CCV Modification
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
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From: SoCal
CCV Modification
While looking through the internet I've noticed some people have re routed their CCV to vent to atmosphere. Is this a good idea?
A little context- I've been having issues with oil leaks and the shop that has gone through everything is suggesting a new CCV box. The oil pan was removed (with engine out upside down and sealed with Rotorcraft RTV) and they just found a leak at the rear corner drivers side.
My thought is if there is a build up of pressure in the crank case and there's no benefit to the CCV venting back into the turbo, wouldn't the modification not only relieve the crankcase pressure reducing leakage, but possibly keep the engine from getting oily especially the intercooler system?
A little context- I've been having issues with oil leaks and the shop that has gone through everything is suggesting a new CCV box. The oil pan was removed (with engine out upside down and sealed with Rotorcraft RTV) and they just found a leak at the rear corner drivers side.
My thought is if there is a build up of pressure in the crank case and there's no benefit to the CCV venting back into the turbo, wouldn't the modification not only relieve the crankcase pressure reducing leakage, but possibly keep the engine from getting oily especially the intercooler system?
Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
It will keep oil out of the pipes and intercooler but how it's plumbed in the itnake it actually draws pressure out of it more then it would just vented to atmosphere. I would not vent it to atmosphere if it were me.
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
When you explain it that way, it only makes sense to keep it factory. Having a positive pressure condition in the crankcase doesn't sit well with me when my first priority is leak prevention and reliability. Thank you for the further education...
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
I wonder how difficult and effective it would be to rig up a catch can before dumping into the air intake. Might need to dust off my redneck engineering degree for a little R&D on that one.
Cargo Master
Joined: Apr 2022
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I've thought about doing one. I would probably use the mishi moto catch can. It's designed for diesels and has big fittings for lots of flow. They sell it as a kit for 6.0s and 6.4s I believe. Don't think they do a kit for 7.3 but you can buy just the catch can and shouldn't be hard to do. The cheap Amazon ones I've heard don't flow enough because the small fittings.
Lead Driver
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From: Bahstun
Lead Driver
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From: Oologah, OK
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FTE Chapter Leader
Joined: Jan 2005
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From: Henderson, NV
I ran the vent-to-atmosphere for awhile. Reverted back to vent-to-intake because 1) the stink was awful and 2) it left a greasy mess where it vented.
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
The shop called today to let me know that the Morosso oil pan gasket and the CCV box arrived and confirmed my appointment Monday for installation.
I decided to stay with the factory Ford configuration. Engineers far smarter than I designed it that way for good reasons so who am I to argue. I will say that the “can” mentioned by Knottyrope above and venting back to the CCV box idea is worth considering. The CCV box theoretically would last the lifetime of the engine and eliminate the oil in the intake.
Sure IH vents to the atmosphere on off-road vehicles and equipment and that’s ok. They can have oil leaks and gases and not make a mess in driveways or worry about odors. Completely different applications from a road warrior and I’ll venture to say irrelevant other than the basic engine components.
There’s my two cents…
Thank you all for your wise words. As always, FTE ROCKS!
I decided to stay with the factory Ford configuration. Engineers far smarter than I designed it that way for good reasons so who am I to argue. I will say that the “can” mentioned by Knottyrope above and venting back to the CCV box idea is worth considering. The CCV box theoretically would last the lifetime of the engine and eliminate the oil in the intake.
Sure IH vents to the atmosphere on off-road vehicles and equipment and that’s ok. They can have oil leaks and gases and not make a mess in driveways or worry about odors. Completely different applications from a road warrior and I’ll venture to say irrelevant other than the basic engine components.
There’s my two cents…
Thank you all for your wise words. As always, FTE ROCKS!
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,353
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From: Lake Hartwell, GA
Good choice. More often than not, people that have accomplished the CCV mod in some way or another go back to the OEM configuration. To each their own.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
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From: Springfield, PA
Years ago I made a steel catch can that I mounted below the drivers floorboard, outboard of the frame. It can hold at least a gallon of oil, with a clear tube mounted on the end as a level indicator and a drain line. I turned the doghouse around and ran the line to the catch can, and then another line back up to the intake. Inside the can I stuffed a bunch of SS steel wool around the inlet, with a short dividing wall to direct any fluids to the bottom, while gases can go back up. I was concerned that I had excessive blow by or something, but after years I finally drained it once this summer, just a little over a quart in it. I thought I wrote about it here, but I can't find the thread.
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Laughing Gas
Joined: Sep 2013
Posts: 1,209
Likes: 171
From: SoCal
Also here in the Land of Fruits & Nutz, our emissions laws are very strict to the point that a catch can would not pass a smog test.
Tuned
Joined: Oct 2020
Posts: 418
Likes: 178
From: Piedmont of N.C.
I vented mine to atmosphere, so far no oil spots on my concrete. Does smoke roll out from underneath, yes, but nothing crazy or impulsive. I like the idea of not running oil through my turbo and charge air cooler decreasing efficiency of the charge air cooling system. To each his own though. I did loop my tube up the fire wall above the booster to try and keep the oil in the tube where it can drain back into the head.
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