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My catch can routing ok?

Old 04-07-2018, 05:06 PM
  #701  
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Originally Posted by 99Silver6.0 View Post
Yes, correct. I just merely wanted to see if how I plumbed this and if the orificed PCV valve was most ideal/efficient. Iíve been out of the LS game for a while. Last catch can I installed was on my old 99 Silverado.



Didnít really say anything. I went off routing on my old truck.
Well stock configuration on my car was a hose from the driver side valve cover that tied into the rear facing port on the passenger valve cover and then the hose ran along the top of the passenger cylinder head and connected to the port on the intake manifold behind the throttle body.

This is what is called as the dirty side of the PCV system. The fresh side was a hose from the front facing port on the passenger valve cover to the port on the throttle body and if no port was there then into the air lid or bellow between the MAF and the TB. If installing a sealed catch can just connect it up as mentioned above but instead of the hose going into the intake manifold run it to the inlet side of the catch can and then the outlet side to the intake manifold.
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Old 04-26-2018, 04:19 AM
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I need to clarify this as this is not only my first LS type engine but I got it without any hoses etc and having read all the posts I'm still unsure of the best way for my install.

I have the later LS6 valley cover with built in PCV
And LS6 intake
5.3 Truck valve covers (which have on 1 hose connection on each)
5.3 TB.
Engine is 5.3 NA.

I also have a twin catch can.

So do I do as follows:

Clean side
Connect Intake connection to inlet on Clean side air catch can then outlet to both Valve covers (to supply fresh air into valve covers and hence crankcase)

Dirty side
Connect Valley cover outlet to inlet on Dirty side catch can then outlet to TB connection

Does this sound right?

Like this...?


Last edited by TableLeg; 04-26-2018 at 04:41 AM. Reason: Image added.
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Old 04-27-2018, 11:53 AM
  #703  
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That looks fine to me, but if I were doing it myself, I would simplify it a bit by capping the DS valve cover port and just using the PS inlet. The only restriction in the system is the orifice hole in the valley port, so having two inlets isn't really benefiting.
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Old 04-28-2018, 03:44 AM
  #704  
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Originally Posted by BudRacing View Post
That looks fine to me, but if I were doing it myself, I would simplify it a bit by capping the DS valve cover port and just using the PS inlet. The only restriction in the system is the orifice hole in the valley port, so having two inlets isn't really benefiting.
Many thanks for the reply. I'll do as you suggest.

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Old 07-31-2018, 11:01 PM
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Originally Posted by 405HP_Z06 View Post
blk00ss,

Here is how I recommend connecting your PCV system based on the information provided. Keep in mind that a catch can will not fix mechanical issues. If the engine is too loose, burning oil, etc, a catch can will do nothing to help these conditions.

[IMG]http://www.andersonperformance.net/LS2 Single PCV NA.jpg

9 years later. I just found this thread. I have my catch can set up exactly like this. The only difference is my check valve is the opposite direction.

I thought suction comes from the TB. pulling through both valve covers. dirty goes in from the valley cover port. Ill upload a pic and thats probably why my can doesnt get much action. The intake stays decent from oil residue but Ill swap it around when I get back to the car next week.

Last edited by ssdungeon; 07-31-2018 at 11:19 PM.
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Old 08-01-2018, 10:07 AM
  #706  
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There is no use for a check valve on a naturally-aspirated setup however all PCV systems require a PCV valve or orifice to regulate intake manifold application to the crankcase.
*further- it is extremely dangerous to follow some online-found schematic vs. the one provided by the manufacturer. accidental error on the engine ventilation strategy can shorten engine life or cause immediate damage.
-if your catch can did not come with info on how to hook it up, it is probably not the best investment.

Last edited by MIGHTYMOUSE; 08-01-2018 at 10:32 AM.
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Old 08-06-2018, 06:45 PM
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Originally Posted by MIGHTYMOUSE View Post
There is no use for a check valve on a naturally-aspirated setup however all PCV systems require a PCV valve or orifice to regulate intake manifold application to the crankcase.
*further- it is extremely dangerous to follow some online-found schematic vs. the one provided by the manufacturer. accidental error on the engine ventilation strategy can shorten engine life or cause immediate damage.
-if your catch can did not come with info on how to hook it up, it is probably not the best investment.
Thanks MM for the response. Followed your car for a long time the old car you had.

