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Old 02-10-2013, 11:50 AM   #1
Frank Castros
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Default Crankcase Ventilation

Any thoughts on this subject for Stock Eliminator applications?
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Old 02-10-2013, 01:15 PM   #2
randy wilson
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Default 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.
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Old 02-10-2013, 01:41 PM   #3
Sean Marconette
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Default 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.
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Last edited by Sean Marconette; 02-10-2013 at 01:43 PM. Reason: Better explanation
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Old 02-10-2013, 02:55 PM   #4
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Default 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 02:58 PM. Reason: added pic
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Old 02-10-2013, 06:42 PM   #5
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Default Re: Crankcase Ventilation

I've seen engines with a shop rag taped around the valve cover breather tube. What's up with that?
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Old 02-10-2013, 09:31 PM   #6
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Default Re: Crankcase Ventilation

Quote:
Originally Posted by Frank Castros View Post
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.
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Old 02-13-2013, 10:58 PM   #7
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Default 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!!!!
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Old 02-13-2013, 11:49 PM   #8
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Default 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.
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Old 02-13-2013, 11:59 PM   #9
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Default 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
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Old 02-14-2013, 10:57 PM   #10
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Default Re: Crankcase Ventilation

Quote:
Originally Posted by Tylerdax View Post
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?
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