PCV on 7.3
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Mountain Pass
Joined: Dec 2022
Posts: 152
Likes: 56
PCV on 7.3
Like a lot of 7.3 owners here, I get kinda tired or the oil in the intake system. Replacing the PCV valve in my daughter's Toyota, it occurred to me, "why not put a PCV valve on my 7.3" ? One could put it on top of the "dog house" assembly. Thougths?
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
A PCV is just a check valve that allows airflow towards the engine.
I don't think it would prevent the oil from doing the same as it already is.
Many people divert the breather tube into a catch can to prevent the oil from entering the intake.
I don't think it would prevent the oil from doing the same as it already is.
Many people divert the breather tube into a catch can to prevent the oil from entering the intake.
Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
Someone here (Y2K, Sous, etc.) has done some serious research around this issue and the design details of the 7.3 PCV system. Search... search... the information is available to supply lots of food for thought on this issue. If I find it before you do, I'll post a link.
What I was remembering was Y2K's Post (#61) in the thread linked here >> [ https://www.ford-trucks.com/forums/1610743-ccv-mod.html ].
There are several good threads on the topic.
What I was remembering was Y2K's Post (#61) in the thread linked here >> [ https://www.ford-trucks.com/forums/1610743-ccv-mod.html ].
There are several good threads on the topic.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
A PCV system requires engine vacuum to function.
The crankcase vent on the 7.3L requires no vacuum to operate and uses the differential pressure in the pre-turbo intake tract to vent crankcase pressure back into the combustion chamber.
A gasoline PCV system uses intake manifold vacuum to actively suck crankcase vapors into the intake sysem to be burned. Since a diesel has no intake vacuum (and in our case manifold PRESSURE with turbocharging), there is no way an actual PCV system would work.
The crankcase vent on the 7.3L requires no vacuum to operate and uses the differential pressure in the pre-turbo intake tract to vent crankcase pressure back into the combustion chamber.
A gasoline PCV system uses intake manifold vacuum to actively suck crankcase vapors into the intake sysem to be burned. Since a diesel has no intake vacuum (and in our case manifold PRESSURE with turbocharging), there is no way an actual PCV system would work.
Lead Driver
Joined: Apr 2016
Posts: 7,205
Likes: 1,340
From: Bahstun
PCV needs constant vacuum to work
turbo inlet dont do much for that until air filter gets dirty
catch cans over fill and long hose is just another mess to deal with
a couple of moist road salt air runs and your IC and piping is going to get some corrosion on the inside which cant be that good for the engine
turbo inlet dont do much for that until air filter gets dirty
catch cans over fill and long hose is just another mess to deal with
a couple of moist road salt air runs and your IC and piping is going to get some corrosion on the inside which cant be that good for the engine
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,111
Likes: 4,716
From: Henderson, NV
Think of the oil mist in the intake as lubrication for the compressor wheel's fins for when they contact the compressor housing.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
After many years of dumping crankcase fumes to the street via a vent tube, I reconnected my vent to factory location because I grew tired of smelling the fumes every time I pulled up to a stoplight with the windows down on a nice day. Plus the truck always had "smoke" coming out from under the chassis from the vent pipe. Just wanted to clean things up.
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Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
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