rikhemi

Hey guys,

Wondering if there is a solution to my breather filter leaking oil. Since I installed a turbo, I vented the valve cover to atmosphere and installed a filter to make sure nothing got inside. But recently noticed some oil leaking to the top of the fuel cover.

I saw this design from another member and wasnt sure if this would work to prevent this from happening to me. If it doesnt, any ideas on how to correct this? Do i need an oil catch can?



Thanks

zeroptzero

I don't know much about routing of pcv and vacuum lines needed for boosted setups on this engine, but I never liked the idea of those small K&N filters on valvecovers. They belong on keychains IMO. Any pressure inside the valvecover will push oil and vapours out of that toy filter. With a boosted setup you probably have more blowby than the average S2K owner, hence the oil leakage out of the filter.

A proper catchcan setup might be ideal, again I don't know how they run them on boosted setups as compared to NA setups. Looks like you have a makeshift catchcan on the pcv hose, might want to ask the guys in the forced induction forum on how to improve upon that.

SgtB

Why vent to atmosphere? It does zero and just gives you another filter to clean. Tie it into the turbo inlet line. That's a fresh air inlet.

K1LL3R 1NS1D3

The reason for adding the filter to the front of the valve cover instead of routing the tube off the front of the VC back to the intake is when boost comes on and the PCV is forced closed, oil saturated air will be "blown by" and out the front VC hose and into the intake and then gumming up inside the intercooler greatly reducing the effectiveness of air to air intercoolers. Sure just a filter on the front of the VC works for preventing oil from contaminating the intercooler but it isnt the most ideal way since the air blowing out of the filter will blow oil all over everything around it. The best setup for a boosted car would be to remove the PCV system entirely, block off the open vacuum ports on the intake manifold and the air intake. Then went the air/blow by from the VC to a catch can that vents to the atmosphere with a minimum of 2 .5"ID hoses connecting the VC to the can. Twin .625"ID or -10AN lines would be ideal for NA and low to mid boost level FI setups. Also baffles or air/oil separators inside the catch can will reduce the amount of oil that will then be blown through the filter.

K1LL3R 1NS1D3

If you google "oil in intercooler" you'll see what im talking about for the need for a catch can and also why not to route the valve cover back into the air intake. Some factory turbo car owners report as much as a quart of oil in their intercooler after as little as 30k miles.

SgtB

Catch can.

K1LL3R 1NS1D3

Heres one I made a few months ago. Look for it in a yellow ap2 in an upcoming issue of Honda Tuning.

rikhemi

So is the setup picture I added in my original post any good? Can I just block the valve cover filter opening instead of having that filter?

K1LL3R 1NS1D3

I would leave the filter as opposed to blocking it off entirely. The hose to the front of the valve cover is intended to bring fresh air into the VC and then it is supposed to exit through the PCV. Just what happens is when the PCV closes the air/oil is forced through the front hose. I would leave the filter on your setup and maybe in the future look into installing a catch can.