How To Install Oil Catch Tank

[NeilGTi85 5]

Hello All,

 

I want to stop the oil going into the throttle body from the breather, so have decided to get a catch tank.

 

I have seen 2 ways in which to connect it, which is best?

 

 

 

Thanks

[taylorspug 7]

No real need for a catch tank tbh, just route that pipe from the rocker cover straight to air down the back of the block. Ive done this on mine and barely anything other than a bit of vapour comes out of it anyway.

[DrSarty 90 1 Cars]

I want to stop the oil going into the throttle body from the breather, so have decided to get a catch tank.

 

If that's the case, then why would you do it the second way pictured?

 

It's oil vapour with contaminants BTW, not 'oil'.

 

Just make the crank case and cylinder head oil vapour breather circuit go into and back out of the catch tank; job done.

Edited November 11, 2009 by DrSarty

[NeilGTi85 5]

If that's the case, then why would you do it the second way pictured?

 

I was told on a certain forum , that running the vapour thorugh is better for the emission's. I did wonder about this.

 

There was defently oil in my tb when I took it out for a clean.

 

I will do as you say dan, run the pipe from the catch tank down to the floor.

 

Cheers,

 

Neil

[Cameron 16]

There is most definitely a need for a catch tank, if you happen to have a load of oil chucked out the breathers at least you get some warning before you go spewing it all over the road / track surface. Seems pretty irresponsible to run without one!

[taylorspug 7]

Theres no oil coming out of my car, its actually put together well, although i wouldnt like to speak for others.

 

Plus a catch tank is what a litre? If oil is spewing out at that high a rate that its making a difference to a road or track surface, its not going to take long before its pouring out of the catch tank, so im not sure what warning you are going to get. Also that oil breather in the Gti6 cam cover has an oil trap in it, theres really very little chance of any oil coming out of it. It is literally just a breather.

Edited November 11, 2009 by taylorspug

[Galifrey 1]

I was told on a certain forum , that running the vapour thorugh is better for the emission's. I did wonder about this.

 

What is there to wonder about? Spouting oil fumes into the atmosphere or burning them off in an engine... which is likely to have the best emissions

 

Of course the downside is, rebreathing the crankcase fumes can cause detonation and lumpy running.

[Cameron 16]

Theres no oil coming out of my car, its actually put together well, although i wouldnt like to speak for others.

 

Plus a catch tank is what a litre? If oil is spewing out at that high a rate that its making a difference to a road or track surface, its not going to take long before its pouring out of the catch tank, so im not sure what warning you are going to get. Also that oil breather in the Gti6 cam cover has an oil trap in it, theres really very little chance of any oil coming out of it. It is literally just a breather.

 

That wasn't a dig at your car by the way, I was just saying IF you had oil blowing through the breathers!

 

I've had oil coming through mine before, when I was running the rings in and it was breathing heavily.. and I know there are a few cars (judging from recent threads) that have issues with oil coming through the breathers. Not necessarily pouring out, but at a rate that could easily cause problems on track. I just think its a good idea to be running one, and I know that certain race regs will require you to have one. So basically, they aren't completely pointless!

[Miles 331 1 Cars]

All Race/Rally regs state you need a catch tank, I would always fit one as it does keep the oil film from the fumes down,

 

You can;t take the last pic as a guide, Just noticed the Earthing kit on it

[taylorspug 7]

That wasn't a dig at your car by the way, I was just saying IF you had oil blowing through the breathers!

 

I've had oil coming through mine before, when I was running the rings in and it was breathing heavily.. and I know there are a few cars (judging from recent threads) that have issues with oil coming through the breathers. Not necessarily pouring out, but at a rate that could easily cause problems on track. I just think its a good idea to be running one, and I know that certain race regs will require you to have one. So basically, they aren't completely pointless!

 

 

No no i didnt take it as that, the first line was alluding to much the same point you have just made. Ive not personally had a problem, my MI was run like that aswell with just a pipe, and tbh everytime i checked the pipe it was dry top to bottom. In all honesty i very rarely have to even top up the oil in mine between services!

 

Lol yeah the 'earthing kit' just about sums it up!

Edited November 11, 2009 by taylorspug

[Alastairh 47]

Just noticed the Earthing kit on it

 

Sod the earthing kit, have you noticed the cover on the radiator on the 206?

 

Sorry, off topic, but it does make you wonder sometimes!

[CosKev 16]

If you want a PROPER breather system that works get one from here:

 

http://www.saikoumichi.com/OCC_explanation.htm

 

Got one on my Evo and it works spot on

 

I can't really see that a naturally asp Gti6 eng should get that much oil out of the breathers to warrant a breather system though

 

Different alltogether once you start turbo charging

[SurGie 54]

There is most definitely a need for a catch tank, if you happen to have a load of oil chucked out the breathers at least you get some warning before you go spewing it all over the road / track surface. Seems pretty irresponsible to run without one!

 

 

Agreed, my old MI16 2.0 with carbs let a little oil through the pipe i had fitted with no catch tank, it went down towards the road. I then

fitted an oil catch tank with one of the pipes hanging towards the road (to stop the oil vapour coming into the car) with oil catch tank filter on the

end. It stopped the smell of burning oil vapour coming into the car, went right up my nose TBH.

 

Any engine that is in top nick may be ok, but i would not risk doing it without some sort of blockage TBH, just in case.

Edited November 12, 2009 by SurGie

[DrSarty 90 1 Cars]

Any engine that is in top nick may be ok, but i would not risk doing it without some sort of blockage TBH, just in case.

 

I'm not sure the age of an engine has anything to do with how heavily it breathes.

 

I'll never forget Matt at QEP discussing my engine build with me and making it very clear that 'that type of build' (N/A remember) needed to be able to breathe well. And my engine was effectively brand new.

 

He even mentioned a recent similar build where it was restricted on power due to an insufficient oil & crank case breather system.

 

I'm no expert, but I would say it has to be down to higher CRs running on a tilted engine of a certain block and head design that perhaps means it builds up pressures which simply need be allowed to circulate, with a catch tank or not, as otherwise it seems to restrict performance.

 

Matt said on this particular car, when they popped a breather hose off when they were trying to figure out why it wasn't quite performing as expected, it was like it got another wind, so perhaps a poorly functioning breather system chokes an engine somewhat.

 

Other engines have PCV systems so it must be quite an important science. Maybe installing a catch tank (properly) does actually help an engine, and don't forget - a bit like Dan said - engines used to just vent to atmosphere (down the back of the block), in the old days dumping oil on the road, and it's only modern environmental issues that are why we see circulating oil vapour systems putting oil vapours back into the inlet tract.

 

Based on my logic, done properly, I think a catch tank is a good idea.

Edited November 12, 2009 by DrSarty