Quote:
Originally Posted by Gaz64
That's not how to plumb for PCV.
Fresh filtered air needs to enter the crankcase, either via a filtered oil cap, or hose to a carb filter base. The other side of the engine then needs a PCV plumbed to manifold vacuum.
On a Webered V8, these needs to be plumbed to ALL inlet runners, either via a spacer under each carb, or individual feeds drilled and tapped into each runner. I have mine plumbed under the manifold.
Gary |
Gary, it doesn't need to be plumbed under "all" intake runners. That doesn't accomplish anything more that having it plumbed under ONE intake runner (at least for the purposes of meeting the regulation). All you need to to is provide a way to burn crankcase gasses via internal combustion, and provide filtered air to the crankcase in times of vacuum. You can (and I did) do that by tapping a spacer plate under a single weber, with a line going to the PCV in one valve cover. Then, you tap into the bottom of an enclosed air filter over the same, or any other carb, with a line going to the opposite valve cover (or the
oil filler cap which may have a connection for just this purpose). This meets both the intent, and letter of the law. I had no problem passing with this setup.
Gary, I see that you're from Australia. You guys have all kinds of crazy regulation when it comes to cars. I assure you that the PCV only needs to be able to expel its gasses in such a way that they are combusted within the engine. One line into a common manifold...or any manifold (in the case of individual throttle bodies) will accomplish the task. I suppose one could argue about the effective vacuum not being consistent over a single cylinder, but the webers cover two cylinders, and I suppose the authorities think that's enough. At least here in the US of Kalifornia.