Crankcase Ventilation

Ron Gusack · 02-10-2013, 03:55 PM

I can only pull a vacuum in the crankcase by using manifold vacuum. When things are right, I can get about 6" of negative pressure. If I just use the headers, I get no movement on my vacuum gauge. I recently discovered that my oil separator breathers weren't getting all the oil out of the vacuum line to the carb. I could see some oil residue on the carb gasket under the carb (see picture 2). I'm hoping a vacuum pump style separator will cure the problem. I use the old Jenkins/Moroso pan evac system. Does anybody still use this system?
[IMG]

[/IMG]
[IMG]

[/IMG]

Frank Castros · 02-10-2013, 07:42 PM

I've seen engines with a shop rag taped around the valve cover breather tube. What's up with that?

Ron Gusack · 02-10-2013, 10:31 PM

Quote:

Originally Posted by Frank Castros

I've seen engines with a shop rag taped around the valve cover breather tube. What's up with that?

Engines with lots of blow by build pressure in the crankcase and if there's enough, a mist of oil will be pushed out of the valve cover breather. The rag was supposed to catch the oil. I haven't seen that done for many years.

eddie c · 02-10-2013, 11:49 PM

I played around with a vacuum balance system on my stocker back
in 1975. Bill Jenkins was experimenting with it and the guys at SRD
who were neighbors ,were selling some of the components to make
systems. I still have some of the origional parts that I got from SRD.
I ran a vbs for a short time ,but I never really gave it a good test.In theory
they are supposed to improve H.P. ed

Frank Castros · 02-11-2013, 12:47 PM

How about the use of PCV Valves?

Ron Gusack · 02-11-2013, 04:31 PM

Quote:

Originally Posted by Frank Castros

How about the use of PCV Valves?

I didn't think a PCV valve would remove oil vapor from being sucked into the manifold.

Mark Yacavone · 02-11-2013, 05:33 PM

Quote:

Originally Posted by Frank Castros

How about the use of PCV Valves?

Frank, always use a PCV. It helps to keep some of that expensive light weight oil inside the engine..(No rags needed)
I doubt you would still pull any vacuum at the end of a run though.That's why you need the header hoses and valves.
Of course,..not legal in Stock

Frank Castros · 02-11-2013, 06:02 PM

Thanks Mark.

I found this image; http://www.aa1car.com/library/pcv.gif

My primary interest in this subject it to maximize ring seal and of course not waste any of those valuable shop rags!

Mark Yacavone · 02-11-2013, 03:01 PM

Quote:

Originally Posted by eddie c

I played around with a vacuum balance system on my stocker back
in 1975. Bill Jenkins was experimenting with it and the guys at SRD
who were neighbors ,were selling some of the components to make
systems. I still have some of the origional parts that I got from SRD.
I ran a vbs for a short time ,but I never really gave it a good test.In theory
they are supposed to improve H.P. ed

I assume you meant Super Stock? Stock Elim. was very restrictive back in '75.
I doubt you would have gotten away with anything more than an OEM type PCV back then..
Unless you were just using a Stocker for testing purposes ?

Frank Castros · 02-11-2013, 04:25 PM

What I'm personally attempting to gain and learn from my initial question, having very limited knowledge of the subject in general and it's application to Stock Eliminator rules is, what is the current set up for the heavy hitters?
Also why does N.H.R.A. not allow valve cover breathers to be evacuated into the header collectors in Stock?

02-10-2013, 03:55 PM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Re: Crankcase Ventilation I can only pull a vacuum in the crankcase by using manifold vacuum. When things are right, I can get about 6" of negative pressure. If I just use the headers, I get no movement on my vacuum gauge. I recently discovered that my oil separator breathers weren't getting all the oil out of the vacuum line to the carb. I could see some oil residue on the carb gasket under the carb (see picture 2). I'm hoping a vacuum pump style separator will cure the problem. I use the old Jenkins/Moroso pan evac system. Does anybody still use this system? [IMG][/IMG] [IMG][/IMG] Last edited by Ron Gusack; 02-10-2013 at 03:58 PM. Reason: added pic

02-10-2013, 07:42 PM	#2
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 3,009 Likes: 2,693 Liked 2,765 Times in 978 Posts	Re: Crankcase Ventilation I've seen engines with a shop rag taped around the valve cover breather tube. What's up with that?

02-10-2013, 11:49 PM	#4
eddie c Junior Member Join Date: Jul 2011 Location: Southeastern Pa. Posts: 53 Likes: 0 Liked 0 Times in 0 Posts	Re: Crankcase Ventilation I played around with a vacuum balance system on my stocker back in 1975. Bill Jenkins was experimenting with it and the guys at SRD who were neighbors ,were selling some of the components to make systems. I still have some of the origional parts that I got from SRD. I ran a vbs for a short time ,but I never really gave it a good test.In theory they are supposed to improve H.P. ed

02-11-2013, 12:47 PM	#5
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 3,009 Likes: 2,693 Liked 2,765 Times in 978 Posts	Re: Crankcase Ventilation How about the use of PCV Valves?

02-11-2013, 06:02 PM	#8
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 3,009 Likes: 2,693 Liked 2,765 Times in 978 Posts	Re: Crankcase Ventilation Thanks Mark. I found this image; http://www.aa1car.com/library/pcv.gif My primary interest in this subject it to maximize ring seal and of course not waste any of those valuable shop rags!

02-11-2013, 04:25 PM	#10
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 3,009 Likes: 2,693 Liked 2,765 Times in 978 Posts	Re: Crankcase Ventilation What I'm personally attempting to gain and learn from my initial question, having very limited knowledge of the subject in general and it's application to Stock Eliminator rules is, what is the current set up for the heavy hitters? Also why does N.H.R.A. not allow valve cover breathers to be evacuated into the header collectors in Stock?