S13 KA24DET correct oil catch can & PCV setup - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kenji001 · 07-21-2009, 05:20 PM

http://forums.nicoclub.com/zer...et-up
http://forums.nicoclub.com/zer...99790
Here is how you install a catch can,: CA18DE / CA18DET Forum: Nissan Forums / Infiniti Forums - NICOclub
http://forums.nicoclub.com/zer...age=1

I want to install Circuit Sports (CS) Mini Style Oil Catch Tank (250cc) to my KA24DET.

http://www.frsport.com/Circuit....html

Nissan 240SX Silvia S14 S15 SR20DET Air Intake Systems

http://cgi.ebay.com/ebaymotors...ories

After reading all those threads, I am still confused.

Could you confirm the following is the correct way to setup oil catch can & PCV?

PCV valve -> oil catch can -> one-way check valve -> pre-turbo intake

Basically in stock setup, PCV valve (one-way check valve) will vent oil/air to intake. Since there is oil in the blow-by, we want to use catch can to catch the oil but let air go through. This prevents dirty the air intake piping. The one-way check valve is to make sure the air will not go back to PCV valve under boost.

Am I understand it correctly?

Please bear with me as I am very new to turbo/PCV/catch can.

Thanks!

PinkPanther · 07-21-2009, 05:35 PM

Please do yourself a favor and DO NOT buy the circuit sports catch can. It is worthless; it leaks out of every fitting on it, and it has no internal baffles. I have one and I had to tear it apart and rtv all of the fittings on it and now it doesn't leak but it still doesn't really catch any oil vapors due to no baffling.

Kenji001 · 07-22-2009, 10:38 AM

I re-read the post PCV set-up: KA24ET / KA24DET Forum: Nissan Forums / Infiniti Forums - NICOclub

Do you think the followings will work with Circuit Sport Catch Can with 15mm (15mm = 3/8") connectors?
Brass Medium-Pressure Spring-Loaded Piston Check Valves Female X Female 3/8" (QTY 1)
McMaster-Carr
Barbed Tube Fittings male 3/8" to tube 3/8" ID (15 mm) (QTY: 2)
McMaster-Carr

I still have one more question. What do I do with valve cover breather connection?

I think other people do:
Tee connection between pcv valve and the valve cover breather -> oil catch can -> pre-turbo intake

According to WDRacing from Nico, this is wrong because the blow-by air/oil will go to back to the motor through the valve cover breather connection under boost. The catch can will do nothing in this case.

Kenji001 · 07-26-2009, 05:19 PM

After reading honda and other people regarding PCV setup, I think the best solution is to connect PCV valve and valve cover breather to exhaust. In case, you don't want to leak oil on the road/track, connecting a catch can in between PCV valve and exhaust is a good solution.

Pro:
1) No need to worry about vacuum leak/tuning (no unmeasured air goes after to MAF).
2) Will have good vacuum in boost and idle/non-boost situation.

Con:
1) More complicated and expensive

To most people, venting PCV and valve cover breather to atmosphere is good because no need to worry about tuning. And most people claim that will work but it is not the best solution.

07-21-2009, 05:20 PM	#1
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	S13 KA24DET correct oil catch can & PCV setup http://forums.nicoclub.com/zer...et-up http://forums.nicoclub.com/zer...99790 Here is how you install a catch can,: CA18DE / CA18DET Forum: Nissan Forums / Infiniti Forums - NICOclub http://forums.nicoclub.com/zer...age=1 I want to install Circuit Sports (CS) Mini Style Oil Catch Tank (250cc) to my KA24DET. http://www.frsport.com/Circuit....html Nissan 240SX Silvia S14 S15 SR20DET Air Intake Systems http://cgi.ebay.com/ebaymotors...ories After reading all those threads, I am still confused. Could you confirm the following is the correct way to setup oil catch can & PCV? PCV valve -> oil catch can -> one-way check valve -> pre-turbo intake Basically in stock setup, PCV valve (one-way check valve) will vent oil/air to intake. Since there is oil in the blow-by, we want to use catch can to catch the oil but let air go through. This prevents dirty the air intake piping. The one-way check valve is to make sure the air will not go back to PCV valve under boost. Am I understand it correctly? Please bear with me as I am very new to turbo/PCV/catch can. Thanks!

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07-21-2009, 05:35 PM	#2
PinkPanther Zilvia Junkie Join Date: Oct 2004 Location: Johnston City, IL Age: 35 Posts: 372 Trader Rating: (3) Feedback Score: 3 reviews	Please do yourself a favor and DO NOT buy the circuit sports catch can. It is worthless; it leaks out of every fitting on it, and it has no internal baffles. I have one and I had to tear it apart and rtv all of the fittings on it and now it doesn't leak but it still doesn't really catch any oil vapors due to no baffling.

07-22-2009, 10:38 AM	#3
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	I re-read the post PCV set-up: KA24ET / KA24DET Forum: Nissan Forums / Infiniti Forums - NICOclub Do you think the followings will work with Circuit Sport Catch Can with 15mm (15mm = 3/8") connectors? Brass Medium-Pressure Spring-Loaded Piston Check Valves Female X Female 3/8" (QTY 1) McMaster-Carr Barbed Tube Fittings male 3/8" to tube 3/8" ID (15 mm) (QTY: 2) McMaster-Carr I still have one more question. What do I do with valve cover breather connection? I think other people do: Tee connection between pcv valve and the valve cover breather -> oil catch can -> pre-turbo intake According to WDRacing from Nico, this is wrong because the blow-by air/oil will go to back to the motor through the valve cover breather connection under boost. The catch can will do nothing in this case.

07-26-2009, 05:19 PM	#4
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	After reading honda and other people regarding PCV setup, I think the best solution is to connect PCV valve and valve cover breather to exhaust. In case, you don't want to leak oil on the road/track, connecting a catch can in between PCV valve and exhaust is a good solution. Pro: 1) No need to worry about vacuum leak/tuning (no unmeasured air goes after to MAF). 2) Will have good vacuum in boost and idle/non-boost situation. Con: 1) More complicated and expensive To most people, venting PCV and valve cover breather to atmosphere is good because no need to worry about tuning. And most people claim that will work but it is not the best solution.