The pcv valve would be where the Oldsmobile breather is.

The vacuum in the middle of the picture


My Engine guy put my engine back together without a PCV valve.
He used up the ports on the fast system.
My question is can I run the PCV valve right from that breather to that vacuum port right there in the middle of the next picture.
convenient because I won’t need a lot of hose.
He said to use the one on the back of the manifold but with everything back there will be a pain in the butt to put it back there.
Thoughts!?!?

 

Think you need one?

 

Just run two open breathers? That’s what I have now.
everything I read says put a PCV valve in. Seems easy enough to do anyways. I already bought the stuff so yes. lol

 

I merged your two identical threads. Yes, the PCV just needs a connection to manifold vacuum, though a larger port would be preferred. The throttle body doesn't have one? A manifold runner will be fine otherwise.

 

Thank You,

I was trying to fix it however was unsuccessful.

I’ll look but he said he used that port for the brake booster and said he used up all the other ones.
A larger port? How about the one way to the front? I don’t know if that’s a runner though or a vacuum.

i’ll have to pull a diagram of this fast throttlebody.

 

The one way in the front is going to be awfully wet - that's the coolant port for a temp sensor. Sorry, but if your "mechanic" can't figure this out, I'd be very skeptical of his skills. This is NOT rocket science.

 

Yeah I better not use that one then lol.
he was insisting that I not do one.

 

Because he can't be bothered. Use a PCV. It will prevent the breathers from spewing oil crap all over your sparkling clean engine.

 

All right there are 2 X 3/8 manifold vacuums on the back.
One of them are capped. One of them runs to the brake booster. I should definitely Be able to use the capped one for the PCV valve correct.
he has the 1/8 ported vacuum in a T running both to the fuel pressure regulator and the distributor. The other 1/8 manifold vacuum looks like it’s running to the transmission.

does this sound right to everyone?
I think he’s just really against me getting a PCV valve. It’s capped off. It’s on the other side but I can fix it.

 

Yeah. This isn't that complex. Basically everything on the car wants to run on manifold vacuum except EGR and evaporative canister purge, which need special timed vacuum ports. Trans, PCV, HVAC, power trunk, vacuum locks, Toro hidden headlights, want to run on manifold vacuum. Vacuum advance is the wild card - either ported or manifold depending on which way runs better.

 

Ok cool. Thank you. I’ll getter done then!!!

 

Just stole this pic from another thread, an option/concept for PCV valve placement, IF you have a turkey tray intake manifold gasket, if not, I don’t know that I would do it that way. Your manifold has an inside corner where the runners meet but still probably doable. Thinking this way so you can leave those nice valve covers unfettered.

If you have the traditional Olds oil fill tube, it can be drilled, a grommet inserted and the PCV valve installed there. That ensures it draws vapor and not potentially oil droplets. If I remember, I’ll get a pic & post it tomorrow.

 

Yeah that’s definitely another take on it. I have the Edelbrock proformer I’ve heard the term turkey tray before but don’t really know what it means. Like a flat spot in the front of the manifold right. I got a nipple on the throttle body now. That is a long hose though and I like the idea of no droplets. I’d atleast like to see what it looks like. The engine did turn out pretty. That’s probably why he didn’t want me to put an ugly PCV valve on it. I do have the old school oil tube

 

Sorry on a plane. Your picture took forever to download. Turkey tray, that is so clean!!! But no I guess I don’t have that kind.

 

You could try one of these.

https://www.oreillyauto.com/detail/c...rg0/4945?pos=4

 

The OP's issue wasn't where to put the valve to the crankcase, it was were to pull the vacuum source. He's got plenty of manifold vacuum taps on that intake. There's no need to make this harder than it needs to be.

 

I’m looking at this as a 2 part effort. Crankcase inlet covered by the present breather, a place for valve to draw from crankcase and a vacuum source need to be completed. There is a suitable nipple on rear of injection unit but as noted, it can be crowded back there, possibly needing a pair of 90* bends to get to daylight, especially if staying out of those nice valve covers with any other appendages.

Here is one other idea that seems to work well though in this case would have to be made to play nice with coolant sensor, could go a little high, or through the gap between sensor and thermostat housing. Sensor could also move to other side of intake. I get that it could go into a runner but that would bother me due to “likely unnecessary ocd.” With a turkey tray gasket crankcase access could be front (like pic in previous post) or rear (if space allows) but require removing the intake for drilling. Either could use the available nipple with appropriate plumbing or use an alternative. If it were mine, I’d use the fill tube, drill & tap a nipple into the front of the intake plenum (center divider be damned! Or at least just a lil room made) and keep things short & neat. Can always just put a grommet & valve into the right valve cover (towards rear for aesthetics) and do it like Olds did. I would want a PCV valve on any street engine and the good news is there are numerous ways to skin this cat.

Good Q raised, would a nipple on one runner load 1 or 2 cyls with effluent, that’s part of my “LUOCD.” Im sure it has been done that way at times but I’m curious. My wife had a direct injected Mini and after walnut blasting the valves every 30k I’m leary about PCV effluent and valves, even valves regularly showered by gas.

 

I assume there is a breather in each valve cover. You only need one - use the other for PCV. To be honest, we've spent more time talking about this than it takes to just do it. I mean, even at the worst case, you can simply replace the oil fill cap with a breather cap.

 

One thing I would like to ask. With a PCV valve, shouldn't you always take take vacuum from the carb or throttle body instead of an intake runner on the manifold? Especially on a throttle body fuel injection system. If you were to use vacuum from the intake runner then all the air from the PCV valve would go into that runner and lean out the fuel mixture for that cylinder. Were as if it came from the throttle body it would even out between all cylinders.

Noel

 

The PCV isn't a huge flow and it isn't constant. Also, reversion in the intake runners causes pulses and mixing that run in both directions. Yeah, it's probably preferable to run the PCV to the base of the throttle body and connect the brake booster to a runner. That's how the factory did it, but in reality it probably won't make a huge difference.

 

Thanks Joe for that explanation. It is always good to learn something new.