PCV or breather???

riceslayer302 · Oct 21, 2008

im finishing up my stroker project, its a N/A 331 setup with 10:5:1 compression, .598 lift comp cam, AFR185 58cc, scorpion 1.6's, and an RPM II. i am not sure if i should run a breather cap or the stock PCV. i have deleted the smog pump, charcoal cannister, and egr... any suggestions???

stangzilla100 · Oct 21, 2008

i have a whipple SC on my s197. i did plumb in a catch can into the pcv system, but have since put in breathers instead. it runs fine, i cant tell any difference, but it does look cleaner and less stuff in the engine area. i like it better w/ the breathers.

HISSIN50 · Oct 22, 2008

The PCV is more efficient (active scavenging), so I'd keep it if you can. If it's overwhelmed and you don't wish to add a second PCV valve (etc), then do the breathers and ditch the PCV.

NIKwoaC · Oct 22, 2008

The nice thing about the PCV is that it runs the corrosive crankcase gasses back through the engine, they get burned, and dumped out with the exhaust (I'm sure you knew that, but I'm just reiterating). A breather just leaves them to hang around in your engine bay, and eventually deposits or drips form around and under the breather. The breather looks cool, but the PCV system works better and actually cleaner in the long run. That and, like stated above, the PCV system sort of "sucks" the gasses out of the crankcase, where a breather just lets them float out as they come, which can theoretically shorten the life of your oil.

That being said, there is nothing wrong with a breather, a PCV system is just a nicer option.

DocG · Oct 22, 2008

I've been wrestling with the same issue on my own lately. I bought it recently and the previous owner did the build.

It has the full stock PCV system still in place, but the passenger valve cover has a breather instead of being connected to the TB like the stock system. Seems to run ok like this. Still trying to research and decide if I should just leave it this way or somehow rig up a system similar to the stock system with the oil filler neck and tube going to the TB. My current valve covers do not have the filler neck.

I'd say to run a PCV setup if you can as well.

strtrcr50 · Oct 22, 2008

DocG2828 said:
I've been wrestling with the same issue on my own lately. I bought it recently and the previous owner did the build.

It has the full stock PCV system still in place, but the passenger valve cover has a breather instead of being connected to the TB like the stock system. Seems to run ok like this. Still trying to research and decide if I should just leave it this way or somehow rig up a system similar to the stock system with the oil filler neck and tube going to the TB. My current valve covers do not have the filler neck.

I'd say to run a PCV setup if you can as well.

I'd say you should get the right valve covers and run the system as it is designed to be run. Just make sure what ever valve covers you get clear your roller rockers. Although, I wonder if you'd be able to adapt this.
Trick Flow® Billet Oil Fill Kits: TFS-51400800 - trickflow.com

DocG · Oct 22, 2008

Probably could. I've looked into something like this as well...but can't tell if that is a PCV valve in there or not. The last thing I want is that opening to be a one way opening since my understanding of the crank ventilation is that it relies on that opening to be capable of two way air flow. Obviously something baffled would be nice to slow down oil splash.

strtrcr50 · Oct 22, 2008

That certainly looks like it has some kind of check valve in it.

DocG · Oct 22, 2008

strtrcr50 said:
That certainly looks like it has some kind of check valve in it.

Yeah that pic is actually from a motorcycle parts site....but I know I've seen similar ones with the hose nipple on them.

This seems to be a recurring topic though around these parts.

strtrcr50 · Oct 22, 2008

It gets even more fun if you have a blower..

85_SS_302_Coupe · Oct 23, 2008

My car leaks oil really bad out of the PCV/oil fill grommets on the valve covers. Anyone know why? I'm thinking of trying out a second PCV on the oil fill side?

DocG · Oct 23, 2008

85_SS_302_Coupe said:
My car leaks oil really bad out of the PCV/oil fill grommets on the valve covers. Anyone know why? I'm thinking of trying out a second PCV on the oil fill side?

Are the grommets any good? When I bought mine it was leaking pretty bad there too. The grommet on the breather was pretty chewed up. Popped in a replacement and it stopped.

Do you have any baffles under the valve covers?

From what I've read so far, I'd think you'd want to add another PCV on the drivers side, not the oil fill side. That side is generally thought to need the air to flow in both directions which will not happen with a PCV. Of course, I could be completely off base here.

The Tech Sticky up top has that good writeup on adding a second PCV valve if you so decide.

riceslayer302 · Oct 28, 2008

i think i have fixed the problem, i just ordered a steeda oil seperator kit for an 03-04 cobra and i will put that on with the pcv, see how that works

1991vert · Oct 28, 2008

riceslayer302 said:
i think i have fixed the problem, i just ordered a steeda oil seperator kit for an 03-04 cobra and i will put that on with the pcv, see how that works

could have just got one from home depot for like $10 instead of the $40-$50 steeda wants.

bentley429 · Oct 28, 2008

Dang yo should have asked me. 91 is right pretty cheap at homo depot but a -10 AN line to a catch can is the way to go imo.

vristang · Oct 28, 2008

Sam,
The separator is a step in the right direction, but it won't FIX the problem.

It will help determine if the oil really is entering the intake via the pcv though. And it will help quantify how much oil is being pulled into the intake......

Let me know what you get worked out man,
jason

SMOKEDYA · Oct 29, 2008

i'm going to use the stock system on mine also. but i bought the trick flow EFI intake so where do i get the screen at the rear of the lower intake or what is it called when i hit the parts store. peace

john

riceslayer302 · Oct 29, 2008

1991vert said:
could have just got one from home depot for like $10 instead of the $40-$50 steeda wants.

dang yo lol, well maybe steeda will send me a sticker with my purchase... thatd make it worth the extra 30 bucks... lol not

bentley429 said:
Dang yo should have asked me. 91 is right pretty cheap at homo depot but a -10 AN line to a catch can is the way to go imo.

here i was thinking i was being smart haha.

vristang said:
Sam,
The separator is a step in the right direction, but it won't FIX the problem.

It will help determine if the oil really is entering the intake via the pcv though. And it will help quantify how much oil is being pulled into the intake......

Let me know what you get worked out man,
jason

jason, i think i should be ok, i havent run the engine yet im just trying to stop the problem before i have it. i think its only a serious problem with FI cars but we'll see...

i'll keep everyone updated in here or my insanity (progress) thread

vristang · Oct 29, 2008

riceslayer302 said:
jason, i think i should be ok, i havent run the engine yet im just trying to stop the problem before i have it. i think its only a serious problem with FI cars but we'll see...

i'll keep everyone updated in here or my insanity (progress) thread

It isn't only forced induction.... and it should only be forced induction if the pcv system is setup WRONG.
That is why I have a thread on setting up a second pcv in the 'tech thread index' for a n/a stroker engine.............

If you haven't run the motor yet... I wouldn't worry too much.
Send the separator back...

PCV or breather???

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