Duramax Diesels Forum Truck of the Week
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Old 01-13-2020, 07:00 AM
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Default Off-Brand Vibrant PCV Scavenge Fittings

Does anyone have any experience with these evac fittings? https://www.amazon.com/gp/product/B0...RJETTLJ1&psc=1

I am looking at installing a Vibrant catch can (4 port, closed system) and running the lines into the exhaust. This post is not a "will it work" thread (we know it does), this is more so a post to determine if these off brand fittings work as well as the vibrant ones or if I need to scour the web/ebay to find genuine vibrant fittings.
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Old 01-13-2020, 08:01 AM
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How much vacuum does the Vibrant fitting or these style pull? I am thinking about in installing 1 or 2 in my new down pipe, but not sure if its any better than my current vented catch can.
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Old 01-13-2020, 08:06 AM
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Quote:
Originally Posted by MAXX IT OUT View Post
How much vacuum does the Vibrant fitting or these style pull? I am thinking about in installing 1 or 2 in my new down pipe, but not sure if its any better than my current vented catch can.
That I don't know, but I do know it is more than atmospheric pressure in regards to it *should* hit negative (vacuum) as opposed to just 0psig. I'm planning on putting 2x of these in my lower downpipe half as well as in a customers LLY I just wrapped up.
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-1340hp/2200ft-lbs @ ATS Diesel (06/04/19)
-Tuned by Zach @ Starlite
-Built Motor, Forced Inductions Billet ETR Gen 4 S480/96/1.10 T6 w/V2 Race Cover, Modded Exergy 250% Injectors, Exergy 14mm Street Pump/LBZ CP3, Goerend Q Converter, Billet Trans, Fuelab Supply Pump/Reg, RCD & Beans Sumps, Front E-Locker, TrueTrac, Yukon 4340 Rear Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support, Banks iDash 1.8 Monitoring System

2) DD/Tow Rig: 2002 LB7 CCSB, Leather, Loaded
-Tuned by Starlite
-Cast S475/96/1.10 T6 Over Stock IHI, FASS 150,4" Exhaust, RCD Sump, PPE Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap, LML Oil Pump, LML Piston Cooling Nozzles, 2020 L5P Oil Cooler, Derale Aux Oil Cooler w/Fan, Banks iDash 1.8 Monitoring System
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Old 01-13-2020, 08:07 AM
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They look identical to the Vibrant one I bought.
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Old 01-13-2020, 08:27 AM
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generally -1 to -2psi is what ive seen/found. higher the exhaust velocity, the more you gain from it. 2 hoses/venturi's seem to work best as well so either one from each valve cover or a large catch can with two breathers in from the valve covers back to 2 breathers out.
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Old 01-13-2020, 08:38 AM
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Quote:
Originally Posted by Chevy1925 View Post
generally -1 to -2psi is what ive seen/found. higher the exhaust velocity, the more you gain from it. 2 hoses/venturi's seem to work best as well so either one from each valve cover or a large catch can with two breathers in from the valve covers back to 2 breathers out.
Thats the plan, just wanted to make sure these fittings are decent. I know vibrant one are what have been used/discussed but are no longer produced.

I figure 2x -10 hoses should be sufficient as that is what is on the catch can (I don't recall what my merchant PCV reroute fitting size is but I'll make it work). Plan is to weld the fittings in the downpipe just after the bend to point rearward as it should have good velocity and still keep heat. Putting them before the bend I am worried about a potential backup/not as high of velocity.
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-1340hp/2200ft-lbs @ ATS Diesel (06/04/19)
-Tuned by Zach @ Starlite
-Built Motor, Forced Inductions Billet ETR Gen 4 S480/96/1.10 T6 w/V2 Race Cover, Modded Exergy 250% Injectors, Exergy 14mm Street Pump/LBZ CP3, Goerend Q Converter, Billet Trans, Fuelab Supply Pump/Reg, RCD & Beans Sumps, Front E-Locker, TrueTrac, Yukon 4340 Rear Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support, Banks iDash 1.8 Monitoring System

2) DD/Tow Rig: 2002 LB7 CCSB, Leather, Loaded
-Tuned by Starlite
-Cast S475/96/1.10 T6 Over Stock IHI, FASS 150,4" Exhaust, RCD Sump, PPE Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap, LML Oil Pump, LML Piston Cooling Nozzles, 2020 L5P Oil Cooler, Derale Aux Oil Cooler w/Fan, Banks iDash 1.8 Monitoring System
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Old 01-13-2020, 12:27 PM
gmc502 gmc502 is offline
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think you could weld these in to the up pipe and let the hotter exhaust gas burn up the oil fumes?
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Old 01-13-2020, 12:35 PM
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I know other have had luck with these, however, I did not. Had a 1/2" in the original downpipe and it actually created positive pressure and back fed exhaust soot to the valve covers. Rocker area looked like oil/soot mixture when we pulled the heads.

Maybe 2 1/2" fittings will work. We just run our to atmosphere now and everything was spotless when we pulled heads this time.

