Oil breather pipe - valve

[cttan9832]

Hi all,
Just wanted to know is that possible to remove the one way valve and change it to K&N small filter then plug the throttle body hole?

Thanks

[RacingSnake]

Re: Oil breather pipe - valve

Have moved this to it's own thread, on the basis I'm not a fan of reviving 5 year old threads

Interesting question though, and theoretically yes it would work.
My intital concern would be that the MAP sensor might be relying on this additional pressure as part of it's calculations for fuelling etc.
I'm not sure though what purpose/benefit it would bring doing this though, as when under power/boost, the valve prevents the pressure escaping, so no loss is incurred.... I guess it would eliminate the failure of the valve as a weak point though

[cttan9832]

Re: Oil breather pipe - valve

Hi Racing snake,
I think nothing related to the MAP sensor, because the sensor is just measure pressure inside the inlet manifold. Another thing is once the turbo boost the breather valve is close and it is the same picture that i plug the throttle hole. For the top crank case breather, the pressure will escape from the K&N filter.

[RacingSnake]

Re: Oil breather pipe - valve

yep, got the theory, but by revent it back ito the intake when by design they could have vented to air.

as for the MAP, remember that the residual crank pressure WILL go into the inlet manifold, admitedly only on idle or overrun, but even so?

I'm only surmising, I don't actually know.... but why not give it a go and let us know.
like I said, technically and theoretically I see no issues with it.

[cttan9832]

Re: Oil breather pipe - valve

yup, i'll get a try on it.

[Pimust]

Re: Oil breather pipe - valve

FWIW I once plugged a pressure gauge to the crank case ventilation outlet to see if there was actually any over pressure in the crank case when the engine was running but the needle didn't move even 0.1bar from the zero position and this was when I had problems with the piston rings and there should have been over pressure in the crank case then if ever.

[heinkeljb]

Re: Oil breather pipe - valve

If I understand the OP, This is the same as fitting an oil catch tank but without the catch tank. Yes it will work and have not bad effects on the engine, but depending on where the K&N filter is, there might be a layer of oil mist over things!

John

[cttan9832]

Re: Oil breather pipe - valve

i don't think the crank case will pump up the engine oil to the breather pipe but is only the vapour. As heinkeljb said the k&n filter will be a oil mist on the long run, maybe have to clean it frequently.

[Pimust]

Re: Oil breather pipe - valve

How about using a water/oil separator filter for compressed air system as an oil catch tank before the K&N filter? I saw these filters at a local car parts warehouse and they looked tiny enough to fit easily into the engine bay of a smart and the price was about 15 euros. The bowl is made of see through plastic so you can easily check if it has been filled with oil and needs to be emptied each time you check the oil level in the engine.

http://www.about-air-compressors.com/Filters.html

[Evilution]

Re: Oil breather pipe - valve

It will work but the only thing I can see that might affect something is...
When the throttle closes there is a vacuum in the air intake manifold, this is when the upper breather check valve opens and filtered air cycles from the TIK, through the lower breather, through the crank case and into the upper breather. So during vacuum, the crank case is being cleared. When not in vacuum (or if you unplug the upper breather) the vapour will always vent (less effectively) through the lower breather. This will double the amount of dead oil passing through the compressor side of the turbo, more oil in the IC pipes and more oil in the intercooler.

[cttan9832]

Re: Oil breather pipe - valve

how about just remove the upper and lower breather pipe? The lower breather pipe fix with oil catch tank and the upper change to K&n vent filter?

[Evilution]

Re: Oil breather pipe - valve

Yes but I think you'd have a more efficient design by using an inline oil catch tank on the upper breather.

[cttan9832]

Re: Oil breather pipe - valve

yesterday tried to clean the top breather valve by using carb cleaner, finally i found alot of dirt flowing out from the one way valve. I expected the valve has been jam for some time, now i have no choice to remove it and change to a small k&n vent filter.

[cttan9832]

Re: Oil breather pipe - valve

Today i just remove the original top breather valve and change it to the k&n vent filter. After finished installation, i tried to cut off the check valve and investigate. Oh my goodness the rubber inside the valve is very hard and is going to crack that's why there are no sealing at all when the turbo boost. No wonder i got boost pressure drop according to the boost gauge. Now the power is back again

[RacingSnake]

Re: Oil breather pipe - valve

Great stuff, please do post up some pictures of the installation, and let us know how it all runs