PCV Air/Oil Separator Install Project - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rn2fine · 04-25-2004, 05:41 PM

In addition to my manifold project this weekend I am installing an air/oil separator inline between my PCV valve and carburetor. I did a lot of research on the net and discovered that they are pretty popular and come stock on some cars such as Volvos. My PCV valve has been sucking some oil, through the baffles, and the oil ultimately makes its way through the intake system, even though I have baffles installed in the valve covers. My intake runners were oily and the back side of the intake valves on my new heads were all goopy (could be valve seals but they are new ???) Below is a picture of the separator. It is made by a company called Greddy out of California. It is the only air/oil separator that I have found for aftermarket automotive use. I found several others made for piston driven small aircraft.

Johnny Outdoors · 04-25-2004, 05:53 PM

ONCE YOU HAVE THAT MOUNTED IS THERE AN EASY WAY TO CLEAN IT OUT?
IS THERE A SCREEN INSIDE OR JUST BAFFLES?
IF YA DONT MIND WHAT WAS THE COST?

rn2fine · 04-25-2004, 06:41 PM

The mounting holes are on the back. There are three holes on the side as seen in the picture. One is for a drain plus (it came in the box) and the other two holes hold a clear tube that indicates how much oil has been trapped. Ironically it is hollow inside. When the air makes a sharp turn the oil goes down into the cavity due to it's weight. I first learned about them through some Corvette on-line forums where owners were talking about them quite a bit. I have seen many designs. Some people build their own, some pack them with material. I will see how this design performs and let everyone know. It sells for roughly $85 on various sites throughout the net. I bought directly from Greddy for $99. Below are some sites about separators. The last one is the Greddy site.

http://www.y8s.com/celica/air-oil/

http://www.autospeed.com/cms/article.html?&A=0338&P=1

http://www.andair.co.uk/system/index.html

http://www.greddy.com/products/produ...0Catch%20Tanks

**smitty62** · 04-25-2004, 07:22 PM

The pcv valve couldn't suck oil past the valves unless the guide & seals were worn. Suspect your separator will end up with the same gook.

Johnny Outdoors · 04-25-2004, 07:28 PM

THANKS FOR THE INFO
ILL CHECK OUT THE LINKS

tomsC10R · 04-25-2004, 10:55 PM

What are the dimensions?

rn2fine · 04-26-2004, 12:56 AM

7 inches tall
2 1/2 inches wide
3 inches deep

tomsC10R · 04-26-2004, 01:18 AM

Thanks

I might just have to get that if the budget allows...

Hey, one more question. Are those barb fittings removable? Possibly pipe thread holes? It looks like they are... I'd like to run AN line if I decide to get it.

Thanks again,
Tom

rn2fine · 04-26-2004, 01:30 AM

The barb fittings are removable. However, I believe that they are metric. They come with either 9mm or 15mm barbs. I chose the 9mm barb because it is closest to the size 6 braided Russell fuel line that I use for my PCV. Greddy sells these things mostly to people with hopped up imports. Greddy specializes in stuff for Hondas and such.

04-25-2004, 05:41 PM	#1
rn2fine Registered User Join Date: Jan 2004 Location: Arizona Posts: 157	PCV Air/Oil Separator Install Project In addition to my manifold project this weekend I am installing an air/oil separator inline between my PCV valve and carburetor. I did a lot of research on the net and discovered that they are pretty popular and come stock on some cars such as Volvos. My PCV valve has been sucking some oil, through the baffles, and the oil ultimately makes its way through the intake system, even though I have baffles installed in the valve covers. My intake runners were oily and the back side of the intake valves on my new heads were all goopy (could be valve seals but they are new ???) Below is a picture of the separator. It is made by a company called Greddy out of California. It is the only air/oil separator that I have found for aftermarket automotive use. I found several others made for piston driven small aircraft. __________________ 72 C10 Burb 350 700R4 70 C20 LWB 350 Crate TH400 68 Chevelle Last edited by rn2fine; 04-25-2004 at 10:04 PM.

