PCV, Breathers, etc.

[elmariachi]

I have read most of the posts here about the various options for how to address PCV, as well as the different types of valve cover/catch cans/oil filler/breather setups on FE engines. Problem is, it takes a lot of time to search and soft through all the info. So I thought I would start a thread where users could post pics and details about their setups. I have found the pics here at the 427 Cobra Homepage to be very helpful but I still don't know that I am clear if any one of these setups are better than another. So, if you would care to, post up your pics and/or details on how your cars are setup, maybe this will make a good thread for those of us trying to decide which route to take.

From what I can tell, there are a few basic ways to design the setup:

A riser (Holman-Moody style) on the back of the intake (with or without a breather or PCV valve on the valve covers) like this:



or no valve cover breathers or PCV but a catch can plumbed from the rear of the manifold down to the oil pan, like this:




...or at least one breather or PCV valve on a valve cover, routed over to either the back of the carb or the 45 degree fitting on the intake below the rear of the carb, like here:




... or no breathers or PCV valves on the valve covers, but a vacuum line plumbed from the rear of the manifold up to the base of the carb, like this:




Thoughts, preferences, experiences?

[patrickt]

and vacuum coming from the base of the Holley. Pretty basic, really.

[FWB]

i have the stand-up breather in the rear along with a drivers side pcv in the valve cover plumbed into the fitting between the dual carbs in the intake on the drivers side.

[blykins]

I set all of mine up like Patrick has his set up. Say that 5 times real fast.

[767Jockey]

My builder recommended to me a breather in each valve cover and a PCV valve in the rear of the manifold to the base of the carb. I wanted no breathers or PCV in the valve covers, just a puke tank to the back of the manifold. He says for the street this is no good, because the engine isn't ventilated enough and it starts to build up gunk quickly in the engine. He says the puke tank setup was fine for the comp cars because they were always being torn down, etc. For a street driven car without the constant cleaning and tear down of a race car, it just isn't good. Anyone hear this or otherwise? It's not too late, I'd really like to do a puke tank, but not at the expense of my engine.

[patrickt]

Originally Posted by 767Jockey

It's not too late, I'd really like to do a puke tank, but not at the expense of my engine.

If you really like a puke tank, and don't want the look of the PCV breathers or tube, go for it and don't worry about it. Just change your oil twice a year and use a quality detergent oil -- you're not going to ruin your engine.

[PANAVIA]

on the csx link i get this...

This website has been cancelled.

Click here to go to the 5-minute website builder.

---wtf>?

[elmariachi]

Originally Posted by PANAVIA

on the csx link i get this...This website has been cancelled.Click here to go to the 5-minute website builder.
---wtf>?

The hosting company pulled the site down because some guy was pissing a fit that content there was inconsistent with info on a CSX he was selling. There was a thread in Cobra Talk last week that I assume has been deleted so as to keep CC out of the fray.

[Jamo]

Posted it many times before, but for this thread...

Original setup with the puke tank, including a line from the rearend and trans, a road draft tube ending just below the frame to suck out fumes, and a drain tube back down to the pan. Wire mesh (no pcv) below fitting where tube picks up from back of manifold.

K&N breathers with splash plates underneth both just for added breathing on a big motor/big cam.

It all works muy goodo, and has been for the past five years on the road and track.

[undy]

not all together but...

I run a K&N open element breather in the driver's valve cover, a PCV valve in the passenger's valve cover vacuum sourced from the rear of the intake and last the oil fill tube breather on the passenger side front of the engine. The same setup has worked well in the past to keep oil vapors under control at WOT..

...still saving my pennies for a new fender cover though.

Dave

[bnewell]

B.

[Bill Bess]

It's not rocket science here..in the old days they installed a "road draft tube" off the back of the engine or on the filler tube, worked OK but those old motors always had a lot of blow by and oil going through and the oil fumes just went out the back onto the road.
Probably the most important concept is good ventilation to reduce pressure buildup inside the engine. Valve cover vents are good but will let some oil pass out onto your motor and create a mess especially on long drives.

To me, the best set-up is a negative pressure through a pcv on the back of the intake manifold and into the base of the carb., along with two valve cover cap vents. this set-up seems to work pretty good and doesn't blow out gaskets and cause a mess.

Anyway, this is just my opinion...Bill