Zetec vacuum diagram

[wallisek]

Does anyone here have a vacuum diagram that they can share? I've read a couple posts about blocking off the breather among other things. I'm building a locost and started to tear down a low mileage 2.0 Zetec I picked up. I'll be running twin Weber 45's and I'm curious how to set up the PCV, vacuum, and charcoal canister. (correctly)

[slomove]

You will probably get as many opinions on that one as you get replies. Since the Weber and TB setups are not standard there is no "correct way".

 

I know that a few folks who have had their PCV vent directly connected into the K&N carb air filter box (as has been done on my car and other early setups in the late nineties) experienced a big mess of oil spillage when using hard on track or during autox.

 

A catch tank helped a lot but oil blown out of the PCV vent can still fill it up quickly. I sometimes had to drain it after each track session.

 

I eventually shut off the PCV outlet and now vent only from the valve cover into a small catch tank. Crank case and valve area are anyway internally connected with sizable conduits (feel the pulsating air over the open oil filler neck in idle) and it should not really matter where you let the blow-by fumes escape.

 

The catch tank may need draining of the condensed water and oil mist once a while. Works fine for me but there are surely other methods that work as well.

 

Gert

 

P.S.: Especially with Webers I am not aware of anyone using manifold vacuum in regular operation (actually I do use it for balancing the throttle bodies). The Charcoal canisters I have seen are rather for fuel tank venting but not all Sevens even have them. For that matter my fuel tank vents through a breather filter into the open air.

[wallisek]

Thanks for the info. I'm trying to "think ahead" since I might be moving to a county in my state that requires emissions. I will be using manifold vacuum to feed data into my Megajolt setup. My main concern was due to articles that I've read about PCV being essential for engine life.