...

Go Back   Lateral-g Forums > Technical Discussions > Engine
User Name
Password



Reply
 
Thread Tools Display Modes
  #1  
Old 06-24-2009, 09:17 PM
Zapan00 Zapan00 is offline
Member
 
Join Date: Nov 2008
Location: So Cal
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Default PCV help?

Since getting my 67 camaro on the road, i've had some serious engine pressure issues resulting in valve cover gasket failure and oil leaking out all over the place.

Symptoms:

-doesn't leak a drop of oil at idle.

-Drive down the road at highway speeds (60 mph) 3500ish rpm get back home, open the hood, the dipstick is pushed out about 2 inches and oil spray is all over the hood above the dipstick opening

-I'm pretty sure the drivers side head gasket leaks, but again only after i drive at highway speeds.

-Oil used to pool up in the depressions in the intanke manifold from the valve covers, however, i repaced the valve cover gaskets and it no longer leaks there.

I did alot of research and bought all the stuff to install a PCV system on the engine which brings me to my current issue...

I have a holley 4160 oem# LIST-3310-2 3368. There is no large PCV fitting. there is the vacuum fitting for power assist brakes at the back of the carb...which, for whatever reason (please tell me if you know) is hooked up to a breather on the TH350 trans in the car atm. the other vacuum ports are capped but from my research are the timed spark vacuum source for vacuum advance (mine appears larger than the one on the holley instruction manual i downloaded from holley.com) and the EGR port. The entire choke system has been removed.

Is there any good place for me to hook up the PCV system?

The car runs great except for the loss of oil. I'd rather not spend the money on a new carb if possible.

Thanks for any help you can offer.

-Matt-
SGT USMC
Reply With Quote
  #2  
Old 06-25-2009, 02:08 PM
Formula400 Formula400 is offline
Junior Member
 
Join Date: Jun 2008
Location: Sweden
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Hi!

The PCV should be hocked up between the carburettor and the intake if you do not have a breather installed. (Breather is like an air filter but it's installed where the oil cap normally resides)

I did the same mistake myself a few years back and after it was rerouted correctly it stop spilling it's life blood... (personally do not like the breathers so I never went in that direction)
__________________
Respect is something you can DEMAND but it's really something you have to EARN.

It's much EASIER to blame your FAULTS on somebody else than to blame YOURSELF.
Reply With Quote
  #3  
Old 06-25-2009, 03:26 PM
Zapan00 Zapan00 is offline
Member
 
Join Date: Nov 2008
Location: So Cal
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I tried to set it up with a breather on the passenger side valve cover, the pcv valve in the drivers side valve cover, and the hose from the pcv valve to a port on the bottom of my air cleaner, but it does the same thing (still leaks and pushes dipstick out.)

Should i try using one of the other vacuum hookups on the carb, even though they aren't specifically for pcv?

-Matt-
SGT USMC
Reply With Quote
  #4  
Old 06-26-2009, 12:47 PM
Formula400 Formula400 is offline
Junior Member
 
Join Date: Jun 2008
Location: Sweden
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Zapan00 View Post
I tried to set it up with a breather on the passenger side valve cover, the pcv valve in the drivers side valve cover, and the hose from the pcv valve to a port on the bottom of my air cleaner, but it does the same thing (still leaks and pushes dipstick out.)

Should i try using one of the other vacuum hookups on the carb, even though they aren't specifically for pcv?

-Matt-
SGT USMC
Hi!

Not that I'm an expert but I'd say no... it's better to install a T connection to the power brake assistant port on the carb and install the PCV connection to that I'd say. (It's not optimal but it's better than a breather I've heard)

Or you could install a vacuum pump for the power brake assistant and only have the PCV/tranny install in the carb. (More work though)

Have you cheched that the PCV valve is operational? (At least on a Pontiac engines it requires a set amount of pressure before opening up, assuming you have a PCV valve)

PCV to the air cleaner was dead wrong on my Pontiac Engine but I'm not 100% sure how it is on your engine. (I'm guessing that if you have a PCV valve you will require a set amount of vacuum to get it to open so if you only have it on the air cleaner it will never open up)

I've seen spacers with added vacuum ports. (Factory original spacers)

The cheapest way is to get a T piece or two and hock them all up to the same larg vacuum port on the carb. (Looks ugly but at least you will find out if it will work)
__________________
Respect is something you can DEMAND but it's really something you have to EARN.

It's much EASIER to blame your FAULTS on somebody else than to blame YOURSELF.
Reply With Quote
  #5  
Old 06-27-2009, 01:14 PM
Zapan00 Zapan00 is offline
Member
 
Join Date: Nov 2008
Location: So Cal
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I'll try the T junction with the brake power assist. Thank's for the suggestion, not sure why I didn't think about it myself.

-Matt-
SGT USMC
Reply With Quote
  #6  
Old 06-28-2009, 01:32 AM
olds olds is offline
Member
 
Join Date: Nov 2008
Location: Texas
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Zapan00 View Post
I'll try the T junction with the brake power assist. Thank's for the suggestion, not sure why I didn't think about it myself.

