PCV Delete, Catch Cans, and Unmetered Air

ChaseZ

What setup are you guys running?

There are a few ways to do it, and pros and cons to most of them. I don't want unmetered air going in, but don't want the engine bay to look like the tar pits so something's got to be done. Had been planning on a catch can basic set up but there are better ways like a Moroso remote breather or Mighty Mouse set up.

So curious to learn about others setups and see what works best on the VQ

Wonka2581

Sub'd

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ChaseZ

Moroso 85470

https://www.summitracing.com/parts/mor-85470

ChaseZ

Mighty Mouse Catch Can

mmsolutions

ChaseZ

Cusco Catch Can universal kit

ChaseZ

Then there's always this

phunk

I run the valvecover check valves to the intake manifold. I run the valvecover open vents to the intake tubes (suction only side). I cant even count how many cars I did this way and never had a problem! If its a big boost car, I have over-sized the lines and enlarged the valvecover ports before.

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Wonka2581

Huh? Sorry trying to understand.. I really don't know much about catch cans.

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phunk

Hmm I am not sure what other details I could include my description. But no knowledge of catch cans is required since what I am describing lacks the use of them at all.

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Wonka2581

lol I hear ya, I'll be doing some researching on them. Thanks

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"I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

ChaseZ

VP Scavenger Kit

https://www.summitracing.com/parts/vpe-11189/overview/


I include this one largely for conversation sake. I'm not considering it but it is an interesting idea, if it actually works. Then again if it did work would there not be the potential to coat your cats in an oily mess? Clearly you could put it further downstream but the further away the less change it would actually scavenge anything and produce any vacuum whatsoever.

This is me thinking aloud anyways.

future370zzz

I'm not running any of this stuff. Is that bad?

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PongSanity

I use the Admin Tuning dual catch can/coolant reservoir. It's fully vented from the four ports into the atmosphere.





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phunk

A factory style PCV system allows oil vapor into the intake tract. An oil film will build up inside the intake tubing and intake manifold. This means you will consume a minuscule amount of oil through combustion, which according to the theory, will reduce the fuel octane.

That said, unless your engine is in terrible shape, the consumption is likely much too low to cause any perceivable increase in knock tendency. A looser fully built engine with tons of boost can have increased piston ring blow-by, increasing the flow through the PCV system. This is when I might start to consider a catch can, but I still would probably personally prefer to just go open on the ventilation to keep the engine bay less cluttered.

People with catch cans will observe what appears to be a significant amount of oil collected in their cans. I say if you put that oil back into vapor form and disperse it evenly through all the air the engine has ingested in that time, you would find it be nothing. There is also a question of how much of that oil collected is a direct result of eliminating the crankcase vacuum which many believe helps the rings seal, reducing crankcase vapors. If that's the case, it can make the catchcan a sort of self ful*filling* prophesy (see my pun there).

None of my belief is backed by scientific study. Just a matter of having always left it alone yet always having great success with my builds.

Great looking bay. Only thing i would change is one of the first mods I did to my 370z... rerouting the starter cable through the cowl instead of how the factory draped it over the timing chain covers.

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Jshvr

After the research I have done I've decided to go with the following set up. I have two small mishimoto sealed catch cans. I capped off the intake. Breather filters on the pcv valves. Catch cans between the valve cover and the intake pipes. I am boosted so my line of thinking was if I put it as stated then I would still have suction under boost. If I had put the catch cans on the intake manifold pcv tubes then I would have no suction under boost. I'm just hoping that the catch cans are efficient enough to prevent oil on getting into the intake. I haven't been able to install my set up because my car has been at Z1 waiting for a tune for a long time. Their dyno is broke.


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