The thing is there are so many LS setups out here that most cans don't have a diagram for each variation. For instance with or without the LS6 valley cover. Some valve covers have dual ports on the passenger side as pictured and some don't. No one supplies diagrams for all of the possibilities. So we come here . My can is one I made with baffles and all, a check valve is also under the breather to keep unmetered air from coming in but will allow air out if its enough pressure. I have another one on the bench now smaller in size and built a lot better. I like it when I do it myself.

One last question though if I removed the check valve all together. Would that make this routing righteous?


I REALLY appreciate the feedback.
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Old 08-07-2018, 09:38 AM
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i know it seems reasonable, but because i deal with the repercussions of it every day, i am here to say again that 'sharing' ventilation strategies across all of the catch can variants around is dangerous at the least. if the hook up is not obviously detailed to a perspective buyer then i would ask the manufacture for help, and make sure i understood clearly the install before beginning or even purchasing.. i help people through this every day. i also help people that purchase first and and questions later; from questions clearly answered in the provided instructions to new very good questions, and oddball setups getting more popular with mix-matched parts. if you are not finding the answers to the questions, you can roll the dice, figure it out the hard way, or keep searching for another maker.

since i did not build your can i have no way to tell you what it can or cant do vs. what you want it to do, or how it should or shouldn't be hooked up besides an educated guess.

if you like to do it yourself then you are forfeiting the customer support that comes along with a product like mine where this is guaranteed to be figured out for you along with superior performance.

TBH i dont go through 200 of these a month because they are easy enough for everyone to figure out what they need, or figure how to make it, or how to hook it up, to get the job they need done to enjoy their hobby.

if you want to send me some pics of the car and your can to [email protected] i will tell you what i think it will do and won't do, and you can decide if that is good enough for you. not going to say what magic sauce is in mine etc. because that info has cost me years and years of development and plenty of dollar bills. I hope you understand.

Originally Posted by ssdungeon View Post
Thanks MM for the response. Followed your car for a long time the old car you had.

The thing is there are so many LS setups out here that most cans don't have a diagram for each variation. For instance with or without the LS6 valley cover. Some valve covers have dual ports on the passenger side as pictured and some don't. No one supplies diagrams for all of the possibilities. So we come here . My can is one I made with baffles and all, a check valve is also under the breather to keep unmetered air from coming in but will allow air out if its enough pressure. I have another one on the bench now smaller in size and built a lot better. I like it when I do it myself.

One last question though if I removed the check valve all together. Would that make this routing righteous?


I REALLY appreciate the feedback.
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Old 08-14-2018, 08:22 AM
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Originally Posted by TableLeg View Post
I need to clarify this as this is not only my first LS type engine but I got it without any hoses etc and having read all the posts I'm still unsure of the best way for my install.

I have the later LS6 valley cover with built in PCV
And LS6 intake
5.3 Truck valve covers (which have on 1 hose connection on each)
5.3 TB.
Engine is 5.3 NA.

I also have a twin catch can.

So do I do as follows:

Clean side
Connect Intake connection to inlet on Clean side air catch can then outlet to both Valve covers (to supply fresh air into valve covers and hence crankcase)

Dirty side
Connect Valley cover outlet to inlet on Dirty side catch can then outlet to TB connection

Does this sound right?

Like this...?

I need to clarify one more thing in relation to this proposed catch can hook up.
I do not have the connection at the throttle body as shown in this diagram in Green (supply to clean air side catch can).
Can I connect it to a pipe connection on the air intake pipe (before the throttle body)?
Like this?

Doesn't this leave unmetered air in the circuit?

Last edited by TableLeg; 08-14-2018 at 08:35 AM.
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Old 08-14-2018, 11:34 AM
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anywhere after the maf in front of the throttle blade
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Old 08-14-2018, 11:42 AM
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Originally Posted by MIGHTYMOUSE View Post
anywhere after the maf in front of the throttle blade
Thanks MightyMouse,

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