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How does the PCV work in boosted applications? 

 

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 Post subject: How does the PCV work in boosted applications?
Posted: Fri May 19, 2006 12:06 am 
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What happens to the PCV in forced induction set ups? I mean surely with the boost pushing against it, it won't open to vent, so that can't be good?

 

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Posted: Fri May 19, 2006 12:10 am 
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connect it pre turbo
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Posted: Fri May 19, 2006 12:31 pm 
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Blu Falc wrote:
connect it pre turbo


that makes sense lol.

 

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Posted: Fri May 19, 2006 12:34 pm 
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go an oil catch can with vent to atmosphere through a filter. not to sure how EPA like it but it works.

 

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 Post subject: Re: How does the PCV work in boosted applications?
Posted: Fri May 19, 2006 1:35 pm 
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twr7cx wrote:
What happens to the PCV in forced induction set ups? I mean surely with the boost pushing against it, it won't open to vent, so that can't be good?


Yeah, dont address this problem and you're pressurising the crankcase.

The blower just saw the connection at the TB blocked, then run the hose from the oil filler (used to run between the PCV vent on the filler to the fitting on the TB) to the air intake before the blower.

That was on the V8, not sure where the PCV vent is on an I6...

 

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Posted: Fri May 19, 2006 1:37 pm 
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concorde wrote:
go an oil catch can with vent to atmosphere through a filter. not to sure how EPA like it but it works.


The EPA wouldnt like it at all. Just vent it to the intake pre blower/turbo. It works and it's compliant.

 

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Posted: Fri May 19, 2006 1:58 pm 
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personally i wouldn't put the return pipe before the turbo, if you have enough blow-by to blow oil through (most reasonably worn engines do) you'll be spraying oil into the turbine thats spinning around 100,000rpm, it WILL damage blades and seals.

thats my opinion and experience.

 

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Posted: Fri May 19, 2006 7:47 pm 
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you guys seem to be forgeting that the PCV is a valve and it will close under boost. and operate the same as it always did. the only thing i would recomend is the use of the early type one, steel not plastic

the rocker breather at the back of the head is the one you need to worry about. thats a simple fix though, from the rocker cover to oil catch can to intake piping pre-boost (infront of turbo/blower

 

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Posted: Fri May 19, 2006 9:32 pm 
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concorde wrote:
personally i wouldn't put the return pipe before the turbo, if you have enough blow-by to blow oil through (most reasonably worn engines do) you'll be spraying oil into the turbine thats spinning around 100,000rpm, it WILL damage blades and seals.

thats my opinion and experience.


That and the fact that you will have a fair amount of oil build up in your intercooler if you run one.

tickford_6 wrote:
you guys seem to be forgeting that the PCV is a valve and it will close under boost. and operate the same as it always did. the only thing i would recomend is the use of the early type one, steel not plastic

the rocker breather at the back of the head is the one you need to worry about. thats a simple fix though, from the rocker cover to oil catch can to intake piping pre-boost (infront of turbo/blower


This sounds the most logical. But with the catch can hooked up to the rear breather will it ever fill up with oil or does it just catch oil vapour? I've seen catch cans that have a valve underneath so they can be emptied and I have also seen the odd catch can that has line going from the bottom of the can back to the sump, hence no need to empty the can as it is self emptying and will never over flow. Many ricers seem to dislike that idea cause they reckon the oil in the catch can is bad oil and is not allowed to return to the sump. Its just oil FFS.
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Posted: Fri May 19, 2006 9:42 pm 
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So your saying rerout the rear breather, but PCV is fine to be left?

 

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Posted: Fri May 19, 2006 11:19 pm 
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twr7cx wrote:
So your saying rerout the rear breather, but PCV is fine to be left?



change it to the EB style steel PCV, but yes it will not flow air into the engine.
the boost will close it

 

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Posted: Sat May 20, 2006 2:10 am 
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which will not allow the pressure to be vented as intended, get a non atmospherically venting catch can.
Although I very much doubt that the oil vapour being vented with do much damage to the turbine blades, factory's set up their cars like this so it can be that bad. It will however lower intercooler efficiency.
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Posted: Sat May 20, 2006 11:44 am 
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tickford_6 wrote:
you guys seem to be forgeting that the PCV is a valve and it will close under boost. and operate the same as it always did. the only thing i would recomend is the use of the early type one, steel not plastic

the rocker breather at the back of the head is the one you need to worry about. thats a simple fix though, from the rocker cover to oil catch can to intake piping pre-boost (infront of turbo/blower


when is the crank case going to pressurise and need to be vented? when the engine is running max boost, when the PCV needs to open, which is when the valve won't open becasue it has boost pressure pushing it closed.

Use a catch/breather can.

 

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Posted: Sat May 20, 2006 12:55 pm 
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Correct me if im wrong but cant you get an oil seperator?????
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Posted: Sat May 20, 2006 1:52 pm 
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also known as a catch can
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