# Catch can design and fabrication

**URL:** <https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654>\
**Category:** Shift518 Automotive\
**Created:** [January 28, 2011, 6:29am UTC](https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654 "2011-01-28T06:29:39Z")\
**Posts on this page:** 1\
**Showing post:** 40

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**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\
**Post date:** [February 1, 2011, 2:29pm UTC](https://forums.speedlife.net/t/catch-can-design-and-fabrication/256654/40 "2011-02-01T14:29:32Z")

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> [@noisy rear end](https://forums.speedlife.net/t/noisy-rear-end/39318/3):
>
> Nice setup, nothing wrong with not having vacuum. With that amount of capacity and those nice large breathers, its unlikely that you will ever see any positive pressure.

exactly, and if you do you’ve probably got bigger issue to worry about in the bottom end.

I’ll typically do a closed loop system on a mild car that’ll likely see the 3K mile oil changes only because a closed loop system purges alot of the acidic air out of the crankcase that can contaminate the oil. On a car like something we drive, we take better care and are more prone to change the oil more often so it’s kinda null and void at that point.

> [@Craigslist find of the day.... Integra type R](https://forums.speedlife.net/t/craigslist-find-of-the-day-integra-type-r/39311/14):
>
> uuuuuuuuuugh. All these powerstroke morons take the CCV tube and run it out of the engine compartment and all the way out the back of the truck. The very next week they post up about a front or rear main leak. :facepalm
> 
> Adam, The oil in the intake doesn’t really bother me much at all, in any of my cars. Is this a useful mod to do in the a) the cobra b) the tdi or c) the truck? Also HOW should these be done? Should I be going to catch-can and recirc or should I just vent? I’m really tired of being confused about it.

diesels have a tendency for more blowby, hence why the oil is NASTY shit when it comes time to change it. On the 2500 I run a typical exhaust CCV system right into the DP as previously mentioned. Have never had an issue in the ~2 years it’s been like that. I haven’t touched the duramax as it’s my sisters, but If it were mine I’d do the same thing.

global warming is here, might as well ride the wave :lol

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