323 GTX PCV Valve

[BremertonMSP]

hey guys for the air flow of the PCV valves...we are not talking about something that flows incrediable amounts of air. This just helps vent combustion gases out of your crankscase. This small amount of gas mixture slips past your piston rings. So trust me I seriously doubt it is a problem...can you say hose clamps to hold it in place?

Also, the PCV does not filter out any oil or sludge that may make it's way up to it. It's just a valve. When I was heavy into the 2.3L turbo Ford motors, the only good PCV valve to use was the Ford one. Any aftermarket valve would not hold up to boost. That is the main problem with PCV valves on boosted motors. They will allow pressure to slip by them and actually pressurize the crankcase causing power loss and possible damage.

It's interesting that Mazda didn't account for this and adapt the 323 PCV for the Mazdaspeed. I guess we need to add it to the list of things Mazda didn't account for.

 

[t3ase]

So since you have experience, would this be a recommended upgrade?

 

[LinuxRacr]

Here's a quote from another thread in the Mazdaspeed section about running 9-10 PSI:

PCV = Positive Crankcase Ventilitation. It routes blow-by gases that escape past the rings back into the intake system so they can be burned up in the combustion process. Without this ventilation system, pressure would build up in the crankcase, decreasing efficiency, and possibly breaking things.

In the old days, cars just had a downtube coming out of the engine block that vented blow-by to the atmosphere. Naturally, it was a huge source of pollution, and was eventually replaced by the PCV valve and it's associated intake plumbing.

 

[t3ase]

Well if it's for blowing off gases, wouldn't the stock large output diameter be more beneficial than a more restrictive one?

I'm still confused..

 

[MazdaspeedZOOM]

Well if it's for blowing off gases, wouldn't the stock large output diameter be more beneficial than a more restrictive one?

I'm still confused..

I agree on both accounts, I'm still confused yes, but then of course about the whole larger diameter flowing better. It is in my theory that a smaller pcv valve would cause greater pressure in the head because your not being able to releave as much of the air in the crank case when you go to a smaller valve. I don't know this is all just a theory, I guess in theory also that the amount of air being released is so small that even with a smaller valve it may not make a noticeable difference.

 

[Logan]

If everyone is concerned about their PCV valve, compare ours to one from, say, a WRX. That engine IS designed for a turbo, will that PCV valve fit? 2 litre turbo....
Any other 2 litre turbo's that anyone can think of that are "current" engines?

 

[Captain KRM P5]

i've been turboed for a while and never heard of / thought of doing this modification. i might email FM and see what thoughts they have on the subject.

 

[MazdaDryvr]

Has anyone checked with a Mazda Dealer?

 

[t3ase]

Has anyone checked with a Mazda Dealer?

Yes, I've checked with a dealership. They even questioned why it would make a difference, which is why I came back on and started asking questions.

 

[MazdaDryvr]

Has this become a philisophical matter then?

" There is no PCV valve"

 

[MSPDAVE125]

I think I am going to buy every 323 gtx PCV valve in the world and wait to see what happens!



Logan: The 4G63 Mitsu motor is a 2.0L Won't work though.



However this has turned into quite the discussion.

 

[02.5 P5]

was there ever any conclusion to this supposed problem with the PCV?

 

[t3ase]

I've put on 19k miles without changing my PCV valve out. No leaking, no blowing pcv valves, just a few other unrelated problems. I'd keep it the same.

 

[TheMAN]

he said "wrx motor"... that's a subaru EJ20

I think I am going to buy every 323 gtx PCV valve in the world and wait to see what happens!



Logan: The 4G63 Mitsu motor is a 2.0L Won't work though.



However this has turned into quite the discussion.

 

[fasteract]

The PCV valve on my Audi turbo (vented crankcase to intake manifold) had a one way valve which would prevent compressed intake air above atm pressure from reversing that path and "turbocharging" the crank. When it failed I would ooze oil out the head gasket seam since the crankcase was pressurized..I'm talking 20 psi of boost from my setup here ! Does the MSP even have this oneway set-up ? More correctly, since all PCV have a oneway valve set-up, I believe, ..does it have a stronger valve arrangement when compared to a N/A motor to resist the higher intake pressures a turbo produces ?

 

[t3ase]

That's what we're trying to figure out. Some people say no, it doesn't have any added strength.

 

[MazdaDryvr]

well, i got a 323 pcv valve just in case this ever gets resolved. (or before MSPDave buys them all)

 

[MazdaDryvr]

Bump

 

[03MSPRO]

why bump a thread 9 months old?
btw, the PCV valve is closed under pressure (boost).

 

[MazdaDryvr]

I bumped it because it wasnt resolved and I would like to have any new info. I figured after so long someone must have more info.