UK-POLOS.NET - THE VW Polo Forum

Does anyone know the diameter of the breather filter pipe on an 8v 6n? I need one for my bmc but don't know the width to order

It'd bigger than the copper piping used in your house heating

If the weathers good I'll be working on my car tomorrow and I'll try and measure it for you.

Brill, cheers mate.

I'm a central heating engineer and copper in your house is 15mm to the rads 22mm else where. May help you a bit.

Polo96CL wrote:Brill, cheers mate.

Speaking of breather filters, I did measure it in the past but cannot remember the exact size, I member ordering a 15mm one for test purposes which I did fit but it was slightly off in size.

As what i found was, the filters have a rubber pipe at there base, meaning you need the outer diameter size to make it fit on the breather pipe that you will cut down. This also has a problem, how will you seal it on firmly if both are silicone/rubber material. Which means a jubilee wont work neither will cable ties as to much of a tug and you will start caving the piping in and causing the breather not to breath.

What I did was:


................_____
.............../.........\
............./_........._\.......... Filter
...............|........|.........
...............|____|.........
...................................
...............______.........
...............|........|.........
...............|........|.........
...............|........|............Copper pipe
...............|........|.........
...............|____|.........
...................................
...............______.........
...............|........|...........Cut back breather
...............|........|.........

What I did was cut down a copper pipe to about, a guess as this was 4 months ago 10cm, then shoved it down the breather which I cut back/down. Whilst holding the copper pipe half submerged into the breather I cable tied it tightly. So I was left with a breather pipe with a firm bit of copper pipe sticking out on top of it, then I put the breather filter on top of the copper pipe and cable tied it down.

So if I am dealing with the car tomorrow I'll measure it up for you. Another good idea might be to get a breather tank so if any engine boogers come up they go into that! Think they are around £60 but that was along time ago I looked.

If you do end using central heating piping, rather than copper, buy a length of plastic pipe, easier to cut and you can get in varied colours and the same sizes. But the bonus of copper is that you can bend it.

lolhoward wrote:If you do end using central heating piping, rather than copper, buy a length of plastic pipe, easier to cut and you can get in varied colours and the same sizes. But the bonus of copper is that you can bend it.

Would the plastic take it from the heat and the chemicals fuming in the breathing system?

Well it can withstand the heat from a central heating system and any chemicals you put in the system. Cant see it being a problem. Some boilers use simular rubber hoses inside simular to the ones in the engine bay.

lolhoward wrote:Well it can withstand the heat from a central heating system and any chemicals you put in the system. Cant see it being a problem. Some boilers use simular rubber hoses inside simular to the ones in the engine bay.

Sounds good, so if you want cheap induction plumbing go to B&Q

For those interested, the diameter of the breather filter hose is 25mm. Will order a breather filter of the correct size now

my 1.4 8V is a 19mm breather? Just ordered all parts req & BMC CDA. Suprised there different

Perhaps its different on a mk5 i'm not sure but its defo 25mm on the Mk4. Are you sure you've not accidently measured from the hole and not the outer of the pipe?

Sorry forgot they were talking about a mk4

I was on about my mk5 so take it there different.