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PCV capped off?


Forrest Gump 9

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Hello all

 

Is it possible to run the car with the PCV capped off?

 

I'm thinking about running this set up. From the engine block will run to an oil catch can with filter. The PCV will still attached to the intake manifold but will be capped off.

 

Anyone run this set up? Any adverse affect? Just trying to keep the damn intake manifold clean.

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Clean intake manifold is the goal. Oil vapor can't be good for combustion

 

The excess oil that goes through is definitely not good. I used to have oil in the intake and inside the blower before doing this. Oil mist/vapor brings down the octane rating too.

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I've seen it done four ways and some variations below:

 

1. PCV + additional line to a catch can vented to atmosphere

 

2. PCV + additional line to a catch can that is plumbed back into intake pipe pre-TB using the venturi effect (Speed density cars; I don't think you want to do this to a MAF car)

 

3. No PCV but separate lines off VC/crankcase to check valves in the exhaust to utilize the venturi effect.

 

4. No PCV but separate lines off VC/Crankcase to catch can vented to atmosphere. This may offer oil/fuel smell in or around the engine bay.

 

I like No 2 and 4 the most and have used them in various high horsepower application. V8 guys love option 3 but the valves clog up over time (moroso makes a kit)

 

The gain of the factory PCV is at low engine speeds as it draws the crankcase pressure back into the intake for better ring sealing and reduce stresses on engine seals (mains, cams, etc.). At higher engine load/speed it seals off that intake path.

 

In some turbo cases, people have even put auxiliary vacuum pumps on the crankcase to help alleviate this known crank case pressure. Ironically it has helped more than anticipated at times due to promotion of better ring sealing/combustion.

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