Catch Can with or without PCV?
Thread Starter
Launching!
Joined: Mar 2009
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From: Chesterfield, VA
Catch Can with or without PCV? I installed the WS6 Store Catch Can on my 2001 WS6. The instructions say you can hook it up with or without the PCV valve inline so I left it out. Any downside to eliminating the PCV valve?
Thread Starter
Launching!
Joined: Mar 2009
Posts: 203
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From: Chesterfield, VA
No action on this thread but I thought I'd post my results to anyone interested. As I said , the instructions that came with my Catch Can from the WS6 store say you can use a PCV valve inline before the catch can or not use it- doesn't matter. I called them and they said "try it both ways and see what works best".
Well- I put the PCV valve inline and the catch can is now catching less than half of what it was before without the PCV valve. I'm more confused now. The objective is to keep oil out of the intake- so is the PCV valve simply acting as a check valve to limit how much oil makes it to the catch can in the first place or is more oil now getting into my intake with the PCV valve in place? And the fact that the instructions say it doesn't matter if you have a PCV valve inline or not seems ridiculous since there is a huge difference in how the system operates with and without it.
Well- I put the PCV valve inline and the catch can is now catching less than half of what it was before without the PCV valve. I'm more confused now. The objective is to keep oil out of the intake- so is the PCV valve simply acting as a check valve to limit how much oil makes it to the catch can in the first place or is more oil now getting into my intake with the PCV valve in place? And the fact that the instructions say it doesn't matter if you have a PCV valve inline or not seems ridiculous since there is a huge difference in how the system operates with and without it.
Yeah you need to search this topic there is pages and pages of info. But basically the PCV is suppose to close at wide open throttle so there would be less air traveling through the catch can and therefore less oil.
Thread Starter
Launching!
Joined: Mar 2009
Posts: 203
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From: Chesterfield, VA
Yeah, I'm quite aware of all of the write-ups on this forum and others. I read ALL of them. My point is that even the WS6 store who sells this particular catch can says it doesn't matter whether or not the PCV valve is inline. It obviously does matter.
LOL, I understand now, yeah I've read them all too, and from what I've read no one has a real definitive answer, just lots of good ideas and a few bad ones. Just gotta see which one works best for each car, I'm trying to figure out the same thing right now.
put the pcv after the catch can...
it will help reduce the amount of oil pulled through the system...
your catch can will catch all the oil that does come through....you just wont be emptying it out near as often
it will help reduce the amount of oil pulled through the system...
your catch can will catch all the oil that does come through....you just wont be emptying it out near as often
Thread Starter
Launching!
Joined: Mar 2009
Posts: 203
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From: Chesterfield, VA
I put the PCV before the catch can and the amount of oil it collects is far lower. Not following your logic on the PCV AFTER the catch can.
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PCV is acts like air restrictor....
putting it anywhere inline will help reduce the oil passing through...
putting it after will keep it from getting full of oil and needing to be changed...still allowing proper crankcase venting...
if it gets clogged with oil you get crankcase venting issues...which would happen if its before your catch can...
basically putting it after the catch can allows it to do the same job it has always done...without having to constantly replace the oil clogged pcv valve
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Thread Starter
Launching!
Joined: Mar 2009
Posts: 203
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From: Chesterfield, VA
PCV is acts like air restrictor....
putting it anywhere inline will help reduce the oil passing through...
putting it after will keep it from getting full of oil and needing to be changed...still allowing proper crankcase venting...
if it gets clogged with oil you get crankcase venting issues...which would happen if its before your catch can...
basically putting it after the catch can allows it to do the same job it has always done...without having to constantly replace the oil clogged pcv valve
putting it anywhere inline will help reduce the oil passing through...
putting it after will keep it from getting full of oil and needing to be changed...still allowing proper crankcase venting...
if it gets clogged with oil you get crankcase venting issues...which would happen if its before your catch can...
basically putting it after the catch can allows it to do the same job it has always done...without having to constantly replace the oil clogged pcv valve
PCV is acts like air restrictor....
putting it anywhere inline will help reduce the oil passing through...
putting it after will keep it from getting full of oil and needing to be changed...still allowing proper crankcase venting...
if it gets clogged with oil you get crankcase venting issues...which would happen if its before your catch can...
basically putting it after the catch can allows it to do the same job it has always done...without having to constantly replace the oil clogged pcv valve
putting it anywhere inline will help reduce the oil passing through...
putting it after will keep it from getting full of oil and needing to be changed...still allowing proper crankcase venting...
if it gets clogged with oil you get crankcase venting issues...which would happen if its before your catch can...
basically putting it after the catch can allows it to do the same job it has always done...without having to constantly replace the oil clogged pcv valve
Thread Starter
Launching!
Joined: Mar 2009
Posts: 203
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From: Chesterfield, VA
That's what I just did. Looking forward to the results after about 500 miles.
With the catch can and no PCV my system was sucking oil at a rate of a quart every 1500 miles- bad idea. With the PCV BEFORE the catch can that number went to about 4 ounces in 1500 miles. I'm guessing having the PCV after the catch can will be about.... no guesses, I'll post results after a bit of driving in this mode.
With the catch can and no PCV my system was sucking oil at a rate of a quart every 1500 miles- bad idea. With the PCV BEFORE the catch can that number went to about 4 ounces in 1500 miles. I'm guessing having the PCV after the catch can will be about.... no guesses, I'll post results after a bit of driving in this mode.
12 Second Club
Joined: Nov 2005
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well i have the same can and i have my pcv after the can.
i did go to the dealer and got the newer version of a gm pcv valve and it dont have the rattley check valve.
it looks like a standard pcv but theres no check valve theres just a tiny hole at the fat end and thats it.
so i guess the new updated valve it not suposed to close at all just restrict the air flow.
my set up seems to work perfect and i get no oil in my intake.
i did go to the dealer and got the newer version of a gm pcv valve and it dont have the rattley check valve.
it looks like a standard pcv but theres no check valve theres just a tiny hole at the fat end and thats it.
so i guess the new updated valve it not suposed to close at all just restrict the air flow.
my set up seems to work perfect and i get no oil in my intake.
just installed mine also...
T'd into the lines going from Valve Cover to Valve Cover on the rear, then into the catch can then into the Intake from the catch can w. a PCV inline between my catch can and intake..
new question should one turn his oil cap into a breater?
T'd into the lines going from Valve Cover to Valve Cover on the rear, then into the catch can then into the Intake from the catch can w. a PCV inline between my catch can and intake..
new question should one turn his oil cap into a breater?
TECH Apprentice
Joined: Sep 2009
Posts: 346
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if u'r stock pcv system uses one, why would u take it out just because u added a catch can?
i left mine in factory location, then ran lines just like normal, except with catch can in the middle.
everything works great for me!
but pcv valve after the can works too, either way
i left mine in factory location, then ran lines just like normal, except with catch can in the middle.
everything works great for me!
but pcv valve after the can works too, either way
Teching In
Joined: Dec 2009
Posts: 11
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From: WEST KY
i Have a 00 ss h/c/i longtubes undrive pully 6speed and i have oil smoke come out when im down in it and let off none while im driving normal should i try a catch can or someone told me to check the pcv the car and motor only have 44k so i wouldnt think i would have blowby what yall think?