I have a motorcraft 2150 carb on a 390 engine. I know isn't for my year truck.

I am coming from an autolite 2100 that needed a pcv spacer that is run from the breather.

When I got the 2150 I put it on with the spacer on there and plugged the pcv port on the carb.

I could not get the car to run more than 5 seconds before dieing. Huge vacuum leak! Found out its on the spacer by trying just using the thicker gasket below the carb no spacer car started and idled fine.

Is it OK to run like this? If not where can I get just a normal spacer for the 2150?

Thanks

 

The purpose of the PCV is to evacuate crankcase gases/airborne oil mist and have it burned as part of the combustion cycle. Deleting the vacuum (ala the PCV, hose, and spacer) results in the oil becoming dirtier faster plus the carb has to be adjusted to exclude the air sourced from the crankcase.

There is more benefit to keeping a functioning PCV than deleting it in my opinion.

 

The down side to running one is you will get more deposits on the valves, which lowers performance and increases fuel consumption.

 

Sorry I forgot to add that I would run a new line from the breather to my 2150's pcv in the back, the one I had plugged when I had the spacer on it.

 

RoughIdle, you mean the downside to running a pcv line or running a spacer?

 

The line, I always get rid of them and replace it with a breather in the valve cover. I always run a spacer as well, a solid one with no vaccum lines on it, better atomization of the fuel.

 

I always thought the pcv line from the breather was for better fuel economy, like recycling old fumes. Any ideas where to buy a spacer then? I've only found all open ones like for 4 barrel.

 

Burning crankcase gasses will do more harm than good for fuel economy, the only reason that stuff was ever put on from the factory is because of government being paid off by tree huggers. You should beable to plug the hole in your factory spacer, just make sure it is air tight. Otherwise check with a local parts store or Summit, I know I have seen them before.

 

A PCV valve (and its associated routing) is absolutely critical for the health of your engine. Do not remove it under any circumstances.

Whether you use a stand-alone breather on the opposite valve cover or run the breather line up to the air cleaner and install the breather there is up to you, but do not remove the system altogether.

 

To answer the original question, as long as you are running a PCV system, it doesn't matter whether you hook it up at the base of the carb or with the spacer.
The spacer you are referring to was just PCV correct? It didn't have an EGR valve bolted on the back.

 

I guess that explains the user ID?.... and likely the oil-stained valve covers and intake which is the result if crankcase pressure pushing oil and oil mist out the breathers and valve cover grommets. To each their own...

But I concur with FMC400....

The alternative to an OEM PCV system is a crankcase evacuation system straight to the collectors with check valves as pictured below.



Installed:


The write-up: Crank Case Evacuation - Ford Muscle Forums : Ford Muscle Cars Tech Forum

 

Anybody else old enough to remember "road draft tubes"? These were the forerunner of the PCV system.
If you had a really worn engine, going down the road was quite a "cloudy adventure" with smoke (crankcase vapors) pouring out of the draft tube.

 

OK so stock PCV I can easily run that into the carb no problems... Where can I get a 2 barrel spacer? Can I use one of the fully open ones? Like no circles on it, just square open.

 

That's how my dad told me his dad taught him how to drive - try to keep straight by focusing on the grime down the center of the road, from the road draft tubes. A little ways before my time.

 

Not very old, but I've seen my fair share of them. I'm sure the EPA would have a stroke if they saw one on anything >'60

For anyone scratching their head, the road draft tube can be seen coming off the valve cover on this Slant-6.