CCV Mod Question
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Postmaster
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From: Kearney, Nebr
CCV Mod Question
Thinking about doing the CCV mod when I redue my intake and put the 6637 napa filter on. Can I just run a 3/4" house straigth down and let it vent out under the engine compartment? Also, is there anything I need to look for when doing the intake mod? I've been researching quite a bit on the 99' forum, haven't seen much about this for the older PSD's.
Posting Guru
Joined: Apr 2004
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From: AZ
The napa 6637 filter intake is the same basic thing for the obs powerstrokes. I would recomend a 6-8" piece of 4" exhaust pipe to put in the filter and the stock intake hose. Get a good heavy duty clamp for the filter, I think they are for an exhaust system, they use a bolt to tighten. I dont know much about the ccv mod, but I thought it needed to run along the frame rail.
Posting Guru
Joined: Aug 2004
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From: Braham MN
the 4" 45º exhaust pipe idea is SWEET, I have done that on a few. I chose to totaly delete the CCV housing when I did mine, so I had to fab a complete intake turbo to filter.
look here for CCV pics.
http://community.webshots.com/album/344525237nQuMGc
Diesel Rod
look here for CCV pics.
http://community.webshots.com/album/344525237nQuMGc
Diesel Rod
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Joined: Sep 2003
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From: Cleveland TN
I did the ccv mod when I put together my intake but I didn't use any of the factory intake pieces. I have a hose running off the dog house over brake booster and down the frame rail just behind the cab I don't have a problem with smell sometimes misty smoke comes out that looks like an exhaust leak under truck with it there though. Think when I do my intercooler I will put a bung in the exhaust pipe but don't know yet. I have pictures of all of this in my gallery for info. 
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Joined: May 2001
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From: Cabot, Arkansas
Originally Posted by FARM69
Can I just run a 3/4" house straigth down and let it vent out under the engine compartment?
Posting Guru
Joined: Oct 2005
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From: Wisconsin
what advantages are there to running it down in the engine compartment and not into the turbo intake??
thanks
Mitch
thanks
Mitch
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From: West Texas
My vote would be to weld a small length of pipe inside the exhaust pipe at somewhat of an angle like a 45 or so as mentioned already. Just make sure to stick about 3-6 inches of the small pipe the hose slips on inside the exhaust pipe. This will insure you get a great draft pull on the hose.
I would weld this small pipe on the exhaust once the exhaust gets past the tranny also. Otherwise I have always had trouble with the rubber hoses getting to hot and burning or made brittle after time and long hard/heavy hauls. The further back you weld the small pipe the better.
Good read here guys, as usual for this site though LOL; its always good reading. This makes a good and fun project too. Getting all the blow from going through the turbo is a great thing IMO. The mist of oil and smoke has to damage the turbo blades as well as slow things down somewhat...
I would weld this small pipe on the exhaust once the exhaust gets past the tranny also. Otherwise I have always had trouble with the rubber hoses getting to hot and burning or made brittle after time and long hard/heavy hauls. The further back you weld the small pipe the better.
Good read here guys, as usual for this site though LOL; its always good reading. This makes a good and fun project too. Getting all the blow from going through the turbo is a great thing IMO. The mist of oil and smoke has to damage the turbo blades as well as slow things down somewhat...
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From: Cleveland TN
Hey my reason for geting rid of it was not useing the orange hose and cast piece in my intake. but the real reason I vent it is i have a intercooler to install as soon as it get time and oil leaks through the boots and makes them soft and this causes them to blow off sometimes.
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Joined: Feb 2004
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From: Birmingham, AL
I can only see two reasons to do this mod. The first would be if you have an intercooler because the crank case vent will case a thin layer of oil to build up and line the inside of the intercooler and reduce it's efficiency.
The second would be to create a cleaner looking intake mod. One of the guys here posted pictures of his intake that was built from a 33 degree piece of 4" exhaust pipe. It ran all the way from turbo to filter. It was the nicest looking homebuilt that I have seen. If you are just adding a 45 on the end of the existing tubing on an old body style truck, I see no benefit to venting to the outside.
Anyone have a different opinion or some other benefit to doing this mod on an OBS truck?
Gene
The second would be to create a cleaner looking intake mod. One of the guys here posted pictures of his intake that was built from a 33 degree piece of 4" exhaust pipe. It ran all the way from turbo to filter. It was the nicest looking homebuilt that I have seen. If you are just adding a 45 on the end of the existing tubing on an old body style truck, I see no benefit to venting to the outside.
Anyone have a different opinion or some other benefit to doing this mod on an OBS truck?
Gene
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Joined: Feb 2004
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From: Birmingham, AL
Why not? It runs on oil and it was designed to run with the crankcase venting through the intake. I think the crankcase ventilation would function better aided by the suction from the intake, not unlike the PCV (positive crankcase ventilation) on a gasser. I can only see the two reasons I mentioned before for doing it, and they don't apply to 99% of us with OBS trucks.
Mods can be a good thing, but this one seems like a giant step backwards to me. What am I missing?
Gene
Mods can be a good thing, but this one seems like a giant step backwards to me. What am I missing?
Gene
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Postmaster
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From: Kearney, Nebr
I think I remember reading somewhere that introducing CCV gases back into the intake reduces intake flow? Somewhere close to 25%? Maybe? I could be blowing smoke here though...
Elder User
Joined: Feb 2004
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From: Birmingham, AL
That's a thought, although the 25% figure may well be blowing smoke. The crankcase vent is basically replacing clean "virgin" air with combustion blow by and a taste of oil. If the rate is as high as 25%, this would have to be the mod of the century.
Gene
Gene
Mountain Pass
Joined: Feb 2002
Posts: 224
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From: Northern IN
Yeh, a third reason is that the it often uses a good deal less oil with the mod. It seems that the turbo scavanges the oil vapor out of the CCV to the extent that with the mod my truck went from using a quart of oil every 1500 miles to a quart every 5000 miles.