The 1,000,000th post on PCV valves... ok not really - Team Camaro Tech
Engine General Engine Discussion.

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 38 (permalink) Old Mar 27th, 11, 10:32 PM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
The 1,000,000th post on PCV valves... ok not really

I just spent the last four hours reading about PCV valves and how they work. It seems like everyone's setup is different. Some guys are running different air cleaners or valve covers or oil fill tubes. Let's not even start to mention the dreaded Road Tube.

Well here is my question. Let me start with the setup I am going to run. I have a 67 block and a 67 intake. The valve covers are the scripted type with no holes for anything. The oil fill tube is from what I believe to be the "open" system, that is there in NO bung on the side of the fill tube for the PCV. My block has been pluged where the adapter would go. So I need to resolve the dreaded PCV issue.

From different posters on this subject (Sauron, JohnZ, and Vintage 68) I think that I may have a better grasp on where I need to go. The PCV system needs to have the intake side and an exhaust side (I think).

I am thinking of the intake side for my setup would be the regular oil fill tube with the vented cap (standard "open" 67 system).

The exhaust side I was thinking that I should unplug the hole by the distributor (sp) and insert the "adapter" (whatever the hell that thing is) and run that to the vacuum to the Quadrojet carb that I am going to run that I don't currently have.

Will this solve the dreaded PCV question? The problem is I am not sure of where to get the "adapter" that would go on the back of the engine. I did read one post that talked about a "dixie cup".... where would I get that?

Also I am under the impression that there are different kinds of PCV valves? which one would I need? part number? can I go to autozone and get it or sould I get a "Quality" one from a speed shop.

This is for a 67 Camaro. I am trying to get this as close to factory as possible so cutting hole into the VC are not an option. I could cut into the air cleaner but I think that that is done on the "closed" system, reverse PCV.

Am I close to what I need to do to get this engine to breath properly and not blow gaskets and stuff...

Thanks for reading my long winded question.....Seriously I have a headache from reading all these posts on this subject. I went through five pages of past PCV stuff..... I think I need a beer..

Thanks....
Brandan-

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
Sponsored Links
Advertisement
 
post #2 of 38 (permalink) Old Mar 28th, 11, 02:46 PM
Senior Tech
Wes
 
Join Date: Dec 2003
Location: Leander, TX
Posts: 2,762
Re: The 1,000,000th post on PCV valves... ok not really

Your 1967 didn't originally have a PCV valve. It indeed, used the 'road draft' tube set-up. Chevy went to the closed PCV system (which used a PCV valve) in 68.

You can use the original set-up for crankcase ventilation for your 67, but if it were me, I would find some 1968+ SB valve covers and run a PCV system that uses the valve.

You can remove the oil fill tube and block the opening on the intake manifold with a 1.25" (I think) freeze plug. Same with the draft tube in the back of the block.

Then you can get a PCV valve and grommet for your driver's side valve cover and either a breather (can be messy) on the passenger's side VC, or plumb it to your air-cleaner if it has a provision.

The closed PCV system has many advantages; reduces crankcase pressure and oil leaks, does a muuuch better job of removing harmful blowby vapors from the crankcase, and there's no mess under the car where the draft-tube delivers it's vapors.
Straight-line-69 is offline  
post #3 of 38 (permalink) Old Mar 28th, 11, 06:56 PM
Team Member
John
 
JohnZ's Avatar
 
Join Date: Sep 2000
Location: Washington, Michigan USA
Posts: 7,728
Re: The 1,000,000th post on PCV valves... ok not really

Quote:
Originally Posted by Straight-line-69 View Post
Your 1967 didn't originally have a PCV valve. It indeed, used the 'road draft' tube set-up.
Nope. The "road draft tube" arrangement disappeared after 1962. '67 V-8's used a "partially-closed" PCV system, as shown in the '67 Assembly Manual (UPC 6, sheet C5). They used the "dixie cup" adapter on the rear block vent hole, with a hose to an elbow that screwed into the back of the 2-barrel carb; that elbow had a calibrated orifice in it (usually .090") to meter the flow of crankcase vapors from the "exhaust" side of the system instead of a PCV valve.

The "intake" side of the system was the vented oil fill cap on the oil fill tube.

The L30 and L48 (Q-Jet carbs) also used the "dixie cup" adapter, but its hose had an in-line PCV valve with the other end of the hose connecting to the nipple on the front of the carb base.

With RPO K-24 (Positive Ventilation), a different rear vent tube was used at the block rear vent hole, which connected via a hose to the air cleaner base for the "intake" side of the system. For the "exhaust" side, they used a different oil fill tube with a bung that accepted a screw-in PCV valve, a sealed cap, and a hose from the PCV valve to the carb. The 2-barrel used an elbow (with no calibrated orifice) at the back of the carb base, and the L30 and L48 (Q-Jet) used a hose to the nipple on the front of the carb base (Assembly Manual, section K24, sheet A2).

The K-24 approach will provide a fully-functioning PCV system without having to alter the valve covers.


JohnZ
CRG
JohnZ is offline  
 
post #4 of 38 (permalink) Old Mar 28th, 11, 07:20 PM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: The 1,000,000th post on PCV valves... ok not really

Great explanation, JohnZ.

Brandan, you can purchase the PCV valve for a 67 327 at just about any parts store. I bought mine at Autozone. I think I have an extra dixie cup. I'll check for you next time I'm in the garage. Then a couple pieces of hose and a vented oil fill cap and you are good to go.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #5 of 38 (permalink) Old Mar 28th, 11, 10:41 PM
Senior Tech
Wes
 
Join Date: Dec 2003
Location: Leander, TX
Posts: 2,762
Re: The 1,000,000th post on PCV valves... ok not really

JohnZ is right,..I skipped a generation in the evolution of the PCV System.

