I am putting a turbo kit on my DA. It is a stock LS motor. I originally had the turbo kit on a B20 engine that was in my car, i ended up pushing it to hard on a bad tune and cracked a sleeve. My question is with the pcv system on the LS, it has the black box on the back of the block. The B20 didn’t have that. I have 2 breather tubes coming off the front of the valve cover that go to a catchcan. I was wondering what I should do with the black box, should I just put a breather filter on where the hose comes out of it that goes to the pcv valve and then cap off the port on the intake manifold? Any suggestions would be appreciated.
i suggest you remove the box and tap the hole. then tread in a brass fitting with a barb fitting. then run a tube from the “black box” to your catch can set-up.
is there anyway I can just cap off the hose that goes to the pcv valve considering my valve cover is already setup to relieve crankcase pressures? If I did it that way wouldn’t it just be like the B20 engine that doesn’t have the black box?
its better to have the venting as close to the crankcase as possible. pressure equalization is not instant, so if your only eventing from the top then the bottom end is going to have a little more pressure in it compared to the oil valley in the head.
when you had it on your b20, i would have suggested you drill and tap one or two fittings into the bottom of the block that open to the actual crankcase. bring the total vent holes to three/four, and running all tubes to the catch can set-up.
if you have a vacuum set-up (via pump or the like) then you could probably get away with just coring it. but if your going to rely on the pumping action of the crank to “push” the air out of the crankcase, it better to have a good amount of ventalation.
I agree with 91DB1T. In a perfect engine you want a slight vacuum in the crankcase. Honda’s pcv’s try to do that without venting vapors to the atmosphere, so they route directly to the IM. Best of both worlds, emissions AND crankcase venting CREATED by the vacuum of the manifold.
You’re boosting, so venting ANY pressure in the crankcase is a priority. I would keep what you already have, and set up something similiar in the rear as well. I would NOT cap it off. The first place boost goes after it squeezes past the rings is the crankcase. Ventilation here is perfect. If i was in your situation, i would move the PCV valve down to this factory location and plug the hole on top of the valve cover. I personally think the 96+ B18B and B20s have a terrible PCV system. The older “black box” systems directly on the block are a lot better IMO.
