Oil catch cans??

Been looking at these on eBay, are they any good? Are cheap ones ideal? Also, are they easy to plumb in?
Thinking of getting rid of air con and putting a oil catch can in its place.

I'm curious as well about them
Like the logo of the cdf one also Ralleytek are fetching a new one out in the future

I'm not a techie so what do they actually do ?

Catch oil

atwrx wrote:

Catch oil

If it was filling up with oil, I'd say you had a fooked lump.   

Marshffs wrote:

Been looking at these on eBay, are they any good? Are cheap ones ideal? Also, are they easy to plumb in?
Thinking of getting rid of air con and putting a oil catch can in its place.

Ive done this on mine, it didn't look right sat next to the alternator so I mounted it onto the inside of the passenger side wing

to be honest they are only a "nice to have" cosmetic toy, not a "must have" if you know what I mean

maca wrote:

Marshffs wrote:

Been looking at these on eBay, are they any good? Are cheap ones ideal? Also, are they easy to plumb in?
Thinking of getting rid of air con and putting a oil catch can in its place.

Ive done this on mine, it didn't look right sat next to the alternator so I mounted it onto the inside of the passenger side wing

to be honest they are only a "nice to have" cosmetic toy, not a "must have" if you know what I mean

Like that ever stops anyone from buying something   

    

Your right there!   

I wanted it to smarten the bay up and add abit of bling, on the passenger side wing i have alarm speaker and canister so only place it can go is next to the alternator when i take air con out. What does the carbon canister do??

Not sure but I pulled mine out and binned it   

I was told it was safe to do so hahaha

Once you pull all your ac out there's plenty of room   

Catch oil or be cool in the summer ??

Iv hears they stop oil getting into the intercooler? Plus with me doing a good tidy its abit of bling for the summer lol

As explained by Mr Forrest.
'The original PCV (Positive Crankcase Ventilation)system does indeed do some good for the engine by ensuring the corrosive gasses are removed from the crankcase and replaced by fresh filtered air.
The Subaru system has two main phases depending on manifold pressure/vacuum.
Under manifold vacuum conditions (probably 99% of the engines life) there is a non return valve under the throttle body, which allows the 'blow by' vapours to be drawn into the manifold. The vapours are replaced from the vents on the cam covers, supplied from the inlet duct. This provides the circulation of air through the engine, prevents condensation, oil contamination and internal corrosion.
This is indeed a good thing and there is a strong case to retain this system if the car is a daily driver.

Under positive manifold boost conditions, the non return valve under the throttle body closes and the hot 'blow by' gasses (Note - 'blow by' tends to be a cool vapour at low power but a hot gas at high power) are re-routed via a 't' piece to the intake duct for reconsumption by the engine. The cam cover vents may also vent out during this phase.
This is where you can get oil suspended in the gasses finding its way into the induction system......this is a bad thing ! The oil coats the intercooler, reducing efficiency and causes premature det due to lowering the octane of the fuel.

It is possible to 'catch' the suspended oil in a 'catch can' This is a reservoir deigned to reduce the velocity of the gasses, allowing the oil to fall out of suspension. The oil collects in the bottom of the can and the oil free gasses carry on to be either reconsumed by the engine or vented to atmosphere. The catch can will ideally intercept all 3 vent lines although the main culprit on the Subaru would appear to be the central crankcase vent.

The return of gasses from the catch can is also the subject of some debate. If the gasses are reintroduced to the intake system then you are asking the engine to burn an oxygen free mix ! ie you are reducing slightly the amount of oxygen fed into the engine, this can only mean less power. I personally prefer to vent to atmosphere and block off the return to the intake system. There are concerns that this is not very 'green' however the vented gasses are just of the same constitution as your exhaust gasses (assuming you have a decat exhaust)'

^^^^^^^

Good bit info that mate!

Pleased mines just vented off to the atmosphere (more power   )