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PCV hose diameter?

I've tried to use the search extensively, and haven't found an answer. I'm upgrading to TopZ's A2A system soon, and am going to add a dual catch can system with

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Old 08-04-2019, 09:23 AM   #1 (permalink)
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Default PCV hose diameter?

I've tried to use the search extensively, and haven't found an answer. I'm upgrading to TopZ's A2A system soon, and am going to add a dual catch can system with breathers. I found a good-looking catch can from Damond Motorsports, and they have two models: one with 3/8" barbs, and the other with 5/8".

The only somewhat helpful info shows PCV hose sizes for our car in mm, but I'm still unclear. Also, the FSM is no longer online (at least where I can find it). Which would be the best match...3/8" or 5/8"?

My speed shop recommended using MickeyMouse catch cans, but I can't get them to respond to their web form for questions. Anyone have an alternative phone number for them?

Thanks!
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Old 08-04-2019, 10:02 AM   #2 (permalink)
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I've tried to use the search extensively, and haven't found an answer. I'm upgrading to TopZ's A2A system soon, and am going to add a dual catch can system with breathers. I found a good-looking catch can from Damond Motorsports, and they have two models: one with 3/8" barbs, and the other with 5/8".

The only somewhat helpful info shows PCV hose sizes for our car in mm, but I'm still unclear. Also, the FSM is no longer online (at least where I can find it). Which would be the best match...3/8" or 5/8"?

My speed shop recommended using MickeyMouse catch cans, but I can't get them to respond to their web form for questions. Anyone have an alternative phone number for them?

Thanks!
3/8” will be fine- just use a hose designed for pcv; that way it doesn’t collapse
Pretty sure oem is close to 3/8”(9.5mm)
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Old 08-04-2019, 10:06 AM   #3 (permalink)
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Also you can just remove one of the hoses from front of intake & slip an open end wrench over it (behind nipple) & size it that way....but I’m pretty sure it’s closer to 3/8”
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Old 08-04-2019, 11:03 AM   #4 (permalink)
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... Also, the FSM is no longer online (at least where I can find it). ...
https://www.nicoclub.com/FSM/370Z/Coupe/2015/

Link in my sig points to a directory a few levels up, if you want to explore.
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Old 08-04-2019, 06:29 PM   #5 (permalink)
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Thanks everyone for the help!
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Old 08-06-2019, 03:37 PM   #6 (permalink)
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OK, so, Damond will put together a package for me of what I need, but since they don't make a specific kit for the Z, I'll need to tell them what to include. To be on the safe side, how many feet of hose, and how many L's and/or T's should I tell them?

Thanks!
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Old 08-10-2020, 12:23 AM   #7 (permalink)
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oem, you should find that the PCV is at 3/8 ID and the valve cover breather is 5/8ID If you buy the CJ Motorsports valve delete, you will be running -8an 1/2ID to a catch can ( in most cases)
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