Oil catch can

[Lurkin]

Was keen to add a oil catch can using a deisgn from one of the other threads, to a 4age silvertop.

Got cheeky and bought one off trademe - but its all back to front... ie it has the 'in' pipes at the top of the can, and one at the very bottom on it -

ie it has not breather.. was planning to have one as to vent the case into it etc etc.

how can I add one without drilling anything? a t section on one inlet and use the other to a filter? - does this sound like an ok idea?

[Paulio]

wtf that sounds like some sort of resovoir.

whats the trademe link so we can see the tank?

[Lurkin]

Hey Paulio

there was no photos on the auction - he had it listed on another auction as another item for sale - thus he created a new auction without photos and I accepted the buy now - without realising it was abit unusual..

has definitely had oil in it...

i think its been used on a closed system as opposed to vented perhaps?

[Loudtoy]

Can't remember exactly without looking but you need 2 inlets and one breather and the abilityl to block the hole your going to have in the intake pipe to run a catch can, 2 from the intake-head side. (PCV and rocker cover) and what ever to block off your intake hole - or if it's baffled you can run the 3rd out/inlet off your breather back into the inlet pipe which means you will still get the fumes but no the sludge/liquid that you would normally get back through a factory system

[Crampy]

Do it like this:
Good setup.

[Lurkin]

hmm na not going to bother running it back to the engine - its being used on n/a in a non race situation - thus not really required there shouldnt be that much oil going through.. really just to save having to clean out the TB...

[MAGN1T]

Doing it the way in the photo disables the PCV system. So now there's no fresh air being drawn through the crankcase.
So it's a downgrade as in a step backwards as in screwing up the motor.

It depends on why you're fitting it. If you actually need one, then your motor is already screwed and so it's just a bandaid.

Steve

[Lurkin]

You've lost me Steve.

I was intending to fit this in order to avoid oil being put into the intake ie lower the octane etc. etc.

Frankly I hadn't really thought about fresh air - I'm assuming this is drawn through the pipe to the intake - which is not exactly fresh if oil vapour has been heading into that pipe sure no more than that in the can itself?

does the freshness really matter? I thought the idea of the breather/ putting through to the intake was to both avoid the pressure increasing (by not having vent) and to avoid dropping the oil directly onto the road (not bothering with a catch can in the first place).

I realise the addition of the tank is usually a rice show off piece - but that was not my intention....

Crampy - that was the set up I had in mind - its just the can I've bought doesnt have any fitting on top for a breather?

[Mr Revhead]

you could just do what most ppl do
ignore magn1t because as usual, he is not 100% right and is either an idiot, or being purposely inflammatory.

I ran my ae101 like crampys set up.
some times you get a whiff of the oil fumes, other than that there is no disadvantage. the big advantage is it stops the fumes getting into the intake, and is a big help in reducing the pinking and stuttering these things get at times.

[pc]

Doing it the way in the photo disables the PCV system. So now there's no fresh air being drawn through the crankcase.
So it's a downgrade as in a step backwards as in screwing up the motor.

It depends on why you're fitting it. If you actually need one, then your motor is already screwed and so it's just a bandaid.

Steve

I put one on my freshly built engine. Haven't poured any oil out of it yet, but I get dirty looking water.
as for the "fresh air", if it's not sucking the crap out of the bottle (i.e the pipe goes in the top) and if the bottle has a filter on it... doesn't get much "fresher" than that.
Agree that it is not the solution for an engine that is blowing oil in to the intake.. but that hasn't been stated.

[Mr Revhead]

Haven't poured any oil out of it yet, but I get dirty looking water.

and quite a bit too!

[Crampy]

I ran my ae101 like crampys set up.
some times you get a whiff of the oil fumes, other than that there is no disadvantage. the big advantage is it stops the fumes getting into the intake, and is a big help in reducing the pinking and stuttering these things get at times.

That's not actually my setup. I found it on the net, but I'll be doing the same sort of thing.

Short of putting a vacuum pump on it, I'd say this is the best way to do it on the 20V.

[Lurkin]

once the camera has charged I'll add some photos - which will explain what I'm on about wayyy better.

on the topic though - whats the best thing to use to block off the intake + PCV valve? I can think of rangi ways of doing it (bolt in the end of hose off it) but would prefer to do it 'properly' - any ideas?

[matt dunn]

Doing it the way in the photo disables the PCV system. So now there's no fresh air being drawn through the crankcase.
So it's a downgrade as in a step backwards as in screwing up the motor.

It depends on why you're fitting it. If you actually need one, then your motor is already screwed and so it's just a bandaid.

Steve

WTF?


Did you learn that in your pretrade course yesterday and believe everything the tutor tells you?

The main reason for fitting a catch can is to stop the oil vapours from entering the intake system and lowring the octane and creating detonation,
which the factory ecu detects and drops timing and so drops power.

it is a dyno measurable difference on most cars.


How the F does Fresh air get into the system anyway?
not through the PCV Valve that's for sure, as even on a brand new engine there is enough blowby to make sure the air is only flowing one way, out.

Is the block porus? or do you assemble engines without the rear main seal?

[deaf_rattle]

I ran my ae101 like crampys set up.
some times you get a whiff of the oil fumes, other than that there is no disadvantage. the big advantage is it stops the fumes getting into the intake, and is a big help in reducing the pinking and stuttering these things get at times.

That's not actually my setup. I found it on the net, but I'll be doing the same sort of thing.

Short of putting a vacuum pump on it, I'd say this is the best way to do it on the 20V.

pretty sure thats how the silvertop one is set up in the fxgt of doom.
and there is abit of oil in that catch can.

[Lurkin]

can we move on from Steves comment?

ok so the can looked like this once purchased.

There is no other fitment 'on top' ie, the can does not appear to allow for a filter on top. one could be added at the bottom - but gravity defeats the purpose - all the oil would surely wind up in the filter.




So the idea was to utilise one of the top breathers with a t joint - for both accesses to the rocker cover. the other inlet will be used for the filter (dont have one yet so you'll need to use your imagination)

I got the 't joint' (im sure there is a more technical term for this) off a legacy, which seemed to use it in a similar way from the two sides of its boxer engine...

[Mr Revhead]

I don't think that would be optimum
the airmix will follow the path of least resistance, so will try and bolw out the filter before reaching the can.
prob best to resell the one you have and get another

[matt dunn]

prob best to resell the one you have and get another

Which is probably what the person before you did.


Or get it modified.

[Crampy]

I ran my ae101 like crampys set up.
some times you get a whiff of the oil fumes, other than that there is no disadvantage. the big advantage is it stops the fumes getting into the intake, and is a big help in reducing the pinking and stuttering these things get at times.

That's not actually my setup. I found it on the net, but I'll be doing the same sort of thing.

Short of putting a vacuum pump on it, I'd say this is the best way to do it on the 20V.

pretty sure thats how the silvertop one is set up in the fxgt of doom.
and there is abit of oil in that catch can.

It sure is.
Much petter than the stock way. Probably helps heaps on that motor too, as it seems to breathe quite a bit.

[Crampy]

Drill out the top of it and weld in a bit of pipe for the filter to go on. Use the two inlets for the cam cover breathers and use the bottom as a way to empty the tank. Done.