One way valve at collector for evacuation system

Jeff Stout · 03-23-2018, 03:17 PM

Looking for part number for the valve that screws onto collector and house from valve cover slips on. NAPA says $50.00 each and I walked out. Thanks in advance for part number or year and make of vehicle.

Starship · 03-23-2018, 03:34 PM

Standard Motor Products AV7

Jeff Stout · 03-23-2018, 03:50 PM

Quote:

Originally Posted by Starship

Standard Motor Products AV7

Thanks I wanted them today or I would order from speed shop. Now if auto parts store has them I'm golden thank you again

1720 · 03-23-2018, 03:51 PM

Moroso Replacement Check Valves 97800?

https://www.summitracing.com/int/par...illocation=int

FED 387 · 03-23-2018, 06:07 PM

u need a Dorman 355050 --- its called a secondary air injection check valve about $12-15 - most auto parts stores--go to a late model junk yard look for most any 92-2007 or so GM car they go and are part of the plumbing for the pollution stuff should be by the exhaust manifold-- remember that GM used the type the had Hose barbs on both ends an the type that had a hose barb on one end and a female threaded port on the other end ---FED 387

TERMITE S/G 2122 · 03-23-2018, 06:42 PM

Autozone cv8 By BWD

CMcAllister · 03-23-2018, 06:55 PM

NAPA is a Echlin CRB 229000 $16-18.

FED 387 · 03-23-2018, 06:58 PM

Actually if u find the right parts store $6-8

MAURICE BLENDHEIM · 03-24-2018, 09:14 AM

What we have found with these common check valves is, they require more vacuum and more crankcase pressure to move internal valve off the seat. In their original form they are designed to stop exhaust back pressure from entering air injection system. An air injection system develops a higher pressure than what your crankcase pressure "should not be". The header vacuum signal also is in most cases is not high enough to move valve off the seat either and back pressure in an open header application has as close to zero back pressure as you can get. These check valves actually work when you hollow them out with a drill. Your crankcase pressure is then evacuated through those relatively restricted breathers in the rocker covers, through the 3+ foot long 5/8" hose connected to the check valves that are mounted to the 1/2" NPT nipples that are 3-4" long that has one end cut on a 45 degree angle with an orifice cut into it, scientifically positioned into the collector that develops a very "low to no" vacuum signal, to create an evacuation atmosphere or a complex "road draft" system. Check it out and see what I mean. I stand to be corrected. Maurice.

MR DERBY CITY · 03-24-2018, 09:23 AM

Quote:

Originally Posted by Jeff Stout

Looking for part number for the valve that screws onto collector and house from valve cover slips on. NAPA says $50.00 each and I walked out. Thanks in advance for part number or year and make of vehicle.

Jeff, I know you have multiple race cars ...you do realize you can not run a vac u pan system in stock eliminator .?

03-23-2018, 03:17 PM	#1
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,406 Likes: 53 Liked 654 Times in 254 Posts	One way valve at collector for evacuation system Looking for part number for the valve that screws onto collector and house from valve cover slips on. NAPA says $50.00 each and I walked out. Thanks in advance for part number or year and make of vehicle.

03-23-2018, 03:34 PM	#2
Starship Junior Member Join Date: Feb 2008 Posts: 14 Likes: 1 Liked 12 Times in 1 Post	Re: One way valve at collector for evacuation system Standard Motor Products AV7

03-23-2018, 03:51 PM	#4
1720 Junior Member Join Date: Feb 2011 Location: Ontario, Canada Posts: 30 Likes: 164 Liked 2 Times in 1 Post	Re: One way valve at collector for evacuation system Moroso Replacement Check Valves 97800? https://www.summitracing.com/int/par...illocation=int __________________ RT - SS/X circa 1972. Talbot Racing Family

03-23-2018, 06:07 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,349 Likes: 320 Liked 280 Times in 150 Posts	Re: One way valve at collector for evacuation system u need a Dorman 355050 --- its called a secondary air injection check valve about $12-15 - most auto parts stores--go to a late model junk yard look for most any 92-2007 or so GM car they go and are part of the plumbing for the pollution stuff should be by the exhaust manifold-- remember that GM used the type the had Hose barbs on both ends an the type that had a hose barb on one end and a female threaded port on the other end ---FED 387

03-23-2018, 06:42 PM	#6
TERMITE S/G 2122 Junior Member Join Date: Apr 2009 Location: n.c. Posts: 86 Likes: 0 Liked 9 Times in 6 Posts	Re: One way valve at collector for evacuation system Autozone cv8 By BWD

03-23-2018, 06:55 PM	#7
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 529 Likes: 9 Liked 734 Times in 204 Posts	Re: One way valve at collector for evacuation system NAPA is a Echlin CRB 229000 $16-18.

03-23-2018, 06:58 PM	#8
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,349 Likes: 320 Liked 280 Times in 150 Posts	Re: One way valve at collector for evacuation system Actually if u find the right parts store $6-8 Last edited by FED 387; 03-23-2018 at 06:58 PM. Reason: Spelling

03-24-2018, 09:14 AM	#9
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 550 Likes: 269 Liked 226 Times in 77 Posts	Re: One way valve at collector for evacuation system What we have found with these common check valves is, they require more vacuum and more crankcase pressure to move internal valve off the seat. In their original form they are designed to stop exhaust back pressure from entering air injection system. An air injection system develops a higher pressure than what your crankcase pressure "should not be". The header vacuum signal also is in most cases is not high enough to move valve off the seat either and back pressure in an open header application has as close to zero back pressure as you can get. These check valves actually work when you hollow them out with a drill. Your crankcase pressure is then evacuated through those relatively restricted breathers in the rocker covers, through the 3+ foot long 5/8" hose connected to the check valves that are mounted to the 1/2" NPT nipples that are 3-4" long that has one end cut on a 45 degree angle with an orifice cut into it, scientifically positioned into the collector that develops a very "low to no" vacuum signal, to create an evacuation atmosphere or a complex "road draft" system. Check it out and see what I mean. I stand to be corrected. Maurice.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode