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Old February 9th, 2010, 07:43 AM   #1
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PCV system question


About to button my motor back up.

Made the mistake of buying valve covers with a spot for a PCV valve on the driverside valvecover.....

So it would be simple, and cost a hole $3 to run a hose from the upper intake to a pcv in the valve cover, and run my normal pcv to the back of the intake. running 2 pcv valves.

now would this make the motor suck up more oil into the intake? or any odd effects?

or would the motor's PCV system work better since it will live in higher RPM's and a "higher performance" area then the stock PCV system was designed for?



OR I could just plug the valve cover up, and run the OEM pcv to the back of the intake and thats it.



what's your thoughts?

thanks in advance.
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Old February 9th, 2010, 11:15 AM   #2
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its honestly ur choice, u don want some sort of evac u could just put a twist cap on ur valve cover, u could tee off ur pcv line and run 2 pcvs. or u could go bad ass and pull ur crank case gases through your exhaust, which is alot more work, but efficent and the definition of joe kick ass, or u could just put a breather on it on, either way you at least 1 vent on ur car... i personally am running 2 pcv valves w/ 3/8 hose to a tee to my carb. the valve covers i got came w/ nice chrome twist caps w/ a pcv hole in em.
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Old February 9th, 2010, 04:43 PM   #3
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hmm, ive always heard running a breather will create a vacuum leak?

Im just not sure how the system works, I know it pulls in a little oil, and the motor eats it up, i just dont want this thing sucking up a ton of oil or causing other random issues.
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Old February 9th, 2010, 05:09 PM   #4
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Originally Posted by Jmanspike View Post
its honestly ur choice, u don want some sort of evac u could just put a twist cap on ur valve cover, u could tee off ur pcv line and run 2 pcvs. or u could go bad ass and pull ur crank case gases through your exhaust, which is alot more work, but efficent and the definition of joe kick ass, or u could just put a breather on it on, either way you at least 1 vent on ur car... i personally am running 2 pcv valves w/ 3/8 hose to a tee to my carb. the valve covers i got came w/ nice chrome twist caps w/ a pcv hole in em.
Could you please not use 'text-speak' it does not belong on a tech forum, Thanks
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Old February 9th, 2010, 11:42 PM   #5
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Originally Posted by Rusty105 View Post
Could you please not use 'text-speak' it does not belong on a tech forum, Thanks
u can blo mah :p3n15!
...on secont thought dont do that, i might like it, then itll be weird and not funny....

anyhoo, runnin a breather on ur valve covers wont give u vac leak. u only have vacuum through the intake manifold, and any hoses connected to ur vacuum. if ur eatin sum earl" change over 2 breathers, or use some baffled valve covers that keep oil from gettin sucked up....
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Old February 9th, 2010, 11:47 PM   #6
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my pcv sucks up carbon and makes my throttle plate stick. I am using a little trick I learned from my pops that involves putting one of those see through fram fuel filters in line. Problem solved and no more stickeyness.
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Old February 10th, 2010, 12:18 AM   #7
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Your PCV will be pulling unmetered air into the intake through the breather (vac leak). If you have EFI, run either a PCV or a breather, not both.
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Old February 10th, 2010, 12:33 AM   #8
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Originally Posted by jessemachone View Post
my pcv sucks up carbon and makes my throttle plate stick. I am using a little trick I learned from my pops that involves putting one of those see through fram fuel filters in line. Problem solved and no more stickeyness.
The PCV air enters the intake on the engine side of the throttle plate. Are you sure your source for build up is not the line from the valve cover to the throttle body which is before the throttle plate?
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Old February 10th, 2010, 03:17 PM   #9
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Originally Posted by nolife View Post
Your PCV will be pulling unmetered air into the intake through the breather (vac leak). If you have EFI, run either a PCV or a breather, not both.
yea, thats what I thought.

any thought if two PCV's will help or hurt?
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Old February 10th, 2010, 10:56 PM   #10
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Originally Posted by nolife View Post
Your PCV will be pulling unmetered air into the intake through the breather (vac leak). If you have EFI, run either a PCV or a breather, not both.

true, didnt think of that, although i run a carb...
1's fine, 2's better, although 1 is sufficent (did spell that right?) pcv dont give u horses, as long as u run 1 ull be fine.
also, im not 2 familliar w/ the fuel injected intakes, isnt there like a filter screen that keep oil from gettin in the intake????
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Old February 10th, 2010, 11:01 PM   #11
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Originally Posted by Jmanspike View Post
true, didnt think of that, although i run a carb...
1's fine, 2's better, although 1 is sufficent (did spell that right?) pcv dont give u horses, as long as u run 1 ull be fine.
also, im not 2 familliar w/ the fuel injected intakes, isnt there like a filter screen that keep oil from gettin in the intake????
Actually, many of the big racers run vaccum pumps to a pcv on both valve covers to remover crank pressure in the belief that the pressure in the block is resistance against the pistons. I guess it's proved to work.
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