HOW TO: Vent your crank case. Attn: FI members! - Page 2 - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #11 of 34 (permalink) Old 05-19-2010, 11:05 AM
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Hi Willy been following your catch can development ( with Kam ) and my research has come up with the same system as you have but with another check valve between the "T" and the intake. My reasoning was for the plenum to draw using vacuum at idle and low rpm and the intake to draw at higher rpm. So to avoid unmetered air and to safe guard against backfire i came up with the 2 check valves. This may explain your lower vacuum. I like your 5/8-3/8 reduction method. I'm going with a HKS S/C. Do you recall the part number for the check valve?

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post #12 of 34 (permalink) Old 05-19-2010, 02:23 PM Thread Starter
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Hi Willy been following your catch can development ( with Kam ) and my research has come up with the same system as you have but with another check valve between the "T" and the intake. My reasoning was for the plenum to draw using vacuum at idle and low rpm and the intake to draw at higher rpm. So to avoid unmetered air and to safe guard against backfire i came up with the 2 check valves. This may explain your lower vacuum. I like your 5/8-3/8 reduction method. I'm going with a HKS S/C. Do you recall the part number for the check valve?
Where would you put the other check valve? (note the arrow on my diagram is actually drawn backwards)
...putting a check valve between the can and the turbo in take would allow air to but sucked only into the intake and not pushed back out. This should be superfluous, though, because the turbo intake is always under vacuum and never making positive pressure that would push back into the can, and thus need to be blocked. The plenum DOES make positive pressure under boost, so it must have a check valve...
note, there is no check valve in the stock set up for this reason...


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post #13 of 34 (permalink) Old 05-19-2010, 06:32 PM
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Thats what we need, the intake/plenum doing the work of evacuating the crankcase of all the blow by gases at all of the rpm range. The plenum (vacuum) at low rpm and the intake at higher rpm ( as more air rushes by the opening it draws the gases through CC. So we don't want air being forced back int the CC at any time , hence my reasoning for the check valve between the CC and the intake.)
I'm hoping the CC will be efficient at this point and doing it's job not letting any oily contaminates into our intakes and IC.

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post #14 of 34 (permalink) Old 05-19-2010, 08:54 PM Thread Starter
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Thats what we need, the intake/plenum doing the work of evacuating the crankcase of all the blow by gases at all of the rpm range. The plenum (vacuum) at low rpm and the intake at higher rpm ( as more air rushes by the opening it draws the gases through CC. So we don't want air being forced back int the CC at any time , hence my reasoning for the check valve between the CC and the intake.)
I'm hoping the CC will be efficient at this point and doing it's job not letting any oily contaminates into our intakes and IC.
That is exactly what is happening with my set up... I have 2 more check valves sitting in my floor, but there should be no reason to put another one in... the turbo intake doesn't "boost" so to speak, it cannot force pressure back into the crankcase like the plenum can, so there's not need for a check valve on it...
I know it's confusing, I will try to draw separate diagrams for airflow under idle (plenum vacuum) and airflow under boost (turbo intake vacuum)


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post #15 of 34 (permalink) Old 05-19-2010, 09:48 PM
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Ah well, i guess all we can do is go with our strategy and monitor the CC and the IC. At the very least both approaches are relieving the crankcase of any piston ring blow by.
Do you have that part number handy?

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post #16 of 34 (permalink) Old 05-19-2010, 10:02 PM Thread Starter
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This is the one I used...

1996 Nissan Pathfinder Brake Booster Check Valve - OES Genuine


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post #17 of 34 (permalink) Old 05-20-2010, 02:41 AM
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Thanks for that.

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post #18 of 34 (permalink) Old 05-20-2010, 01:51 PM
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Very nice write up with good pic's as this should help out quite a few people including me as im gonna do this too.......thanks.

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post #19 of 34 (permalink) Old 05-21-2010, 05:39 PM Thread Starter
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Here are some more complete diagrams I drew up... I hope this clears up any confusion with the check valve(s)...





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post #20 of 34 (permalink) Old 05-21-2010, 06:18 PM
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Hey Willy great diagrams they are great way to visualise , i did the same. What i'l do is the same and monitor the intake hose. I'm going with a HKS S/C.
How is your CC setup running has it collected anything? Your motor is built so i imagine its running without any or much blow by.
Was the valve the right diameter for the 3/8 hose you used? Just as a side note Nissan Australia quoted me $66.00 for the check valve! Thats gouging!!!

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