Best way to COMPLETELY stop blow by?

[Tommeh]

I am sick of oil blowing through intercooler piping and out my BOV... Its a just messy. I had a Riss Racing oil catch can and it sucked. I bought a ADD W1 Ebay catch can ( http://www.ebay.com/itm/ADD-W1-Black...35b02a&vxp=mtr) and it look very well put together but I still get a lot of oil blow by.


I realize Rob Beck makes an upgraded PVC but I think its the whole cyclone BMW design that is flawed... Have anyone pioneered blocking off or removing the system completely? Would like to read into it.

[Freon]

Some sort of crank case ventilation is required for the engine to operate properly. There's not much getting around it. You can try to filter it as best you can. You should definitely never block off a crank case vent. The pressure will just build and find a way out, probably not in any convenient way for you as the owner.

Older cars would vent straight to atmosphere or into the exhaust, but those are not solutions that I feel are worth looking into.

One suggestion is to place the catch can in a place with fresh air, so it stays significantly cooler than the air and rest of the engine bay. The colder it is, the better it will promote condensation.

The ebay can you linked doesn't seem to be much more than an empty can rather than have any features that would encourage oil and air separation.

I can't find great pictures of the Riss Racing, but found one showing it installed directly above the turbos, which is about as bad as you can get.

[jturboawd]

I used to take it straight to a bung welded on exhaust. That was for a turbo e36 m though. It was a clean solution. I'm not sure why Freon mentions this would be a bad option. I'd be interested to learn more though.

[Freon]

I don't think you can run the bung before any catalyst or it will ruin it, bad for emissions, requires custom welding as it is supposed to exit close to parallel with exhaust flow (not just a bung into the side of the pipe, it's supposed to go near the venturi of the collector as well), reduced scavenging affect on a turbo engine due to lack of a typical NA header collector, etc.