Crankcase Ventilation

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?

eddie c · 02-11-2013, 09:50 PM

Quote:

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 · 02-11-2013, 10:13 PM

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 · 02-12-2013, 01:01 AM

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 · 02-12-2013, 04:52 AM

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

Dave Gantz · 02-12-2013, 08:46 AM

Quote:

Originally Posted by 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!!

I guess it depends on the year of the car? What was the last year they used them, '66?
Anyhow, I thought about that after I posted that. Our car was a '71, so I guess it wouldn't have been legal, either.

Mark Yacavone · 02-12-2013, 12:35 PM

Quote:

Originally Posted by Dave Gantz

I guess it depends on the year of the car? What was the last year they used them, '66?
Anyhow, I thought about that after I posted that. Our car was a '71, so I guess it wouldn't have been legal, either.

That would be 1962 Fed. and 1959 Ca. I believe

eddie c · 02-12-2013, 08:30 AM

Quote:

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

eddie c · 02-12-2013, 11:04 AM

Quote:

Originally Posted by BowtieFroggie

That the turned around rear main seal was a Manley deal when the had the pistons with the rubber o-ring as part of the oil ring

Yes, yes it's all comming back to me now ! Was that for the single ring piston that was being experimented with. I believe one of my friends went to a Manley seminar back then and thought this new style ring ,piston combination was going to be " to die for" ed

02-11-2013, 04:25 PM	#2
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 2,997 Likes: 2,634 Liked 2,746 Times in 969 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?

02-11-2013, 10:13 PM	#4
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Crankcase Ventilation 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. __________________ Ed Wright 4156 SS/JA

02-12-2013, 01:01 AM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,423 Likes: 541 Liked 333 Times in 180 Posts	Re: Crankcase Ventilation 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

02-12-2013, 04:52 AM	#6
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,737 Likes: 2,813 Liked 2,489 Times in 699 Posts	Re: Crankcase Ventilation I tried a road draft tube on my 340 about Fifteen years ago and first race they made me pull it right off!!