Question About PCV Valves
#1
Evolving Member
Thread Starter
Question About PCV Valves
I have a cracked evo viii valve cover that I want to replace.
The only decent priced one I can source does not use the pcv valve I am currently using.
It uses the USDM one (the left one on the attached image)
My questions are,
Is it okay to use the usdm pcv valve if I get a valve cover that fits it?
and what are the differences between the two (apart from how they look)?
and why would mitsubishi use two different pcv valves for the jdm and usdm models?
thanks in advance
The only decent priced one I can source does not use the pcv valve I am currently using.
It uses the USDM one (the left one on the attached image)
My questions are,
Is it okay to use the usdm pcv valve if I get a valve cover that fits it?
and what are the differences between the two (apart from how they look)?
and why would mitsubishi use two different pcv valves for the jdm and usdm models?
thanks in advance
#3
Account Disabled
Some (stock and metal) PCV valves, you can blow through both ways.
No good for a turbo.
The proper ones only flow one way.
The parts shops won't have a clue.
Easy to test........if you don't bother........you'll never know.
No good for a turbo.
The proper ones only flow one way.
The parts shops won't have a clue.
Easy to test........if you don't bother........you'll never know.
#4
Evolving Member
Thread Starter
Mine blows both ways.. any suggestions on what to do?
#6
Evolving Member
Thread Starter
#7
Evolving Member
iTrader: (8)
Yes, a working PCV valve for the Evo should only allow air to flow away from the valve cover.
Any air coming through the PCV under boost is essentially a boost leak. That air is not going into the combustion chamber, it's going into the head and pressurizing the head does not help with power delivery. Or anything, really.
Any air coming through the PCV under boost is essentially a boost leak. That air is not going into the combustion chamber, it's going into the head and pressurizing the head does not help with power delivery. Or anything, really.
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TariqEvo (Jul 17, 2017)
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#8
Evolving Member
Thread Starter
I was testing it wrong. I was blowing and then pulling.
Instead of chucking it and blowing one side
thanks anyways man. Atleast im sure I have a working pcv valve.
but i still got a ton of blow by for some reason. Need to do a compression test soon.
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