Well i can safely say the catch can works

After around 1k miles this is what had been collected in mine :eek: :eek:

As you can see from the pic that is nearly 130ml of Carp which would have gone back into the head. :eek::eek:

Now all i have to do is show the missus how to empty it whilst im away

Carl

Edited 18 October, 200916 yr by Mater

Nasty.

thats a fair old bit, wonder how much of that would have found its way back round

What are you catching and where ? It certainly doesn't look like carp to me

D

It is coming from the Cylinder head.

See here for what i'm talking about

Catch Can Clicky

Carl:thumbup:

is that from a smoker's lungs?

But what is it, water & oil?

But what is it, water & oil?

Yup

Carl:thumbup:

The catch can is very much dependant on the can itself. If you get a well designed one it can work well, if you don't, it can either not work or even put bits of metal into your engine.

You get what you pay for in terms of these things.

Ouch! Really a lot. Interested and actually searching for a good easy back-to-standard DIY on that.

imho, that's way too much fluid for such a short distance.

I'd be interesting to have it analysed for contents of oil / water etc.

Keep a check on engine oil levels to see if it fell by same amount.

Has water header tank any signs of oil contamination?

You need to make sure it won't freeze in winter especially with that amount of water.

ive emptied mine twice now, and both times i think it has nearly been full. i now empty ti about every two weeks to make sure its not dlowing back into the head.

I certainly wouldn't have expected it to look so liquidy....

Yeah, that looks like mostly water. Mine collects a thick grey goo + water.

When the weather gets cold petrol cars let out a lot of condensation, so it might just be that extra that is run.

It might be worth putting an overflow pipe on that below the breather intake as if it gets too full and you corner too quickly you could end up with the engine breathing water. Fundamentally that would be a bad thing TM

Why not dump it constantly instead as the amount that flows must be tiny, just pipe it out under the car

When the weather gets cold petrol cars let out a lot of condensation, so it might just be that extra that is run.

It might be worth putting an overflow pipe on that below the breather intake as if it gets too full and you corner too quickly you could end up with the engine breathing water. Fundamentally that would be a bad thing TM

This is a really smart advice for my DIY. Despite aesthetic, I'm going to do it with - basically - a plastic bottle with a screen and some metal wool: 1 flow inlet, 1 flow outlet, 1 oil drain outlet, 1 overflow (thank you again). Some plastic bits to connect to original piping. Ideally I'd need a plastic can with 2 caps to work comfortably... mumble, mumble...

Hmmm, looks rather a lot like engine oil to me...?

This is a really smart advice for my DIY. Despite aesthetic, I'm going to do it with - basically - a plastic bottle with a screen and some metal wool: 1 flow inlet, 1 flow outlet, 1 oil drain outlet, 1 overflow (thank you again). Some plastic bits to connect to original piping. Ideally I'd need a plastic can with 2 caps to work comfortably... mumble, mumble...

Fundamentally I think that's a very bad idea. Some of the cheaper catch cans have metal wool in them and as this starts to degrade due to heat and moisture you end up with shard of metal making their way into the engine. Obviously that is bad.

If you're concerned you could get a suitable bottle somewhere to catch the vapour and pull in air through a pipe with an air filter on the end of it.

I'm not sure however if this would set off a warning as the engine could check that there is pressure there and a lack of it would cause a warning. If that is the case, then a proper catch can would IMHO be the way forward.

Hmmm, looks rather a lot like engine oil to me...?

Explains why the TFSI likes so much oil if that is the case, as it's basically breathing it then burning it off.

IMHO it's not quite the right colour for oil, but even if it's largely water there certainly is a good amount of oil in there.

Excuse me revisiting this, but has anyone with a catch tank noticed (over time) any improvement to engine performance/running or oil/petrol consumption?

Short answer

Nope. But it's designed with keeping longevity in mind i think rather than for performance etc.

Short answer

Nope. But it's designed with keeping longevity in mind i think rather than for performance etc.

Fair enough. Just wondered if over time the engine might run a bit smoother starved of its diet of gunge...

To be honest i haven't driven the car much as i use the Diseasel due to the amount of miles i do and the wife uses the vRS. But on the times i have i haven't noticed any difference. You do still get mayonnaising under the oil cap in winter from short journeys. However when you empty the catch can quite a lot of it comes out of that too.