Crankcase Ventilation

[Ron Gusack]

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]

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]

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!

[Dave Gantz]

I wanted to try an old style road draft tube. Never got a chance. Of course it wouldn't do anything until you're moving, but I thought it might be worth experimenting a bit.

[Tylerdax]

how about a brake booster check valve for vacuum and ventilation???

[eddie c]

Originally Posted by Mark Yacavone

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 ?

Mark, I ran it on a 72 Camaro 350ci 4bbl Q-j ,In H/Stock. Anyway I used a std PCV valve on the one side with all the
other openings closed up and on the other side I used an anti backfire flapper valve that I got from SRD, there were no openings in the system
and the crankcase would hold a good vacuum at idle . I did not and could not run hoses to the headers. This may not have been an optimum
system,but I did experiment with it a couple of times. From what I remember I didnt see any improvement ,that didnt mean it didnt have potential though. ed

[Ed Wright]

I tried the hoses to the collectors at the track (not this car) when that stuff first came out. Never found a thing. I tried a slick little check valve with two PVC valves and a closed crank case on the dyno. Pulled good vacuum to about 5000, then it went away. No pressure as high as we were pulling it then (7700) but no power gain. Finally went to one PVC on one side, and a breather on the other. It's a legal vacuum leak, so you may as well use the highest flowing PVC valve you can find. LOL No more condensation in the valve covers that time of the year either. Didn't back-to-back-to-back it, but appeared to be a couple above 8000. Guess it depends on how well yours would like a larger TB.

[FED 387]

Late 60's-early 70's GM Power brake check valve on the valve cover & then hose to the intake manifold and DO NOT forget to turn the main seals around!!!-- FED 387

[GTX JOHN]

I tried a road draft tube on my 340 about Fifteen years ago and first race they
made me pull it right off!!

[eddie c]

Originally Posted by FED 387

Late 60's-early 70's GM Power brake check valve on the valve cover & then hose to the intake manifold and DO NOT forget to turn the main seals around!!!-- FED 387

Yes, That was another trick,You were supposed to run the front crank seal backwards and also, if possible, turn around your rear main seal.
ed