pvc?

[esahuque]

below is how a pvc system is setup on a stock Ka. When I went turbo I put a filter on the valve cover instead of putting a line between the maf and turbo because i didn't have a nipple to hook a line to on the intake pipe. after looking at it for a while and reading how the pvc system works, I started to think. If you have a filter on the valve cover instead of a line from the intake (as many people do) wouldn't it allow "unmetered" air at idle and low throttle to be sucked in to the intake manifold through the pvc?

[kouki_hmongster]

Check this out.

zer...et-up

You should connect the hose from the vavle cover to the turbo intake pipe.

[esahuque]

Check this out.

zer...et-up

You should connect the hose from the vavle cover to the turbo intake pipe.

thanks for the info, but that doesn't answer my question.

[kouki_hmongster]

i doubt that it will effect if it is metered or unmetered. i ran my turbo set-up w/ out hooking it up to maf(didnt have nipple) and that didnt make my ride stall during shift. pretty much the hole from the vavle cover is trying to get fresh air into the vavle cover which will go through the cranck case. from the vacuum on the intake manifold it will pull blowby gas into the combustion chamber before it can go back into the oil preventing it from contaminating the oil. I'm pretty sure the reason why so many people have it hooked up to the intake pipe before the maf isnt because it is metered air. it's more convienent than trying to put a hose in between the maf and the filter. also putting a breather filter on the vavle cover wont be as good as getting air from intake. also there isnt any vacuum on the hose that goes from the vavle cover to turbo intake pipe, so that shows that it's a source for clean air for the positive crankcase ventilation. usually if you have stalling problem it's due to bov and that doesnt have anything to do with PCV.

I've done a lot of reading on this subject, but if i'm wrong correct me.


Modified by kouki_hmongster at 1:59 PM 11/17/2008

[esahuque]

i doubt that it will effect if it is metered or unmetered. i ran my turbo set-up w/ out hooking it up to maf(didnt have nipple) and that didnt make my ride stall during shift. pretty much the hole from the vavle cover is trying to get fresh air into the vavle cover which will go through the cranck case. from the vacuum on the intake manifold it will pull blowby gas into the combustion chamber before it can go back into the oil preventing it from contaminating the oil. I'm pretty sure the reason why so many people have it hooked up to the intake pipe before the maf isnt because it is metered air. it's more convienent than trying to put a hose in between the maf and the filter. also putting a breather filter on the vavle cover wont be as good as getting air from intake. also there isnt any vacuum on the hose that goes from the vavle cover to turbo intake pipe, so that shows that it's a source for clean air for the positive crankcase ventilation. usually if you have stalling problem it's due to bov and that doesnt have anything to do with PCV.

I've done a lot of reading on this subject, but if i'm wrong correct me.



Modified by kouki_hmongster at 1:59 PM 11/17/2008

I'm not having stalling problems, stalling problems are usually do to rich conditions anyway. my idle is just very lean, this is my second motor and I have an enthalpy tune ecu and since day 1 I've always had a very lean idle. I have to turn my safc up to like +34 just to get it to idle at around 15.2

[kouki_hmongster]

whenever you hook it up then let us know if it changes your afr while idle. So if you have metered air going into the valve cover then that means that you should be rich since not all the metered air is going into the engine. Meaning that if it rich out the mixture then you shouldnt need the afc fuel correction, because your car was lean at idle w/ just using the breather filter. That actually make sense if it works. so try it out and let us know.
Modified by kouki_hmongster at 9:38 PM 11/18/2008

[480sx]

below is how a pvc system is setup on a stock Ka. When I went turbo I put a filter on the valve cover instead of putting a line between the maf and turbo because i didn't have a nipple to hook a line to on the intake pipe. after looking at it for a while and reading how the pvc system works, I started to think. If you have a filter on the valve cover instead of a line from the intake (as many people do) wouldn't it allow "unmetered" air at idle and low throttle to be sucked in to the intake manifold through the pvc?

The answer to your question is yes, the PCV allows for unmetered air to enter the system. The ECU is tuned around it. When you disable this system you mess with your ECU, i believe its contributing to a stalling problem i have. This is just a theory of mine though. The best thing you can do is buy a hard core McMaster one way check valve so that this system is still intact and can function under any levels of boost. There was a thread about it somewhere in Ka-T.

[spank044]

First off it is a PCV valve, positive crankcase ventilation. The best way to run an engine is with vacuum in the crankcase.

Easiest way to remedy this is to buy a catch can and hook both the PCV and valve cover to the inlet using a T fitting to hook them together. Then hook the outlet to the intake pre maf. That way any blow by of oil and combustion gases goes through the catch can (instead of the combustion chamber) then into your engine as clean metered air.

[Daily Driven 240]

i was think about how i was going to run my PCV system the other day and i came up with this simple way of keeping it working like stock wich is good but without getting oil up in my intake manifold, intake ports of the head and the intake valves to gum everything up.

here's my little diagram.

[kouki_hmongster]

i was think about how i was going to run my PCV system the other day and i came up with this simple way of keeping it working like stock wich is good but without getting oil up in my intake manifold, intake ports of the head and the intake valves to gum everything up.

here's my little diagram.

you would be better off using an air/oil separater from air compressor. homedepot sell some. they can handle the pressure and the temp so it would be fine. also ka's pcv vavle are known to leak under boost so something like a check vavle would be great. just install one anywhere in between the intakemanifold and the air/oil separater. also you can put a catchcan in between the pcv vavle cover breather and the turbo intake pipe.

[Daily Driven 240]

Hey thanks for the tip i hadn't thought of the check valve idea but thats smart im going to use that thanks.

[SullivanRacing06]

i elimnated both pvc and valve cover hoses on my rb26, blocked off the pcv, and ran both the valve cover breather hoses to dual catch cans, n vented the catch cans the the atmosphere

[zapracing]

the dyagram on the intake side should have arrows going bothways b/c that system provides crankcase and valve cover ventalation for blowbye but i would add a catch can on both sides of the system