PCV in the intake revisited

I searched and read alot about ways to install a PCV in the back of the intake manifold but I didn't see one where the regular push in one was used. They seem to all be a screw in fitting with an inline of some sort. Other than having to drill a big kick *** hole (1 1/4") for the grommet, is there a reason why this shouldn't be done?.

 

the big *** hole is the reason.

 

No reason other than the big *** hole (that's what my wife calls me).

 

1-1/4" hole in the back of your manifold should have answered your question..who in their right mind would want to desicrate a manifold like that for a pcv?

the idea is to hide it..not have it stick out like a sore thumb

 

That's what my girlfriend calls me too!

Mine is back there, push in style, with a Moroso baffled grommet. I had no hesitation drilling the 1-1/4" hole in my $25 swap meet manifold. It breathes in via Offy style filtered breathers on the valve covers.

 

for a 25$ manifold..than maybe..i guess?

 

Your right Randy, the point is to hide it but I doubt that it would be all that visible, it would be between the coil and the dizzy.

 

It looks like there is a tapped hole with a br*** plug in the side of the manifold. Why not put a tubing fitting in that hole? You conuld then run tubing to some spot where the PCV would not be easily seen. There are PCV valves which use a pipe thread connection, or you could make an adapter for a push in type.

 

Yah..guess it would be tuff ta see than..

i still have mine sticking out of my fill tube..so i cant talk about hiding it....but if it works for now..I'll run with it..trying to find a better way..but until than..so be it

 

My earlier post was for the vacuum side of the valve, the engine side needs to connect to the breather pipe in the front of the manifold. You must cap off the breather pipe under that chrome breather so that the PCV will pull through the valve cover breathers.

 

There is an early Corvette Filler tube that had a twist off cap and a 1/4 NPT bung for the PCV valve around 65-66,the one I had was chrome but they might be a rare part.

 

You dont want to put the PCV anywhere that it will **** in oil. There's an awfull lot of oil and oil vapor being slung around by the cam in any V-8, that's why you never see it there.

 

There are numerous OEM examples of the PCV valve being over the lifter valley (Ford Y-Block, etc). It is not a problem with a baffle and a properly functioning PCV valve.

I have a clear tube on mine, and it shows almost no oil.

 

I was initially going to put this intake on my '64 chevy truck and use the vacuum port on the side (with the br*** plug) for the power brakes, the port in the back of the center carb for the PCV and the port in the back of the front carb for the Vacuum gauge. However, until I'm ready to put the 348 tripower in the model A, (likely a year or so) I decided to run this intake on the A. In that car, I only need 2 vacuum ports. The one on the side will be used for the Vacuum modulator on the trans and the one on the center carb will still be used for the PCV. I had bought an inline valve but the damn thing is 3/8 on the outlet side and 1/2" on the inlet. That won't do so I was considering the possibility of the push in. I do have issues with making such a big hole. Ideally, I would like one that screws in on the inlet side that I could just screw into the intake but I don't know if there is such an animal. Then again, there aint much to them, perhaps I can take the plunger out of one and make my own screw-in body to suit my needs

 

thats what i have on mine..hope it works good..not sure about if they are rare..mine could be after market, but it is a nice part

 

I drilled out / tap, hole in intake in the back....worked great BUT, it used a quart of oil to a 100 miles!!!!!

 

You need a baffle under it. I suspect that if you put it in a valve cover without a baffle, you'ld have oil consumption as well.

 

I'll just leave this here: http://www.summitracing.com/parts/MOR-68776

 

I put a push in pcv in the back of the manifold. Being ugly was the last thing I was concerned about. No way to see it behind the carb and air cleaner. It was for sure less ugly than a pcv in the valve cover. My buddy ****ie bent me up a sweet baffle for it. There was no way I was going to ruin a mint set of finned vette valve covers I wanted to run by drilling those. My only complaint was that it didn't work as well as the factory placement in the valve cover. But it did work, to some extent.

 

Bite the bullet and look into honda PVCs they have a bunch of small screw in types (but don't tell anybody where it came from).

OR screw a small ****** into the hole in the manifold and run a length of black fuel hose back toward the bellhousing and hide one of the big***ed ones you already have and plumb it from there.

 

Originals may be hard to find but Most Vintage Corvette supply houses have them listed. You still need breathers on the valve covers though. Unless the manifold is so rare and valuable that modifications would hurt it I'd think drilling and tapping a discrete hole towards the back would be the way to go.

I agree on the oil splash thing to a degree but there are a number of engines that run the PCV valves in the valley or intake from the factory. It wouldn't be that difficult to rig a baffle to the bottom side if desired.

 

could you get away with the PCV in the tube..plumbed back to the center carb base (on a 3x2) and run one breather in one valve cover?

street application..not strip

 

Any part numbers for that honda pvc??

 

How about one of these Fram #FV333



It's for a 3.0L Mitsubishi (Mopar mini-vans) The 1/8" pipe thread goes to engine vacuum and the hose barb end goes to the valve cover or intake valley in this case. This could be hidden quite nicely.

 

You have to consider the idle vacuum as well. You don't want it hanging open all the time.

 

This LOOKS like exactly what I'm looking for. http://www.amazon.com/Novo-W0133-1640963-NOV-PCV-Valve/dp/B001G6HS34 It appears to be made to screw into the engine (valve cover/intake or where ever) and the barb end to vacuum. However, I'm under the impression that all pcv valves are not created equal in that a 2L engine and a 6L engine do not use the same valve and that the valve has to be compatable to engine size. Anyone know if this is true?

 

As I said in my post, the threaded end goes to vacuum and the barbed end to the valve cover or intake valley. I have the van in the parking lot and I looked at it again. Pretty sure it won't work backwards.

PCV's are open to vacuum all the time, that's how they work. If you put one on where none existed, you will probably have to adjust the idle on the engine a bit.

In the other extensive post on this topic, someone brought to light that engine vacuum has more to do with the size of the orifice in the valve than engine size. I.E. a big cam motor uses a different valve than a mild cam motor.

 

Yes, but I was refering to the one in the link on my post.

That makes sense but could engine size make a difference also IE, crankcase volume to be evacuated?.

 

I used the mid sixtys chevy II oil filler with the screw in pcv bung. The corvette one is a little shorter and would actually work a little better. As you can see in the pic, I have a 45 degree fitting at the bung to help the hose line up better with the carb fitting. This system works GREAT with out any oil suction. and no leaks at the valve cover breathers. Chevy also used oil fill tubes with push on fittings for the pcv hose. All these oil fill tubes are available from the corvette repo parts people for around 25-30 bucks chromed.

 

I made a nice looking baffle,obviously poor design..It must hold the oil for the PCV to **** it up!! ( looking back, I do this a lot)...should of used the old road tube/baffle GM had in my 327,and used a PCV in the block!! may look into the corvette set up. then I'll tell every one it has a corvette motor!LOL!