-Matt-
SGT USMC

No power brake vacuum should ever have a T junction. It's one of the only accessories that needs full manifold vacuum.

If it's connected to breather and vacuum from the trans, then you need to use a single vacuum port for the power brakes and another separate vac. port for the trans. You don't need a breather on the trans vacuum either. If you've ran out of ports on the carb, install a fitting in one of the air/vacuum ports of your intake manifold

The 4160 has a few different designs, but yours sounds like it has two large ports and a smaller vac. advance port. If that's the case, the larger port at the front next to the smaller dist. vac. port is the PCV vacuum. The larger port at the back is the power brake booster.

Some 4160 models (for cars w/out power brakes) have two ports - one at the back for PCV and one smaller one at the front for vac. advance or accessories

PCV rids fumes from the crankcase, EGR does the same for exhaust. You don't need any emissions regulation on that car... but DO need PCV or your engine will be building pressure like mad. A few problems you listed sound directly related to not having a PCV valve

It sucks that 10$ could've been saving you headache for a while

Last edited by olds; 06-28-2009 at 01:36 AM.
Reply With Quote
  #7  
Old 07-02-2009, 12:47 AM
BritishGreen68 BritishGreen68 is offline
Senior Member
 
Join Date: Nov 2007
Location: PDX oregon
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Zapan00 View Post
I tried to set it up with a breather on the passenger side valve cover, the pcv valve in the drivers side valve cover, and the hose from the pcv valve to a port on the bottom of my air cleaner, but it does the same thing (still leaks and pushes dipstick out.)

Should i try using one of the other vacuum hookups on the carb, even though they aren't specifically for pcv?

-Matt-
SGT USMC
If you have a breather on the valve cover of any kind that should be enough to not push out a dipstick and have oil spray everywhere, that would be what would happen with no breather at all and a basically sealed up engine. I have ran numerous small blocks with breathers or one valve cover, and pcv on the other and had no issues. I have had a little bit of oil come out of breathers before but barely any, and no where near what your describing. I believe you have bigger issues at hand.
__________________
Chris


Under construction-British Green 68 Camaro-
Reply With Quote
  #8  
Old 07-02-2009, 08:57 AM
GregWeld's Avatar
GregWeld GregWeld is offline
Lateral-g Supporting Member
 
Join Date: Jul 2005
Location: Scottsdale, AriDzona
Posts: 20,642
Thanks: 504
Thanked 1,076 Times in 384 Posts
Default

@ NotNew

This is what I said earlier in this thread... that there must be something else going on here... to have that much 'blow by' to lift the dipstick!

I'd be doing a leak down test on that motor before I did another thing to it...

I've run some pretty potent motors in my day - big and small blocks - and NEVER had that kind of crankcase pressure...

My 427 cubic inch small block will load up the filling in the breather and eventually drip a drop or two of oil on the valve cover... but we're talking about a motor with NO vacuum (8 stack EFI) and NO PCV. I have now (just yesterday as a matter of fact) run a catch can plumbed to a fitting in the fuel pump block off plate... so hopefully that will take the bottom end pulses and keep the breather from loading up with oil fumes. The problem with having no piston / skirt - and a real tight ring pack... I think the compression height of the pistons are 1.100 so there's just not much there to control 'oil'. BUT even at 7000 rpm's -- I've never blown oil out a gasket or lifted the dipstick!!
Reply With Quote
  #9  
Old 07-03-2009, 12:56 AM
BritishGreen68 BritishGreen68 is offline
Senior Member
 
Join Date: Nov 2007
Location: PDX oregon
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by GregWeld View Post
@ NotNew

This is what I said earlier in this thread... that there must be something else going on here... to have that much 'blow by' to lift the dipstick!

I'd be doing a leak down test on that motor before I did another thing to it...

I've run some pretty potent motors in my day - big and small blocks - and NEVER had that kind of crankcase pressure...

My 427 cubic inch small block will load up the filling in the breather and eventually drip a drop or two of oil on the valve cover... but we're talking about a motor with NO vacuum (8 stack EFI) and NO PCV. I have now (just yesterday as a matter of fact) run a catch can plumbed to a fitting in the fuel pump block off plate... so hopefully that will take the bottom end pulses and keep the breather from loading up with oil fumes. The problem with having no piston / skirt - and a real tight ring pack... I think the compression height of the pistons are 1.100 so there's just not much there to control 'oil'. BUT even at 7000 rpm's -- I've never blown oil out a gasket or lifted the dipstick!!
Damn you must run like 8 egr valves on that thing?!?!? lol J/K.. i'm building my 408 small block right now and it has very short piston skirts and i have been planning some sort of breather setup for it because i know it will need a good one.. I like the fuel pump block off to a catch can idea, never thought of that. I run an electric fuel pump too..
__________________
Chris


Under construction-British Green 68 Camaro-
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -5. The time now is 06:09 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright Lateral-g.net