Has anybody installed an oil catch can on an NA sedan? If so, where did you mount it and where did you make your connections?

pixes?

thanks in advance, ted


'03.5 Sedan 5a: BS/G, Prem, Aero/Body, Sport, Nav
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nobody, huh?

guess I'll just have to go be the first one then.

-T


'03.5 Sedan 5a: BS/G, Prem, Aero/Body, Sport, Nav
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Please keep me updated on what you come up with Ted.

Anthony

2003.5 Black 5AT Sedan
z-tube/ jwt popcharger/crawford plenum/crawford cats/
stillen exhaust/grounding kit/e-fans
technosquare ecu /350z thermostat/double din

 

In 10K of often hard charging driving, that oil line thingy to the intake has remained absolutely bone dry, not a drop of oil to begin to fill a catch can. That's my experience. I thought about installing one, until that point, now it's like what's the point (for me at least).

"All that's necessary for the forces of evil to win in the world is for enough good men to do nothing.”
Edmund Burke

G35 6mt

 

Gsedan35...

by chance, is your catch can baffled? If not, did you put something like filter media, or steel wool in the bottom of the can to give the air flow (and oil vapor) some surface area to cling to?

Cheers, ted


'03.5 Sedan 5a: BS/G, Prem, Aero/Body, Sport, Nav
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I'm definitely thinking about an oil catch can after installing my plenum!
when I took out my stock plenum, I saw that the insides were coated with oil (a fine layer and almost dry) and even more oil collected along the gasket.

I wouldn't say it was alot, but I figure I should do something about it...



<font color=blue> 2004 6MT Coupe </font color=blue>

 

well.. I have been having some interesting exchanges with Q45tech... Dennis states the following:

<blockquote><font class="small">In reply to:</font><hr>

The normal PCV vapor RETURN enters inside the plenum after the throttle body - during cruise and steady speed.
At WOT there is no vacuum to suck the air thru in the normal mode so ring blow by and just churning in the crankcase sends vapor in reverse out the inlet.

Race cars use a vacuum pump to lower the crankcase pressure.

<hr></blockquote>

then I asked him to clarify and he responded:

<blockquote><font class="small">In reply to:</font><hr>

You can install it anywhere...........but you must decide which oil vapor you are trying to catch and condense into liquid oil [in the cannister].
Study the PCV flow and its operation under the three different conditions: Idle, cruise, and WOT.

What are you trying to fix? Dirty oily plenum interior from cruise flow or reverse flow from WOT [when PCV shuts down].

Not meaning to be cryptic but it depends on your articulating what non existent [not detremential to engine operation]problem you are trying to solve. What percentage of time are you running WOT compared to cruise idle.........A few 15 second bursts per week/day or an hour long race............Supercharging where you have positive pressure in plenum/after MAF is a special case as the PCV never works right without a redesign in hose and valve size.

When you increase cylinder pressure you create more blowby thus at WOT this can only escape from the inlet tube/hose as the PCV valve is shut [closed] because there is no/little plenum vacuum to pull it open at WOT.

On previous Nissan engines with EGR valves the necessary exhaust crud [for Nox reduction] and engine blowby vapor mixed after the throttle body in plenum neck creating a black slimy mess, that coated the rear [and under] plate of TB and the inside of plenum down to injectors where it was washed clean by gasoline spray.
With variable cam based EGR only the oil vapor from cruise should be in plenum/TB [plus what ever dirt you let in with non factory air filters].

With Synthetic oils the vaporization points are higher [all the molecules are the same size] no light, medium, heavy mixture as in conventional oils so much less evaporation of light component in base oil, so the oil vapor is significantly less to pass thru PCV system.

Rather than a catch can I would just use synthetic oils Mobil 1 or better . In the past some systems used a fine round brush inserted in the inlet hose to act as a condensing point to solve the reverse flow............you pulled the hose and used solvents to wash the brush clean or bought a new hose with a new brush inside.................all depends on how much blowby you have.........New engines don't have much unless the rings are not set or are worn quickly from bad air filters.

Oil type/quality is the usual cause of any abnormal oil in the air hoses leading to [in front of] TB.

Hope this helps.

<hr></blockquote>

Seems to coincide with what Gsedan35 experienced (no "catches" after 10k mile of hard driving)

I have been running mobil1 synthetic since 500 miles....and I change it every 3k. perhaps this is one mod that is not necessary on the VQ35DE? So I am going to kick back on this and watch to see if any other techs have something to contribute.

Cheers, ted




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