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Old 01-12-2007, 05:40 PM   #1
mxv
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Question pcv setup and breather

how should i be routing my pcv and breather? after i put in the new pcv and routed it to my intake manifold i thought for a second, if it sucks air out of the valve cover the idle will go crazy with a breather on the opposite side. so i should accually route the breather side to the intake manifold too eh? coudl i just bypass this and run a breather on both sides of the valve cover? thx alot

oh and my new pcv dosnt seem to even be a valve its open whether your sucking or blowing... shouldnt it shut if your blowing into it (aka turbo making boost pressure in the intake manifold)
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Old 01-12-2007, 06:43 PM   #2
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like normal. pcv should close blowing through it....sounds failed.
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Old 01-12-2007, 07:35 PM   #3
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Im kinda wondering the same thing, the BEGI IM doesnt have a place for the PCV and I am simply adding another breather in place of the PCV valve. I am going to see how it goes and if its not working out right then Ill just replumb the PCV back in by drilling and tapping for a barb fitting.
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Old 01-12-2007, 08:08 PM   #4
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no say it aint so Andy dont forsake VTA the pcv it is the only way
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Old 01-13-2007, 12:32 AM   #5
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pcv is brand new. i guess ill just put let each side of the valve cover vent and put caps on my taps in my intake manifold. oh well.
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Old 01-13-2007, 09:21 AM   #6
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Don't chicken out, dude. Your car will perform better and last longer with a correct PCV setup.
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Old 01-13-2007, 11:47 AM   #7
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Quote:
Originally Posted by mxv View Post
pcv is brand new. i guess ill just put let each side of the valve cover vent and put caps on my taps in my intake manifold. oh well.
i knew you where raedy to make big power.
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Old 01-13-2007, 06:11 PM   #8
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run the other side to betwwen the afm and turbo inlet..this will then let any air that is drawn in to be metered just like the factory NA setup.
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Old 01-13-2007, 07:00 PM   #9
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its gonna be squirted. i ended up putting a block off on the pvc valve and then put a breather on the other side and caped my intake manifold taps. i think this will also keep from any odd idle issues that may occur if my valve cover leaks air or somthing. just less issues and less work for me i like to simplify where i can.
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Old 01-14-2007, 02:19 AM   #10
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The pcv is there to help remove water vapor and other combustion byproducts that make it past the rings. Not running one is asking for longterm damage to your motor. There is a reason Mazda (and every other manufacturer) goes through the trouble of putting them in, as opposed to a couple of vents. Also, the MS couldn't care less if some air "leaks" in at idle, it doesn't meter air the way that the stock ecu does. Finally, if your valve cover leaks air you have bigger problems than idle issues.

Put this valve in the stock location, a small breather on the drivers side of the valvecover and you're done.
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Old 01-14-2007, 03:47 AM   #11
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definitly run a pcv valve, for the above mentioned reasons. there needs to be a small amount of vaccum and air flow in the block and so the PCV AND the other hose need to be used...another club member had oil smoke issues when he used a "breather" filter. i told him to put the hose back on, and guess what..... no more smoking......
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Old 01-14-2007, 10:48 AM   #12
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Right, because pressure builds up in the crankcase, and just venting them to atmo. is not always enough to rid the crankcase of pressure...hence plumbing the breather port to a constant source of vacuum.

This also helps the rings seal better which will give make the engine run better in the short-term also. On old drag cars and circle-track cars, they sometimes run vacuum pumps to get even more piston sealing and crankcase vacuum going. They see 2-3% more horsepower when running vacuum pumps (think 30hp on a drag engine).
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Old 01-14-2007, 12:45 PM   #13
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Yeah, I am going to replumb my PCV back into my system because you guys convinced me to.
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Old 01-14-2007, 01:09 PM   #14
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heres a picture i found with a costume intake mani.i know the guy who built it is on here,somewhere.
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pcv setup and breather-maz4.jpg  
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Old 01-14-2007, 02:12 PM   #15
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if you say so. i guess i need to figure outa way to make my valve a 1 way valve... i dont see way they would even call it a valve if its not a 1 way, then its not a valve.



so that right?
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Old 01-14-2007, 02:34 PM   #16
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Looks right. You should be able to suck air through the hose, but when you blow into the hose it should block flow. Put a clamp at the intake manifold end also when you are done testing.
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Old 01-14-2007, 03:26 PM   #17
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yep i am just cutting hoses to length right now. guess ill return it for a 1 way. guess it was defective.
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Old 01-16-2007, 04:58 PM   #18
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Quote:
Originally Posted by mxv View Post
if you say so. i guess i need to figure outa way to make my valve a 1 way valve... i dont see way they would even call it a valve if its not a 1 way, then its not a valve.



so that right?

Clean engine bay sir.
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Old 01-16-2007, 06:17 PM   #19
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Quote:
Originally Posted by 4sfed5 View Post
run the other side to betwwen the afm and turbo inlet..this will then let any air that is drawn in to be metered just like the factory NA setup.
wouldnt that be after the afm and thus be not metered? or am I reading that wrong like 12 times. (Im hooking up my breather and pcv tonight : ) )
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Old 01-16-2007, 07:11 PM   #20
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Well, yes, it is after the meter, thus it's already metered. The air from the crankcase comes from air sucked into the engine...it's not magically made out of thin...uh...air
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