Oil Breather One Way Valve

[rescue dude 0]

I was sprinting my car at Pembrey saturday and discovered my breather system is not really up to the job so i'm going to put it back to a sort of standard set up.

I've ordered some hoses from BBM and the very nice chap there mentioned that he fitted a one way valve into the filler pipe to stop oil from being blown back up the pipe and out of the filler cap. He couldn't remember exactly what part it was but said it was a one way valve from the brake servo system of 'a peugeot '

 

Any ideas of a part number? Has anyone else tried this method?

[rescue dude 0]

I take it nobody knows?

[samc 1]

i cant see how it would work to be fair, wouldn't it only let oil and vapours out or in? i know you can get an oil seperator on old porsches etc that might help

[rescue dude 0]

i cant see how it would work to be fair, wouldn't it only let oil and vapours out or in? i know you can get an oil seperator on old porsches etc that might help

 

It's to stop oil from coming up the filler pipe and out of the filler cap under extreme driving conditions.

 

I'm going to try a few alterations and a second catch tank for now.

 

I'll look into this further but I know this is quite common on turbo cars.

[welshpug 1,661]

not heard of this on an 8 valve engine, oil vapours are just recycled through the intake tract, it'd take some force and something wrong with the engine or breather system for the oil to be forced up the filler pipe I would have thought.

[rescue dude 0]

not heard of this on an 8 valve engine, oil vapours are just recycled through the intake tract, it'd take some force and something wrong with the engine or breather system for the oil to be forced up the filler pipe I would have thought.

 

 

I'm running Webers.

 

I think all my problems stem from taking the advice from someone who is very knowledgable on Mi16 engines that run a dry sump but not an 8 valve with a wet sump.

 

The one way valve was mentioned to me by the very nice dude from BBM, Stuart? I thought it sounded a good idea and wondered if anyone else used this.

 

I've ordered new breather pipes from BBM and will be fitting those onto a catch tank with a long breather hose coming out direct to air.

[samc 1]

the way a 1 way valve works though is to let something through 1 way and not they other, catch tank will probs sort it. i know when i ran mine on 40s years ago i had the pipe work pretty much standard but had a pipe that cam out of the oil filler(the fatter 1) and over the engine to the passenger side chassis leg and it was just pointing to the ground. i did that as the dipstick kept blowing out and that stopped it lol

[rescue dude 0]

the way a 1 way valve works though is to let something through 1 way and not they other, catch tank will probs sort it. i know when i ran mine on 40s years ago i had the pipe work pretty much standard but had a pipe that cam out of the oil filler(the fatter 1) and over the engine to the passenger side chassis leg and it was just pointing to the ground. i did that as the dipstick kept blowing out and that stopped it lol

 

 

Thats more or less what i'm going to be doing.

[mmt 15]

A one way valve is no good as the engine needs to "breathe".

 

You need a catch tank with a little filter on top. Take the "big" hose at the bottom of the front of the engine and run it to the catch tank. Put some kind of plug into the hose and drill a 8mm hole in the plug(this is enough for the engine to breath and will stop some of the oil to get into the catch tank). Take the breather hose from the head and use a t-peice and connect the rest of the breather hoses to the catch tank.

 

I run this kind of set up on my mi16.

[rescue dude 0]

The one way valve was to be fitted only in the filler pipe below the filler tower. The engine would breathe out of the other outlet in the crank case.

 

At the moment this plan has been put to one side in favour of the original set up but with the top outlet of the filler cap piped up to a catch tank with a pipe from there out to air and the other outlet blocked.