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-   -   Crankcase Ventilation (https://www.classracer.com/classforum/showthread.php?t=45724)

Frank Castros 02-10-2013 11:50 AM

Crankcase Ventilation
 
Any thoughts on this subject for Stock Eliminator applications?

randy wilson 02-10-2013 01:15 PM

Re: Crankcase Ventilation
 
Ya, put a dry sump, and vac pump on. Just don't get caught. No, seriously, someone who actually knows the answer will chime in.

Sean Marconette 02-10-2013 01:41 PM

Re: Crankcase Ventilation
 
Good ring and valve cover seal with a sealed crankcase breather, and its worth it on my car. There is a thread about vacuum check valves, that is worth searching for.
Sean

Ron Gusack 02-10-2013 02:55 PM

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]http://i246.photobucket.com/albums/g...eCapitol-1.jpg[/IMG]
[IMG]http://i246.photobucket.com/albums/g...sket4500-1.jpg[/IMG]

Frank Castros 02-10-2013 06:42 PM

Re: Crankcase Ventilation
 
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 09:31 PM

Re: Crankcase Ventilation
 
Quote:

Originally Posted by Frank Castros (Post 368611)
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 10:49 PM

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

Frank Castros 02-11-2013 11:47 AM

Re: Crankcase Ventilation
 
How about the use of PCV Valves?

Mark Yacavone 02-11-2013 02:01 PM

Re: Crankcase Ventilation
 
Quote:

Originally Posted by eddie c (Post 368653)
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 03:25 PM

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?


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