home made catch tank wtf????

[rowlers]

knocked up a quick catch tank yesterday just to see how much oil my valver was puching into the intake...

done 60 miles today...
had a look in my "Lucozade" bottle tank and it has a watery, yellowing liquid in it - not oily at all as I was expecting.

Wtf is this stuff???
It does stink as well, oily/fuely???

What else could it be other than oil?

There isn't alot of but it is deffo there.

It does use oil, but doesn't use any water and is doing 32 mpg, (calculated from filling up!)

[DarnPB]

Most of it should be water condensation. But a little fuel will also find its way in there too, and when the engine warms up, the fuel will evaporate and get ´breathed´ out. Depending on how worn your engine is will depend on how much fuel gets into the sump. Mine was excessive and played hell with the emissions. I´ve just finished the repair now by stripping down the engine, dimensioning and replaceing the rings. Got away with a rebore and new pistons luckily. Now to run it in then try again.

[monzablue16v]

Which pipe did you take off for the catch tank? any chance of a pic? I am trying to figure out how to do mine. And that'll be all the crap that goes round all the inlet of the engine ISV and causes it to run funny.

[rowlers]

just empyted the "liquid" out and it is just water basically, which is why I had mayo on the air intake etc....

its just the pipe from the front of the block that goes to the air box, plug into a lucozade bottle, tape up. make a hole in the bottle to breathe to atmosphere. Bung the air box with lump of blu tak!!!

be warned tho - the fumes come into the car through the vents - unless you plumb the "catch tank" back into the airbox.

[monzablue16v]

there is also a little pipe that goes to the inlet manifold not sure if that is to create suction or to breathe back in there seems like a real design flaw, it can't be good for the engine. Have to have a play when the engines back in.

[DarnPB]

there is also a little pipe that goes to the inlet manifold not sure if that is to create suction or to breathe back in there seems like a real design flaw, it can't be good for the engine. Have to have a play when the engines back in.

This pipe is a requirement by the environmentalists, bless ´em. The suction, or correctly put, negative pressure is to recycle the breather fumes and burn them to reduce harmfull waste gasses from going straight to atmosphere. A nice thing to do, but not so nice for the environment, is to take the breather pipe, extend it and direct it to under the car. Then block off the hole in the induction manifold. The engine would run a whole lot better after receiving a pure charge rather than a contaminated one. Plus the induction system will stay clean, and reduce the amount of mayo in the top of the engine.

[mk2mark]

Just a note, be careful using plastic for catch tanks because the oil coming out of the engine is gonna be hot.

[rowlers]

I've only done it as an experiment.

If there is loads of oil and sh|t comes out then i'll get a proper catch tank. If next to nothing is coming out there doesn't seem much point in fitting a proper one???

[Bluefox]

This pipe is a requirement by the environmentalists, bless ´em. [/quote]

Damn environmentalists. They're the whole reason for that manky EGR system on TDI's. Least the petrol's don't get as much sticky black stuff stuck in the inlet tract.

[rowlers]

just water again in mine today - only done 14mls though - 60 miles 2moro see what appears then!

you can actuall see the fumes coming out of the bottle when your under the bonnet - was just heat and vapour no smoke or anything thank god!!