V1 LSJ atmosphere Catch Can

[David]

Hello everyone, I know its been discussed a couple times but I read as far back as possible using the soso search bar. I picked a couple guys brains on here and also know shops to try and gather as much information as possible. Wanted to post it here incase I missed something or other ideas arise.

Im in the process of switching out my LSJ intake manifold for a Dyemond manifold which eliminates the PCV easily. I want to eliminate the PCV to avoid as much oil as possible.

Majority of shops and guys I spoke to said the following.

- Plug the PCV port on the Dyemond manifold

- Drill out the valve cover vent port because it has a restrictor inside. Or add a -10 or -12 AN fittings to the valve cover.

- Plug the Turbo vacuum line that used to go to the valve cover

- Run the new AN hose or Ported nipple to the Atmosphere catch can which would be one port. Was looking at the motive can.

Motion Raceworks Top Loader Billet Internally Baffled Oil Catch Can (

Motion Raceworks Top Loader Billet Catch Can ( Single 12 AN Port ) 32-101BLK (NOTE: DOES NOT INCLUDE ring to AN fittings unless added in options.) This catch can is the results of years of building, refining, and optimizing N/A and Boosted combos. Featuring a dual internal baffling design, this...

motionraceworks.com

Let me know what you guys think

 

[jirwin]

I'm running open atmosphere after having a lot of issues with turbo and PCV last summer. I'm not saying its ideal, I'm just saying I got it to work and I haven't touched it. To add more "flow" on mine I also added in a line to a baffled oil cap because I didn't want to weld on an additional bung: https://www.radiumauto.com/products/baffled-gm-oil-cap. Probably wasn't necessary in hindsight, but oh well.

 

[David]

I'm running open atmosphere after having a lot of issues with turbo and PCV last summer. I'm not saying its ideal, I'm just saying I got it to work and I haven't touched it. To add more "flow" on mine I also added in a line to a baffled oil cap because I didn't want to weld on an additional bung: https://www.radiumauto.com/products/baffled-gm-oil-cap. Probably wasn't necessary in hindsight, but oh well.

I read a couple of your post with the issues you where having. If i remember correctly you have a 2.2 so wasn't sure if it was different. Did your valve cover port have the restriction also?

 

[jirwin]

I'm a 2.2 LAP with an entirely different valve cover than you, so different design. I have no restrictor that I know of

 

[Robinjo]

"Catch Can"..... (I know it's not)

 

[Rauq]

I'll add that one thing you're going to lose with that setup is pulling air through the motor. With a properly working PCV setup on an LSJ, when the manifold is in vacuum, air is being pulled into the motor from the barb on the valve cover, through the motor, and then into the intake manifold where it's combusted. When there's boost in the manifold, the PCV valve closes, and crankcase pressure leaves through the valve cover port (with the assistance of plumbing to the intake tract, if set up- a filter on the breather obviously doesn't pull from the valve cover).

I don't know what the consequences are. Maybe a little more sludginess at the top of the head?

Also... I still don't know that you ever confirmed that you have a blowby/crankcase vapor issue, compared to a turbo shaft seal issue or just completely normal oil vapor buildup. Just don't want to see you spinning your wheels if there's not actually something going on preventing you from otherwise enjoying your Goblin.

 

[David]

I'll add that one thing you're going to lose with that setup is pulling air through the motor. With a properly working PCV setup on an LSJ, when the manifold is in vacuum, air is being pulled into the motor from the barb on the valve cover, through the motor, and then into the intake manifold where it's combusted. When there's boost in the manifold, the PCV valve closes, and crankcase pressure leaves through the valve cover port (with the assistance of plumbing to the intake tract, if set up- a filter on the breather obviously doesn't pull from the valve cover).

I don't know what the consequences are. Maybe a little more sludginess at the top of the head?

Also... I still don't know that you ever confirmed that you have a blowby/crankcase vapor issue, compared to a turbo shaft seal issue or just completely normal oil vapor buildup. Just don't want to see you spinning your wheels if there's not actually something going on preventing you from otherwise enjoying your Goblin.

I haven't figured anything out but a bad PCV. The reason why I am asking about the catch can is that the Dyemond intake manifold deletes the PCV system. I read somewhere not sure where, if gone through so many forums and articles. I believe Powell was going back and forth regarding vacuum. All the shops i spoke to nobody mentioned what you bought up. Which is very interesting. I asked Gemini regarding the whole PCV system operations and the final conclusion was.

" If it's a Daily Driver: You might prefer a Sealed Catch Can (Option A from earlier). This gives you the vacuum "scrubbing" for engine health but uses the can to trap the oil before it hits your turbo/intake.

If it's a Weekend Toy/Track Car: Go VTA. The peace of mind knowing you aren't spraying oil into your intercooler or risking a boost-pressurized crankcase usually outweighs the slightly faster oil contamination."

 

[Rauq]

Majority of shops and guys I spoke to said the following.

- Plug the PCV port on the Dyemond manifold

I haven't figured anything out but a bad PCV. The reason why I am asking about the catch can is that the Dyemond intake manifold deletes the PCV system.

The Dyemand intake manifold says it has "⅜ NPT fitting for PCV on the head flange" so you could easily put a catch can between the PCV valve and a vacuum source. Your decision then would be whether to put a breather filter on the valve cover barb, or pipe it to the intake tube post-MAF, either directly or through another catch can or through the same one with additional check valves. Theoretically the breather filter option is pulling un-metered air in at low throttle so is not ideal for that reason, but I and other folks have run that setup before without significant drawback.

 

[David]

The Dyemand intake manifold says it has "⅜ NPT fitting for PCV on the head flange" so you could easily put a catch can between the PCV valve and a vacuum source. Your decision then would be whether to put a breather filter on the valve cover barb, or pipe it to the intake tube post-MAF, either directly or through another catch can or through the same one with additional check valves. Theoretically the breather filter option is pulling un-metered air in at low throttle so is not ideal for that reason, but I and other folks have run that setup before without significant drawback.
View attachment 55258

He mentioned that but wasn't sure how would the stock PCV would fit in the manifold. My existing setup had the valve cover barb was connected to the turbo.

 

[David]

So I still haven't grasp the PCV system. Im assuming the best option would be to add a catch can with 3 ports. 1 inlet and two exits and use check valves. Have to see how would the PCV work with the Dyemond manifold. As the PCV attaches to the oem manifold with oring.

 

[WA08TC]

I spoke with Dyemond about a manifold for the LNF head I'm using on the gen 3 block. Going to be using the same setup as the old motor with some AN fittings if you want some long winded info or pics PM me. I put in my order for it last week he said 3-4 weeks lead time.

 

[BSinvestments]

I have a 8an line from the valve cover port and an oil cap with a 8an line run to a VTA catch can. the factory pct can not hold high pressure and can leak under high boost Ive been told. I have heard from several people that they just plug that factory pct port on stock manifolds and aftermarket.

 

[David]

I have a 8an line from the valve cover port and an oil cap with a 8an line run to a VTA catch can. the factory pct can not hold high pressure and can leak under high boost Ive been told. I have heard from several people that they just plug that factory pct port on stock manifolds and aftermarket.

Yes that is what I have read and been told. But @Rauq brought up a real good point about the air being pulled in.

 

[David]

Ran into this external adjustable PCV valve. Looks like something that could work with the Dyemond intake manifold.

Dual Flow® Adjustable PCV Valve – M/E Wagner Performance Products

 

[David]

I draw up a little diagram with the help of @WA08TC explaining how he run the PCV on the LSJ. Figured I post it up here incase it could help someone.