Engine plumbing

***i have read the other threads just looking for another prospective***

I have a pair of valve covers at the moment with no holes in them and i would like to keep them that way; im going for the clean and simple look...

I have planned for a PCV to be fitted into the rear of the manifold (at the base of distributor in a machined baffle) and into the carb.. Obviously what i need is an air intake in some form which im hoping can be done through the below device



If this will not suffice can anyone suggest any other method?!

As i have already machined the manifold for the PCV fitment under the distributor is it acceptable to do a similar type of thing at the front whereby i run a tube directly into the manifold from the base of my aircleaner? Would this work as an alternative?

By the way the engine block is a 94 ZZ4 and the manifold is an Edelbrock victor jnr.....

Thankyou in advance for your help!

 

You're talking about what looks like an oil filler tube front right of engine?

Crankcase air that low down can have a lot of oil droplets mixed in with the air and they can be hard to control.

Is there room at the back of the block, above and to one side of bellhousing center to bore a hole, install a custom made fitting and adapt your PCV valve there?

Then a hose or braided line to the carb base.

Somewhere along the line you need to introduce clean, filtered air into the crankcase.

I don't care for pulling air from the - in most cases - poorly filtered oil filler caps and use a line into the clean air area of the air filter.

You'll need some kind of baffle that admits air and no oil droplets inside the valley that goes to your PCV setup.


One problem with some engines is there is a large opening between valley and crankshaft area and that creates a lot of oil droplets flying about.
True with my 462" Buick, the bottom of the valley is virtually wide open and I've done several things to control the oil laden air in there.

In fact, there's an aluminum oil/air separator up on the firewall and the PCV valve is on top of that.

Controlling the oil/air mix is better, but an improved valley baffle, bathtub style gasket and epoxying metal screens over the large valley bottom holes should do the trick.


The big test for your PCV/Crank breather system seems to be:
Cruise along for a while, highway speeds running 3000 rpm and higher - within reason - then nailing the throttle to see if the oil laden air is being controlled or simply being pumped through the intake manifold where it lays down a cloud of blue oil smoke.

BB Buicks don't do well in this area and that's why the extra work and experimenting.


Another check to see how the PCV is doing is to see if you lose oil over a 50-100 mile highway run, no leaks are evident and compression is ok.

Here's a schematic that may help.