On this page, click on the thumbnail of the diagram that shows what JohnZ is describing:

http://www.zip-corvette.com/ProductD...L2-SR&CTitle=&
Straight-line-69 is offline  
post #6 of 38 (permalink) Old Mar 29th, 11, 10:38 AM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
Re: The 1,000,000th post on PCV valves... ok not really

Guys thanks for the replies.... I don't think that I mentioned that I was going with the 4 barrel quadrojet. With that being said, the "dixie cup".. is that something that I can purchase from say Autozone or somewhere else?? (in case Tom doesn't have one). I did a search on ebay just to see what it looked like and came up empty, just real paper dixie cups...

I did see Johns post from a few years ago that showed a picture if it installed. I did find a part on Rick's.. not sure if that is what I am missing.

Here is the link http://www.rickscamaros.com/camaro-c...pump-1967.html Is this the part that I am missing? or will it work..???

My plan was to keep the "intake" side of the PCV with the vented oil fill tube.

The "exhaust" side... well that is my dilemma. I am kind of confused of what I need to do. I am thinking that I need the Dixie cup (like John is saying) that should go to the base of the quadrojet 4 bbl carb. Does this sound right? I asked my engine builder and he was not familiar with the Dixie cup...

Brandan-

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
post #7 of 38 (permalink) Old Mar 29th, 11, 10:59 AM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: The 1,000,000th post on PCV valves... ok not really

Yes, you have it right. The one shown in the link is too big, mine has a much shorter pipe only 2 inches or so, as does my extra one. If you have the AIM you can see it on one of the drawings for L30. I just don't have it in front of me right now...Dixie->hose->pcv valve (held by a bracket to an intake bolt)->smaller hose-> front base of QJet.

I don't see the dixie cup in the NPD catalog either so I doubt you can get that at AZone.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #8 of 38 (permalink) Old Mar 29th, 11, 11:22 AM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
Re: The 1,000,000th post on PCV valves... ok not really

Ok, so I need the dixie cup in order to get this to work....


Exhaust side: Dixie cup from block to fitting on quadrojet should do the trick.....


Tom did you find your extra? and if so PM the details... My engine is on hold until I get this resolved.

Is there a different name for the "dixie cup"? Is this a GM part?

Thanks Brandan-

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
post #9 of 38 (permalink) Old Mar 29th, 11, 11:38 AM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: The 1,000,000th post on PCV valves... ok not really

I'll check tonight. I know I have one if I can find it.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #10 of 38 (permalink) Old Mar 29th, 11, 11:41 AM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
Re: The 1,000,000th post on PCV valves... ok not really

Any idea where this part would come into play if at all???


http://cgi.ebay.com/ebaymotors/327-2...item2a0e9440d4

Thanks Tom, Please let me know.... :-)

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
post #11 of 38 (permalink) Old Mar 29th, 11, 11:42 AM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Re: The 1,000,000th post on PCV valves... ok not really

Quote:
Originally Posted by Brandan View Post
... Is there a different name for the "dixie cup"? Is this a GM part? ...
Group 1.762 - Tube; Adapter assembly
Discontinued from GM dealers years ago ...

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vintage 68 is offline  
post #12 of 38 (permalink) Old Mar 29th, 11, 12:03 PM
DjD
Retired
Dennis
 
DjD's Avatar
 
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,486
Garage
Re: The 1,000,000th post on PCV valves... ok not really

I have seen a small filter/breather used on the back of the block in place of the tube assembly to the air cleaner, along with the sealed cap breather tube with a pcv valve connected to the vacuum port on the carb base. It isn't factory but you wouldn't have to molest your valve covers and would provide a functional PCV system.

...Dennis

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


"Don't take life so serious, you won't get out alive..."
DjD is offline  
post #13 of 38 (permalink) Old Mar 29th, 11, 12:12 PM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: The 1,000,000th post on PCV valves... ok not really

Quote:
Originally Posted by Brandan View Post
That part lives in the lifter valley and keeps oil from being sucked up. If you block is original you should have one there. I had to take mine out when using my Performer intake.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #14 of 38 (permalink) Old Mar 29th, 11, 01:02 PM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
Re: The 1,000,000th post on PCV valves... ok not really

Quote:
I have seen a small filter/breather used on the back of the block in place of the tube assembly to the air cleaner, along with the sealed cap breather tube with a pcv valve connected to the vacuum port on the carb base. It isn't factory but you wouldn't have to molest your valve covers and would provide a functional PCV system.
Dennis, I think that is the "closed" system that John was referring about. I know that it is an option but I am more set up for the "open" system. Just missing the "dixie" cup.

Thanks, at least I have options. A few days ago I thought I was toast and didn't have a direction to go. I swear this site has helped me out a number of times


Brandan-

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
post #15 of 38 (permalink) Old Mar 29th, 11, 01:06 PM Thread Starter
Gold Lifetime Member
 
Join Date: Mar 2008
Location: Port St. Lucie, FL
Posts: 907
Re: The 1,000,000th post on PCV valves... ok not really

Quote:
That part lives in the lifter valley and keeps oil from being sucked up. If you block is original you should have one there. I had to take mine out when using my Performer intake.
Jeezz.. I am missing that part as well...... I think I can skip it and not hurt anything. I have been working on this car for four years now and I am so ready to drive it......


John, again your knowledge is greatly apprecitated on this.....thank you



Brandan-

1969 Chevrolet Camaro 396 SS X-66

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


1967 Chevrolet Camaro RS Convertible

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brandan is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome