DIY Catch Can - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

General Miata Chat A place to talk about anything Miata

LinkBack Thread Tools
Old 05-25-2016, 08:55 PM   #1
Junior Member
Thread Starter
Join Date: Jan 2016
Location: Allen, Texas
Posts: 65
Total Cats: 2
Default DIY Catch Can

Hey guys. I have a small question regarding a DIY catch can. Here is the link to a how-to on the DIY. Now I won't be venting to atmosphere. I've heard it can dirty up the engine bay and fail a visual emissions check.

Now the way I understand it is that the catch can connects between the intake manifold and valve cover port on the intake side. The "In" port on the catch can connects to the valve cover, and the "out" will either VTA or connect to the intake manifold. That part is easy. What about the valve cover port on the exhaust side? The one that connects to the intake crossover tube? Since I'm ditching the intake for a DIY setup, do I just run breather filter on there? Some people say that this makes the catch-can useless. Other's seem to run this type of setup where I'm guessing the exhaust side and intake side both flow into the "In" port on the catch-can. In order to do that setup I'd have to use a T Fitting on the "In" port of the catch can to connect both hoses correct?

Am I just crazy and each of these setups will work fine? I'm on a basically stock engine with an Enthuza XR Lightweight muffler. Plans are for a N/A 949racing setup down the road so no crazy pressures from boosting. I'm just a little confused as there seems to be a lot of contrary information for such a simple simple project.
crispyBYM is offline   Reply With Quote
Old 05-26-2016, 10:20 PM   #2
Hug Life
iTrader: (3)
Monk's Avatar
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,803
Total Cats: 494

Monk is offline   Reply With Quote
Old 05-26-2016, 11:03 PM   #3
Junior Member
iTrader: (1)
Join Date: Apr 2012
Posts: 187
Total Cats: 3

exhaust side of valve cover needs to have a fresh air connection. that's how the PCV system works.
motormechanic is offline   Reply With Quote
Old 05-26-2016, 11:09 PM   #4
SadFab CEO
iTrader: (3)
hi_im_sean's Avatar
Join Date: Sep 2012
Location: your mom's house phoenix, AZ
Posts: 3,904
Total Cats: 613

just stick a filter on the exhaust side, if it weeps, then run it to a home depot catch can and stick the filter on the catch can.
hi_im_sean is offline   Reply With Quote
Old 05-27-2016, 11:37 AM   #5
Junior Member
Thread Starter
Join Date: Jan 2016
Location: Allen, Texas
Posts: 65
Total Cats: 2

Thanks guys! I bought two filters, one to get the car running and another for when I install the catch can. Thanks again!
crispyBYM is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Questions about alternator control in my Exocet boileralum MEGAsquirt 6 03-19-2016 08:07 PM
Intake manifold piping issue! AnotherDamnMiata DIY Turbo Discussion 10 03-18-2016 10:45 AM
DIY: How to tap fuel rail on NB2 for return fuel system ajay842 Engine Performance 18 03-17-2016 06:03 PM
Hey (TX) K_sr20 Meet and Greet 8 03-10-2016 04:36 PM
Hey guys, Los Angeles/Historic Filipinotown. pinoykid1307 Meet and Greet 4 03-09-2016 10:37 PM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 04:31 AM.