deceide to run a return line back to the turbo intake, lose the cotton and replace it with #3 steel wool.
The oily vapor moving thru the steel wool will cause the oil to "droplet" out of the vapor. It will then fall to the bottom of your canister. This is common technology for industrial oil mist eliminators and is maintenence free.
Concern with the cotton is that once it becomes saturated with oil it may clump in the bottom. Possible small cotton/oil clumps may migrate back up into the turbo intake (depending on pressures). Just my $.02.
Freshman User
Joined: May 2007
Posts: 41
Likes: 0
From: Florida
anyone have an 03' that has done the ccv mod. I know a few have said to have a slight slope before runnin the hose down. If I cut my hose it will go stright down. My 90 degree elbow and hose is all one unit. The 04's elbow sits on that raised piece. 03's don't have that.