Crankcase Ventilation

Frank Castros · 02-10-2013, 12:50 PM

Any thoughts on this subject for Stock Eliminator applications?

randy wilson · 02-10-2013, 02:15 PM

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, 02:41 PM

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, 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?
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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.

Tylerdax · 02-13-2013, 11:58 PM

would love to have some feed back or "hint" on the correct brake booster check valve!!!!......late 60's???.....early 70's????......I need this junky 275hp 327 of mine to pick up!!!!

Ron Gusack · 02-14-2013, 12:49 AM

The brake booster valve I'm using is a 1970 GM version. It just allows air to go in one direction. I don't know why one would be more beneficial than another, but I'll look into it.

Tylerdax · 02-14-2013, 12:59 AM

i think your refering to a check valve that is screwed into your header.......brakebooster check valve is plastic and similar to a PCV valve in size

Ron Gusack · 02-14-2013, 11:57 PM

Quote:

Originally Posted by Tylerdax

i think your refering to a check valve that is screwed into your header.......brakebooster check valve is plastic and similar to a PCV valve in size

Yes, plastic valve that only allows air to travel in one direction. When manifold vacuum drops to zero, the header is supposed to take over. That's when the valve does not allow air from the intake to go out the header.

I've never run a PCV valve, just the sealed Moroso breathers. Does this setup appear wrong? How do I keep oil from being pulled into the intake?

02-10-2013, 12:50 PM	#1
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 2,641 Likes: 2,154 Liked 2,080 Times in 769 Posts	Crankcase Ventilation Any thoughts on this subject for Stock Eliminator applications?

02-10-2013, 02:15 PM	#2
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 20 Times in 20 Posts	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. __________________ don,t have one

02-10-2013, 02:41 PM	#3
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 958 Likes: 618 Liked 165 Times in 60 Posts	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 __________________ Sean Marconette 84 Mustang 5060 SS/N Last edited by Sean Marconette; 02-10-2013 at 02:43 PM. Reason: Better explanation

02-10-2013, 03:55 PM	#4
Ron Gusack Member Join Date: Feb 2009 Posts: 243 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	#5
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 2,641 Likes: 2,154 Liked 2,080 Times in 769 Posts	Re: Crankcase Ventilation I've seen engines with a shop rag taped around the valve cover breather tube. What's up with that?

02-13-2013, 11:58 PM	#7
Tylerdax Junior Member Join Date: Feb 2012 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Crankcase Ventilation would love to have some feed back or "hint" on the correct brake booster check valve!!!!......late 60's???.....early 70's????......I need this junky 275hp 327 of mine to pick up!!!!

02-14-2013, 12:49 AM	#8
Ron Gusack Member Join Date: Feb 2009 Posts: 243 Likes: 1 Liked 7 Times in 6 Posts	Re: Crankcase Ventilation The brake booster valve I'm using is a 1970 GM version. It just allows air to go in one direction. I don't know why one would be more beneficial than another, but I'll look into it.

02-14-2013, 12:59 AM	#9
Tylerdax Junior Member Join Date: Feb 2012 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: Crankcase Ventilation i think your refering to a check valve that is screwed into your header.......brakebooster check valve is plastic and similar to a PCV valve in size