PCV/Catch Can/Crank Pressure

**GOR1LA** · 02-08-2011, 07:54 PM

yup the valve is along the passenger side. I'm not a home for 2 months so I can't get any pictures or anything. Lets say for right now i'm going to keep the original valley.

**Sarge** · 02-09-2011, 04:22 PM

Ask up in the FBody section.

**tatertot91** · 02-09-2011, 05:07 PM

Originally Posted by GOR1LA

yup the valve is along the passenger side. I'm not a home for 2 months so I can't get any pictures or anything. Lets say for right now i'm going to keep the original valley.

If you're keeping the stock valley run the hose along side the engine into a catch can, on the other end of the catch. Can run it to your intake manifold with a pcv valve in between. Cap off the drivers side valve cover and run a breather. That is how I was going to do it on my 98.

**jjc239** · 03-13-2011, 08:52 PM

what would happen if you ran your pvc to the catch can but didnt put a return line back into the intake and just capped it off at the intake?

**Sarge** · 03-14-2011, 05:47 AM

Where are you proposing you vent the pressure to?

**jjc239** · 03-14-2011, 11:47 AM

Originally Posted by Sarge

Where are you proposing you vent the pressure to?

lol cmon we all know where...just vent that shit outside... not that i did, cousin has a 20det and he didnt return it to the intake, just wondering if that would have any effects on the motor?

**Sarge** · 03-14-2011, 01:25 PM

You gain nothing doing it that way. I vent to the atmosphere from both valve covers so I am not asking you from a tree hugger percpective...... route the valley tray through the CC to the TB...

**darrenct** · 03-16-2011, 10:17 AM

hey sarge... what if you just route an in line type filter or pcv valve instead of using a catch can to the TB? (i have an ls2 GTO)... is there any issues with this setup?

thnx

**tatertot91** · 03-16-2011, 03:42 PM

^that's a little confusing
The tb only provides air to the system, you're much better off with a catch can. An inline filter wouldn't do nearly as good a job

**darrenct** · 03-17-2011, 08:21 AM

ok, thnx for the info!

**JAX04** · 03-17-2011, 03:57 PM

Sarge, how do you feel about exhaust scavenging?? Im going to give it a go on my new setup, it makes sense that would it would only pull more vacuum as exhaust speed increases.

Im going to atleast try it, but would you recomend using a catch can between the valve covers and the exhaust??

also, would you recomend pulling from the valve cover as well with this type setup.

the kit i ordered from moroso came with two nipples and two check valves. so i was thinking tying the two valve covers to one nipple and the valley to its own. it would always be under vacuum even under boost. do you feel like this is a good option??

**Sarge** · 03-17-2011, 04:13 PM

I did that back in the day

No catch can required.
You got it right. It will pull like a bitch...you will rev faster.

**JAX04** · 03-18-2011, 04:48 AM

Originally Posted by Sarge

I did that back in the day

No catch can required.
You got it right. It will pull like a bitch...you will rev faster.

Very cool sarge, Im not sure why more people dont do it, it seems like an amazing thing.

we shall see

**jjc239** · 03-18-2011, 05:14 PM

Originally Posted by JAX04

Very cool sarge, Im not sure why more people dont do it, it seems like an amazing thing.

we shall see

hey can you post a link to that kit pls?

**JAX04** · 03-18-2011, 05:56 PM

no problem, Hope its allowed on this site, its from summit.

http://www.summitracing.com/parts/MOR-25900/

**GOR1LA** · 03-18-2011, 06:30 PM

So how does that get installed?

**jjc239** · 03-19-2011, 08:10 AM

Originally Posted by GOR1LA

So how does that get installed?

do you have a ls1? because we only have one side we can put a beather on

**GOR1LA** · 03-19-2011, 09:01 AM

yup ls1 for me!

**JAX04** · 03-19-2011, 02:53 PM

you can download the pdf instructions right there, simply put the provided bung into your exhaust stream after your headers, at a 45* angle, and hook up the supplied stuff,

I got mine installed into my downpipe last night, not much at idle, but when he revved it up free revving, it def had some suction to it, so i devised a twin check valve system to between the manifold and valley, this way even at Idle, i will always have vacuum on the valley.

Pretty simple, the moroso bungs/nipples have built in check valves, so i only needed one on the manifold and one on the valley, piece of cake, under boost, it will have the exhaust vac, and under light throttle it will have manifold

**Texas Jack** · 03-20-2011, 11:27 AM

Originally Posted by JAX04

Sarge, how do you feel about exhaust scavenging?? Im going to give it a go on my new setup, it makes sense that would it would only pull more vacuum as exhaust speed increases.

Im going to atleast try it, but would you recomend using a catch can between the valve covers and the exhaust??

also, would you recomend pulling from the valve cover as well with this type setup.

the kit i ordered from moroso came with two nipples and two check valves. so i was thinking tying the two valve covers to one nipple and the valley to its own. it would always be under vacuum even under boost. do you feel like this is a good option??

That is a cool system, learned something new and how simple it is. Thanks, Jax!!