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Blocking Rb25Det Pcv

Trozzle

By Trozzle,
in Engines & Forced Induction

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Trozzle Grand Master

Trozzle

Posted
  • Author
Posted

Yes, only an issue when there is a device metering the incoming air.

Do you have a breather from your crank case to the catch can? IMO this one is pretty critical if blocking the PCV valve and running at atmo system.

I don't have that breather if the question was for me.

Though yes, I can understand that it will have to BLOW the gasses through my proposed system rather than them being sucked out when the plenum is under vacuum. Not ideal, though will still work.

My ultimate reason for wanting to remove the system is that the fitting on the rocker cover is actually a suspect as well - the whole thing has a bit of play in it. Meh, whatever.

Cheers for the input though guys, at least I know I can give blocking it off a shot anyway without worrying about my crank case becoming a pressure bomb.

bubba Grand Master

bubba

Posted
Posted

There are passages in the sides of the block that are for blowby gasses to equalise with the head. The PCV valve is designed to draw these gasses out when the pressure in there is higher than in the intake manifold (i.e. under vacuum).

I'm at work and trying to focus on things completely not car related so my brain is struggling :P

IN the R32 Engine manual there is schematic of the blowby gas system, might help explain it a little :)

bubba Grand Master

bubba

Posted
Posted

I don't have that breather if the question was for me.

Though yes, I can understand that it will have to BLOW the gasses through my proposed system rather than them being sucked out when the plenum is under vacuum. Not ideal, though will still work.

My ultimate reason for wanting to remove the system is that the fitting on the rocker cover is actually a suspect as well - the whole thing has a bit of play in it. Meh, whatever.

Cheers for the input though guys, at least I know I can give blocking it off a shot anyway without worrying about my crank case becoming a pressure bomb.

Was mainly for gotRICE but she'll be right :)

It won't ever become a pressure bomb, the worst it could do it pump a heap of oil out the exhaust either via the valve stem seals or the turbo.

Trozzle Grand Master

Trozzle

Posted
  • Author
Posted

Was mainly for gotRICE but she'll be right :)

It won't ever become a pressure bomb, the worst it could do it pump a heap of oil out the exhaust either via the valve stem seals or the turbo.

I suppose I'll even notice the oil pressure go up on the stock gauge should this occur :P

cheers

Room42 Proficient

Room42

Posted
Posted

Years ago I had a Gemini that had a block filter thingy coming from the rocker cover to the air filter. I floored it at the lights and as the revs got up in second or 3rd (cant remember now, was a long time ago) the dipstick popped out and poured out all over the engine bay and the exhaust. Clouds of smoke everywhere and the guy I was dragging was grinning his head off.

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