All Things Mk5 > Performance Modifications

Rear PCV

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scopes:
Rear PCV

So would it possible to run the rear PCV to the atmosphere while running the front BSH PCV delete kit ?

I know R-tech do the full delete kit, but I found it smoked too much for my liking, so without routing it into the exhaust to vent to the exhaust, I was “thinking” of adding a catch-can to the rear PCV then vent it to the atmosphere.
I would also be concerned with venting it to the exhaust, that it might end up sucking exhaust gases back into the valve cover…

What would peoples thoughts be on this ?

I would like to know, how safe for the engine, would it be venting the rear PCV out with the front still being vented into the valve cover?

With the turbo being blanked off, it would reduce the amount of oil vapours entering in around the turbo/ turbo discharge pipe / intercooler etc… Could this have any effect on the turbo ?

Dan_FR:
I'm confused..

You've run the R-Tech kit but found it smokes too much? Smoke from the exhaust? If so then you have either fitted the kit incorrectly or have problems since it is the most unrestrictive vent to atmosphere setup you can buy.

Running the rear PCV to atmosphere and the BSH plate on the front instead of the R-Tech one will just cause even more restriction, and adding a catch-can will cause even more restriction again

Either run the R-Tech kit, or go back to 100% original factory fit PCV setup

scopes:
Hi Dan

Partly confused myself ! But was willing to try and test different combinations out to see what I could get to work  best.

Yes, when running the R-Tech delete kit, I found it smoked too much for my liking, the smoke was coming from the two pipes, one attached to the rear PCV pipe and the other from top of the block pipe, crank and cam gasses.
Now which one was causing the smoke, I’m not 100% sure, I would assume it was the rear PCV pipe as fumes/vapour/smoke would rise to the highest point of the engine.

I was thinking about plumbing the pipes in to the exhaust, so the fumes would be sucked out threw the exhaust and not into the engine bay.

Think I had read, that it’s 1 in 10 engines smoke.

Would it be a matter of running longer pipes, further back the car, so the gasses don’t rise from the engine bay ?

When I run the r-tech kit, I did feel the car run smoother… I just don’t like the excess smoke rising from the engine bay.

scopes:
How have you run yours Dan ?

Dan_FR:
Right makes more sense....

Smoke from the two pipes is 100% normal, it is hot, oily combustion blow-by. Mine smokes like crazy after a hard drive on a cold/damp evening. You will get this with any VTA setup. Its not so bad with a catch can, but they do pose a huge restriction which you really don't want when moving away from syphoning/scavenging the gases.

Plumbing the pipes in to the exhaust using the venturi effect would work but will require costly custom fabrication

What i would recommend, which is what i've done (running a home made full PCV delete, so in effect the same as the R-Tech kit) is extend the (few cheap plastic joiners from ebay and some marine) hose and run them down to the exhaust tunnel. Mine are attached to the heatshield and finish roughly where the cat would be (thick marine hose but also covered in heat shielding to be safe). All smells, smoke, gases etc. escape to the rear of the car, whereas before i would get the smell coming in through the vents and front windows and it would make me feel sick

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