04-25-2004, 05:53 PM	#2
Johnny Outdoors SOON TO BE A STEP SIDE Join Date: Apr 2004 Location: Little Valley, N.Y. Posts: 169	ONCE YOU HAVE THAT MOUNTED IS THERE AN EASY WAY TO CLEAN IT OUT? IS THERE A SCREEN INSIDE OR JUST BAFFLES? IF YA DONT MIND WHAT WAS THE COST? __________________ 67 CHEVY LONGBED----- BEST 51 DOLLARS EVER SPENT ON EBAY! 4.3 LITER INJECTED MOTOR WITH 5 SPEED GOING IN SOON

04-25-2004, 06:41 PM	#3
rn2fine Registered User Join Date: Jan 2004 Location: Arizona Posts: 157	The mounting holes are on the back. There are three holes on the side as seen in the picture. One is for a drain plus (it came in the box) and the other two holes hold a clear tube that indicates how much oil has been trapped. Ironically it is hollow inside. When the air makes a sharp turn the oil goes down into the cavity due to it's weight. I first learned about them through some Corvette on-line forums where owners were talking about them quite a bit. I have seen many designs. Some people build their own, some pack them with material. I will see how this design performs and let everyone know. It sells for roughly $85 on various sites throughout the net. I bought directly from Greddy for $99. Below are some sites about separators. The last one is the Greddy site. http://www.y8s.com/celica/air-oil/ http://www.autospeed.com/cms/article.html?&A=0338&P=1 http://www.andair.co.uk/system/index.html http://www.greddy.com/products/produ...0Catch%20Tanks __________________ 72 C10 Burb 350 700R4 70 C20 LWB 350 Crate TH400 68 Chevelle

04-25-2004, 07:22 PM	#4
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	The pcv valve couldn't suck oil past the valves unless the guide & seals were worn. Suspect your separator will end up with the same gook. __________________ Stepsides look like real trucks! Smitty

04-25-2004, 07:28 PM	#5
Johnny Outdoors SOON TO BE A STEP SIDE Join Date: Apr 2004 Location: Little Valley, N.Y. Posts: 169	THANKS FOR THE INFO ILL CHECK OUT THE LINKS __________________ 67 CHEVY LONGBED----- BEST 51 DOLLARS EVER SPENT ON EBAY! 4.3 LITER INJECTED MOTOR WITH 5 SPEED GOING IN SOON

04-25-2004, 10:55 PM	#6
tomsC10R Registered User Join Date: Nov 2003 Location: Wisconsin Posts: 281	What are the dimensions? __________________ Tom 1968 C10 LWB. 402 BB, Holley MPI, 700R4. 4wheel Hydroboost Disk Brakes.

04-26-2004, 12:56 AM	#7
rn2fine Registered User Join Date: Jan 2004 Location: Arizona Posts: 157	7 inches tall 2 1/2 inches wide 3 inches deep __________________ 72 C10 Burb 350 700R4 70 C20 LWB 350 Crate TH400 68 Chevelle

04-26-2004, 01:18 AM	#8
tomsC10R Registered User Join Date: Nov 2003 Location: Wisconsin Posts: 281	Thanks I might just have to get that if the budget allows... Hey, one more question. Are those barb fittings removable? Possibly pipe thread holes? It looks like they are... I'd like to run AN line if I decide to get it. Thanks again, Tom __________________ Tom 1968 C10 LWB. 402 BB, Holley MPI, 700R4. 4wheel Hydroboost Disk Brakes. Last edited by tomsC10R; 04-26-2004 at 01:22 AM.

04-26-2004, 01:30 AM	#9
rn2fine Registered User Join Date: Jan 2004 Location: Arizona Posts: 157	The barb fittings are removable. However, I believe that they are metric. They come with either 9mm or 15mm barbs. I chose the 9mm barb because it is closest to the size 6 braided Russell fuel line that I use for my PCV. Greddy sells these things mostly to people with hopped up imports. Greddy specializes in stuff for Hondas and such. __________________ 72 C10 Burb 350 700R4 70 C20 LWB 350 Crate TH400 68 Chevelle

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