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My catch can routing ok?

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Old 03-05-2017, 08:14 PM   #641
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no. you cannot merge or delete part of the pcv system and have it still be ok.

pcv system must always be clean air in one end of the engine (measured by the MAF if you have one) dirty air out to pcv valve, line from pcv valve to intake manifold. catch can could be before or after the pcv valve but there can only be one hose between valve and intake manifold
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Old 04-09-2017, 05:42 PM   #642
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After reading through this thread and several others, it seems like there are more than one ways to route everything.

For a twin turbo set up, trying to make around 600-700rwhp, would this be an idea routing method using a standard/cheap catch can? Only difference is I would most likely try to Y the two rear ports together.

What issues could I have doing it this way or is it good?

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Old 04-10-2017, 08:57 AM   #643
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that flows the same as the stock pcv system because

it is a closed can

it uses a stock size fresh air / vent to the turbo

it will catch dirty side pcv flow

it will not catch clean side pcv flow

in order to flow more than the stock system we need lines larger than the stock system or multiple pressure exit points
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Old 04-10-2017, 11:27 AM   #644
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Quote:
Originally Posted by MIGHTYMOUSE View Post
that flows the same as the stock pcv system because

it is a closed can

it uses a stock size fresh air / vent to the turbo

it will catch dirty side pcv flow

it will not catch clean side pcv flow

in order to flow more than the stock system we need lines larger than the stock system or multiple pressure exit points
As far as it being a closed can, is that relating to air entering into the can or exiting out of it? I wanted a closed system in my mind because I didn't want to have to smell any oil vapors while driving.

I wasn't sure if a clean side catch was necessary? Does your single can set up do both clean/dirty sides or one only?
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Old 04-10-2017, 01:15 PM   #645
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what i mean by closed can is that there is no alternate ventilation point other than the stock one

clean side catch cans are for when the first catch can you install does not do the whole job.

yes i like to see only one (good) can to cover all the bases
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Old 04-10-2017, 01:22 PM   #646
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Quote:
Originally Posted by MIGHTYMOUSE View Post
what i mean by closed can is that there is no alternate ventilation point other than the stock one

clean side catch cans are for when the first catch can you install does not do the whole job.

yes i like to see only one (good) can to cover all the bases
I am assuming your can with the filter on top solves that closed can issue, by allowing it another ventilation point to take in air from? Is that only for air to enter into the can and not exit it? Cause when I was looking at your cans, I actually wasn't sure if the filter was meant to allow air in, out, or both?
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Old 04-10-2017, 01:54 PM   #647
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depends on the model, draft and pcv are pressure release only
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Old 04-10-2017, 04:18 PM   #648
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Quote:
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depends on the model, draft and pcv are pressure release only
From what I read on your site, the PCV seems like the set up to go with if I wanted to minimize oil smells. However, with the filter on top, at what pressure/psi does it open to vent out at?
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Old 04-10-2017, 05:55 PM   #649
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it depends on if you are past what the stock pcv system can handle or how you want it to look as to if you need to go all the way to the pcv can. the pcv is the most flexible model for sure.

the breather or recirculator top open at 0psi see this.

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Old 05-16-2017, 10:11 AM   #650
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Default still having trouble with high crankcase pressure, my catch can system isn't enough.

I have an '01 LS1 block (non vented journals) that's built into a 383 stroker. professionally built engine, 4" crank, ported 243 heads, matched cam, etc. 553 flywheel hp. I have an RX catch can routed like the pic attached from this thread yet I'm still getting excessive crankcase pressure and it likes to blow out past the o-ring at the base of my dispstick tube.

1- I don't want to just add breathers as if I understand this correctly- it'll defeat the whole catch can assy and be an issue for track days.

2- currently the tubing is 3/8" size. I could make tubes bigger but it will still bottleneck at the throttle body and on my valley pan (I have installed an LS6 style valley pan) Would that even help?

3- I am considering adding a pressure relief valve in the system, perhaps between the valley pan and catch can itself. maybe a 5psi valve with a breather type filter at the end. Would this work?

The engine itself is good, runs strong with only 6k miles and doesn't otherwise burn or leak oil except from the excessive pressure blow outs. I've had 3 incidents now. 2 at track days, and once this weekend when I wasn't even getting on the engine- maybe 30% throttle around a right turn. I did see the oil pressure gauge go up past 80 (engine has the melling 10296 pump and I use castrol 20/50 VR1 racing oil per the engine builder) and then it blew out again.


Obviously I'm missing something or doing something wrong. Thoughts or suggestions? Thanks!



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Old 05-16-2017, 10:20 AM   #651
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the issue is that you are using a 300hp pcv system on a 550hp engine. you would not use stock injectors, or stock tires.. time to move away from that stock pcv system.

for example this vid

Quote:
Originally Posted by tuske427 View Post
I have an '01 LS1 block (non vented journals) that's built into a 383 stroker. professionally built engine, 4" crank, ported 243 heads, matched cam, etc. 553 flywheel hp. I have an RX catch can routed like the pic attached from this thread yet I'm still getting excessive crankcase pressure and it likes to blow out past the o-ring at the base of my dispstick tube.

1- I don't want to just add breathers as if I understand this correctly- it'll defeat the whole catch can assy and be an issue for track days.

2- currently the tubing is 3/8" size. I could make tubes bigger but it will still bottleneck at the throttle body and on my valley pan (I have installed an LS6 style valley pan) Would that even help?

3- I am considering adding a pressure relief valve in the system, perhaps between the valley pan and catch can itself. maybe a 5psi valve with a breather type filter at the end. Would this work?

The engine itself is good, runs strong with only 6k miles and doesn't otherwise burn or leak oil except from the excessive pressure blow outs. I've had 3 incidents now. 2 at track days, and once this weekend when I wasn't even getting on the engine- maybe 30% throttle around a right turn. I did see the oil pressure gauge go up past 80 (engine has the melling 10296 pump and I use castrol 20/50 VR1 racing oil per the engine builder) and then it blew out again.


Obviously I'm missing something or doing something wrong. Thoughts or suggestions? Thanks!



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Old 05-16-2017, 10:59 PM   #652
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Quote:
Originally Posted by MIGHTYMOUSE View Post
the issue is that you are using a 300hp pcv system on a 550hp engine. you would not use stock injectors, or stock tires.. time to move away from that stock pcv system.

for example this vid
https://www.youtube.com/watch?v=Jl70sRRpibk

The logic makes sense.

How does your kit work? I was looking on your website- that breather on top of the can for the 4th LS F body wild, is it an open breather? Or is it a one way exit only (pressure release valve)?
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Old 05-16-2017, 11:08 PM   #653
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Quote:
Originally Posted by tuske427 View Post
The logic makes sense.

How does your kit work? I was looking on your website- that breather on top of the can for the 4th LS F body wild, is it an open breather? Or is it a one way exit only (pressure release valve)?
It's a 1 way breather. His can also has a built in PCV. I tried fabing up my own and in the end, I scrapped it and went with his setup. It's very nice and hands down the best catch can on the market.

No smell and does everything I want it to do.
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Old 05-17-2017, 09:17 PM   #654
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Quote:
Originally Posted by 5.7stroker View Post
It's a 1 way breather. His can also has a built in PCV. I tried fabing up my own and in the end, I scrapped it and went with his setup. It's very nice and hands down the best catch can on the market.

No smell and does everything I want it to do.
Good to know, thanks!
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