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Old 01-13-2020, 12:47 PM
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Quote:
Originally Posted by gmc502 View Post
think you could weld these in to the up pipe and let the hotter exhaust gas burn up the oil fumes?
not unless you want to pressurize the crank case. Up pipes are under positive pressure the moment you start to come on boost (actually before boost comes on but close enough).
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2002 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/6sp alli "The Limo"

2020 L5P 2500HD CC/LB dmax/10sp alli "The New Limo" staying stock........ish

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Old 01-13-2020, 12:49 PM
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Quote:
Originally Posted by coker6365 View Post
I know other have had luck with these, however, I did not. Had a 1/2" in the original downpipe and it actually created positive pressure and back fed exhaust soot to the valve covers. Rocker area looked like oil/soot mixture when we pulled the heads.

Maybe 2 1/2" fittings will work. We just run our to atmosphere now and everything was spotless when we pulled heads this time.

Sent from my SM-G965U1 using Tapatalk
you had the venturi put in at the same angle as the slit at the end of the nozzle? was it facing correctly inside? if its not put in right, it will add pressure to the system and if there is any back pressure in the exhaust, it will do the same.
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Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

2002 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/6sp alli "The Limo"

2020 L5P 2500HD CC/LB dmax/10sp alli "The New Limo" staying stock........ish

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Old 01-13-2020, 12:56 PM
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Quote:
Originally Posted by Chevy1925 View Post
you had the venturi put in at the same angle as the slit at the end of the nozzle? was it facing correctly inside? if its not put in right, it will add pressure to the system and if there is any back pressure in the exhaust, it will do the same.
I will have to look, that downpipe is on the shelf. And it may have been some sort of off brand contraption since it was already in the downpipe when we pieced together the kit. My situation has a lot of variables I am sure. We just simply went to atmo with it and done.

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Old 01-13-2020, 01:18 PM
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Quote:
Originally Posted by Chevy1925 View Post
you had the venturi put in at the same angle as the slit at the end of the nozzle? was it facing correctly inside? if its not put in right, it will add pressure to the system and if there is any back pressure in the exhaust, it will do the same.
I don't think I'll have back-pressure issues with the 4" and including how short it is before the stack.

Quote:
Originally Posted by coker6365 View Post
I know other have had luck with these, however, I did not. Had a 1/2" in the original downpipe and it actually created positive pressure and back fed exhaust soot to the valve covers. Rocker area looked like oil/soot mixture when we pulled the heads.

Maybe 2 1/2" fittings will work. We just run our to atmosphere now and everything was spotless when we pulled heads this time.

Sent from my SM-G965U1 using Tapatalk
My only concern with this is potentially getting flagged at the local track. Friend of mine's Cummins got flagged and told he had to have a catch can (it wasn't puking oil either).
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Current Rides:
1) Toy: 2005 LLY ECSB, Leather, Sunroof
-1340hp/2200ft-lbs @ ATS Diesel (06/04/19)
-Tuned by Zach @ Starlite
-Built Motor, Forced Inductions Billet ETR Gen 4 S480/96/1.10 T6 w/V2 Race Cover, Modded Exergy 250% Injectors, Exergy 14mm Street Pump/LBZ CP3, Goerend Q Converter, Billet Trans, Fuelab Supply Pump/Reg, RCD & Beans Sumps, Front E-Locker, TrueTrac, Yukon 4340 Rear Shafts, Traction Bars, DHD Center Link Brace, DHD Lower Crossmember Support, Banks iDash 1.8 Monitoring System

2) DD/Tow Rig: 2002 LB7 CCSB, Leather, Loaded
-Tuned by Starlite
-Cast S475/96/1.10 T6 Over Stock IHI, FASS 150,4" Exhaust, RCD Sump, PPE Sleeves, DHD Centerlink Brace, DHD Lower Crossmember Support, Steering Wheel Radio Control Swap, LML Oil Pump, LML Piston Cooling Nozzles, 2020 L5P Oil Cooler, Derale Aux Oil Cooler w/Fan, Banks iDash 1.8 Monitoring System
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Old 01-13-2020, 06:39 PM
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Quote:
Originally Posted by Chevy1925 View Post
not unless you want to pressurize the crank case. Up pipes are under positive pressure the moment you start to come on boost (actually before boost comes on but close enough).
thanks for reminding me about drive pressure,,brain farted on that one.
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Old 01-14-2020, 07:29 AM
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Quote:
Originally Posted by Chevy1925 View Post
generally -1 to -2psi is what ive seen/found. higher the exhaust velocity, the more you gain from it. 2 hoses/venturi's seem to work best as well so either one from each valve cover or a large catch can with two breathers in from the valve covers back to 2 breathers out.
Exactly, and yeah diesel exhaust is slow, so they do work but not very well. They’ll pull nice vacuum on a NA gas engine.
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Old 01-14-2020, 07:36 AM
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Quote:
Originally Posted by coker6365 View Post
I know other have had luck with these, however, I did not. Had a 1/2" in the original downpipe and it actually created positive pressure and back fed exhaust soot to the valve covers. Rocker area looked like oil/soot mixture when we pulled the heads.

Maybe 2 1/2" fittings will work. We just run our to atmosphere now and everything was spotless when we pulled heads this time.

Sent from my SM-G965U1 using Tapatalk
I did too. The problem is diesel exhaust is too slow. I had much better results just venting to atmosphere. We all know the physics behind the design, but sometimes the practicality of them come into question. I too just vent to the atmosphere now. Simpler and works every time. Jmo
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