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S2 industries Air/Oil Separator


nismovzr2003

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 nismovzr2003']wouldnt the crank case get vacuum without the pcv anyway?

Only with the hoses recirced back to the intake, which is a constant low pressure/vacuum source. The faster you go the more it's sucking.

[quote name='nismovzr2003 said:

Wouldnt it just suck back thru the catch can as the line between the crank breather and catch can is not restricted?

I think it's about the air taking the path of least resistance. If you look at the OEM hose/fitting sizes, the biggest port/hose is between the PCV valve and crank outlet. With a smaller 10mm hose going to the intake. So when the PCV valve opens it will suck through the biggest straw, (pipe to crankcase).

Also with positive pressure in the crank case and negative pressure in the intake, the PCV will draw from the positive pressure side. Again the least resistance.

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 Rosssub said:
Only with the hoses recirced back to the intake, which is a constant low pressure/vacuum source. The faster you go the more it's sucking.

I think it's about the air taking the path of least resistance. If you look at the OEM hose/fitting sizes, the biggest port/hose is between the PCV valve and crank outlet. With a smaller 10mm hose going to the intake. So when the PCV valve opens it will suck through the biggest straw, (pipe to crankcase).

Also with positive pressure in the crank case and negative pressure in the intake, the PCV will draw from the positive pressure side. Again the least resistance.

So when the pcv is 'T'ed in between the crank breather and catch can, does the pcv need to be connected back into the manifold under the throttle body?

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 Rosssub said:
Yip, the PCV valve needs to feed straight into the intake manifold.

I'm running -10 line between the crank breather and catch can, can i use the same size line from the 'T' to the pcv on the manifold? Or do they need to be different sizes?

Cheers for all the help.

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Sweet. Not really sure how crucial the sizing is, but the OEM PCV valve needs a 16mm ID hose (5/8"). So probably good to use that size hose from T to PCV valve.

With the -10 having an ID of 12.5mm, you should end up with near OEM sized pipework.

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 Rosssub said:
Sweet. Not really sure how crucial the sizing is, but the OEM PCV valve needs a 16mm ID hose (5/8"). So probably good to use that size hose from T to PCV valve.

With the -10 having an ID of 12.5mm, you should end up with near OEM sized pipework.

Cheers for all the help.

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 Rosssub said:
Which manifold have you got? Be easiest to mount the PCV valve back into it's original hole, if it will still fit? Then a long hose to the new T at the crankcase breather.

still running v3/v4 manifold.

its a bit sill actually, although i need to run a -12 line 'T'ed from the crank breather back to the pcv in the manifold, the actual hole within the pcv is barely 7mm in diameter lol

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 nismovzr2003 said:
still running v3/v4 manifold.

its a bit sill actually, although i need to run a -12 line 'T'ed from the crank breather back to the pcv in the manifold, the actual hole within the pcv is barely 7mm in diameter lol

Would having the pcv as close to the crank breather instead of being mounted in the manifold generate more of a path of least resistance?

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 nismovzr2003 said:
Would having the pcv as close to the crank breather instead of being mounted in the manifold generate more of a path of least resistance?

Not sure if it would make any difference either way. Later models have the PCV valve mounted into the T piece near the crank outlet:

attachment.php?attachmentid=86580&stc=1&

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 Rosssub said:
Not sure if it would make any difference either way. Later models have the PCV valve mounted into the T piece near the crank outlet:

attachment.php?attachmentid=86580&stc=1&

Hmm interesting, the pcv hose to the manifold is smaller than the hose to the intake / catch can.

what year and model were these on?

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