Finally got my pvc rerouted on my 07 lbz, what a pain in the ... they would have to weld a metal bracket with a elect connector mounted on it right in frount of where you want to put your bypass in, it took a while but I finally figured out what to do and got her done!! Now I got the feel goods.

pics would be nice.

Anyone know if running both PCV hoses into one and then down is okay... Most people say it's okay but I'm just wondering if the two pressures somewhat cancel each other out. I do feel the pressure coming out but I'm worried that maybe the crankcase is not ventilating as welll as it should... I'm debating about running a line off each side... Any thoughts?

Two into one is fine and also the way it was on the LB7. Also your current LBZ setup combines both lines into one before entering the turbo inlet tube.

You may be better off keeping the PCV in the intake tract and just installing a catch can to stop the oil.

Two into one is fine and also the way it was on the LB7. Also your current LBZ setup combines both lines into one before entering the turbo inlet tube.

Yes, I realize that but with it routed to the intake port there was plenty of extra vacuum pulling it but without the vacuum I wonder if there is a pressure differential causing some vapor to stay locked in the motor..?

pics would be nice.
Ya woodchuck I agree with you, pictures would be nice if I was computer savy enough to put them on!! if interested I could print out exactly what I done! Jym...

It takes a little bit of engineering,a rubber table leg piece fits exactly to block the intake orifice and then you can cut out the center part of the original tubing (save this in case you need to reinstall to visit stealer)and then with a pvc tee & elbow along with 6ft of 3/4 in rad hose,redirect to the passenger side wheel well.Total cost 12$ and now peace of mind,no more oil
in the intake air system.Pictures would not show that this has been done since it looks totally oem.

Finally got my pvc rerouted on my 07 lbz, what a pain in the ... they would have to weld a metal bracket with a elect connector mounted on it right in frount of where you want to put your bypass in, it took a while but I finally figured out what to do and got her done!! Now I got the feel goods.


So I have seen a few post on this. Why would you want to reroute the PCV? And where do you reroute it to?

Thanks,

Keep the black oily gunk out of the turbo and intake. Reroute it out to the atmosphere down hill from where it is.

Keep the black oily gunk out of the turbo and intake. Reroute it out to the atmosphere down hill from where it is.


Thanks.

Thanks.


What would that hurt? I've had several diesels, and they all had oily stuff in the turbo. They lasted forever too. I'd be more worried about diluting my engine oil with diesel fuel blowby. A small amount of suction would flow the air instead of allowing the fuel to condense.

Keep the black oily gunk out of the turbo and intake. Reroute it out to the atmosphere down hill from where it is.

You risk blowing you seals out, you need the low pressure on the intake to help suck those gasses out.


IMO, run the stock PCV setup but put a catch can inline to stop the oil.

You risk blowing you seals out, you need the low pressure on the intake to help suck those gasses out.


IMO, run the stock PCV setup but put a catch can inline to stop the oil.

OK...now I'm hearing the pcv re-route is a bad thing. Any Duramax experts/mechanics out there know the truth. Is it beneficial to do the re-route or not???

You risk blowing you seals out, you need the low pressure on the intake to help suck those gasses out.


IMO, run the stock PCV setup but put a catch can inline to stop the oil.

What do you mean catch can?

IMO, run the stock PCV setup but put a catch can inline to stop the oil.


Lets see it

OK...now I'm hearing the pcv re-route is a bad thing. Any Duramax experts/mechanics out there know the truth. Is it beneficial to do the re-route or not???
???

Having the hose just dump to atmospheric pressure should be just fine,thats how my 02 LB7 worked and no blown seals.The hoses attach to each rockercover which have a spring loaded diaphram,lets out positive pressure so there is not dirty air being sucked back into the engine.

I've been told having a little vac in the crankcase help adds power. And I sure don't see how oil going into your turbo is bad, so I would leave it connected.

Oil going into the turbo probably is not so bad,but coating the inside of the intercooler with oil just doesnt sound good.At only 10,400 miles oil is seeping out of hose that runs from turbo to intercooler.I always thought that air leaks before liquids?Guess this thread could go on forever!

re-routed mine and have several trouble free miles. lots of pics in this thread.

http://www.dieselplace.com/forum/showthread.php?t=66728

so whats the pros and cons of doing this???

Lots of info on this site regarding PCV reroute. I did mine about 3 weeks ago and it seems like a good idea. I also had all kinds of oil seeping out of my intake hose and decided I didn't want my intercooler loaded with oil...Lots of diesels do it that way especially over the road trucks etc.. Obviously the Duramax has it's own design, maybe with the PCV connected but when my truck is running I can feel lots of air coming out of the hose I ran down the front of my truck.

What do you mean catch can?

it is basically a can at the lowest point of the line that gravity will take the oil to

Does anyone know for sure if a check-valve is necessary to prevent moisture and other contaminants from getting in the motor through the re-routed hose?

If it IS necessary...what would work as a good check-valve, which will still allow unrestricted flow out but not back in?

What do you mean catch can?

Its a can that will seperate the oil from the gasses. Works kind of like a dryer on an air line or a water fuel seperator.

Its a can that will seperate the oil from the gasses. Works kind of like a dryer on an air line or a water fuel seperator.


Where would you put it? I'm guessing you'd have to re-reoute a hose from the tee at the turbo inlet down to a catch can and then back up into the turbo. I like the idea though.

Where would you put it? I'm guessing you'd have to re-reoute a hose from the tee at the turbo inlet down to a catch can and then back up into the turbo. I like the idea though.
Thats exactly what you would have to do.

http://www.lnsauto.com/articles/ford_truck_performance_20051001/ford_truck_performance_20051001_article.shtml

Home made catch can setups
http://www.neonrick.com/oilair_howto.html

http://www.gassavers.org/showthread.php?t=290

http://www.srtforums.com/forums/showthread.php?t=97923

There are also a ton of cheap setups on ebay.

http://motors.search.ebay.com/oil-catch-can_W0QQfromZR40

Does anyone know for sure if a check-valve is necessary to prevent moisture and other contaminants from getting in the motor through the re-routed hose?

If it IS necessary...what would work as a good check-valve, which will still allow unrestricted flow out but not back in?
There is valves in the valve cover stoping back flow, dont add anymore restiction, if you do than you are asking for problems.

Reasons for GM to have the vent tubes routed to preturbo is for several reasons, 1 not to have an oil spot in the driveway from it driping off the vent tube, 2 to pass under hood emisions

There is valves in the valve cover stoping back flow, dont add anymore restiction, if you do than you are asking for problems.

Reasons for GM to have the vent tubes routed to preturbo is for several reasons, 1 not to have an oil spot in the driveway from it driping off the vent tube, 2 to pass under hood emisions

Thank you sir...Looks like you're someone that knows what he's talking about so I really appreciate it.

yes, and notice how neither of those reasons mentioned were any thing along the lines of: "because it works better" or "helps the motor run better and last longer". i haven't had any oil on my garage floor to date. might show up later but nothing now.

My LB7 did drip a little but the LLY with the pcv rerouted and pushing over 800 HP at the wheels has never dripped once.

Mine hasn't caught the drips yet either :D

Never a drip here.... But if anyone has a bothersome drip you can always do like the cummins guys and tywrap an old sock at the end of the hose then change it out at each oil change.