Mulletrocket

so i have a 75 camaro with lq4 6.0. s475 turbo, holley single plane intake with the poweradder fitech throttle body. motor has factory valve covers. has a ls6 valley cover. How should i set up the PCV system?


Thank you

truckdoug

iTrader: (25)

draw clean air in through the valve covers

"dirty" air exits the ls6 valley cover port

to a catch can where the vapors are collected

use manifold vacuum and a check valve to pull vapors through the can

truckdoug

iTrader: (25)

or only draw clean air on one cover and send the other to a second "blowby" can to catch anything pushed out of the crankcase under boost.

i think those are the two most common sets ups

other than no pcv system at all, which is probably the most popular

Mulletrocket

ok thank you for your input. it is much appreciated. The only thing that concerns me is pulling vacuum through the valley cover and venting the valve covers makes the motor run like it has a moderate vacuum leak. I guess there is no way around that?

forcd ind

iTrader: (7)

I orig used the LS6 valley breather, it sucked oil into the intake-I switched it to the valve cover, added an oil separator, and a ck valve, and a filter where the oil cap was.

truckdoug

iTrader: (25)

with a PCV valve it shouldnt be real bad. you may need to re-adjust your IAC steps and throttle valve screw/TPS


here's a link to how to do that.

https://sites.google.com/site/sloppy...ls/iac-relearn


matt mentions he gets 40-60 steps with a cammed motor....i guess my cams a little bigger since the best i get is about 80 steps with the TB jacked so far the screw is just dangling by a thread lol

brandon6.0

iTrader: (32)

To much running airflow will make one have to many counts.

forcd ind

iTrader: (7)

When I switched my PCV system, it thru the idle off a little (Holley HP).
Since I man. tune it below 1500, the map sensor was reading in a diff area, so I just changed it so it was happy.

Loud Mouse

I have a LY6 6.0. I removed the metal barb in each valve cover, threaded each hole to 1/4 mnpt, ran 3/8 hose to the sides of a vented catch can. I also drilled a hole in the valley cover and threaded it to 3/8 mnpt. Ran 1/2" hose to the bottom of the same catch can. On the top of catch can is a small 2.5" air filter. This works great and any oil that's pushed into the can drains back into the engine when it's not running. Yes my can is higher than the valley cover. This is also on an airboat where my cruz in rpm is constantly 2800 to 3000. Has been working perfectly so far with not a hint of oil out the filter.
il filter

BudRacing

iTrader: (3)

The way around that is to draw air from your intake tube post-MAF. Your throttle body may have a barb provision for a PCV hose. If you're looking at the throttle plate, it's at the top left. Run that to the pass side valve cover and that's your fresh air inlet. I put a metal 3/8" check valve on that line to make sure nothing gets burped back into the throttle body. Then, the LS6 valley cover outlet gets routed into a can, the output of the can goes to the intake post-throttle body.

transam69230

iTrader: (49)

One vent off each valve cover welded in the front to a catch , and done.

No risk of contamination into the intake at all.

I don't get why people try to complicate this soo much!

Loud Mouse

If it's done the way Budracing says you will be applying boost to the valve cover via the port on the throttle body and it venting out through the valley cover. That would not be a desirable or correct way. Either vented to atmosphere or all sealed with pcv would be correct. On anything boosted I always use vented.

BudRacing

iTrader: (3)

Sorry, halfway through the responses I forgot this was for a turbo application. #Monday

In a turbo setup I'd definitely be running a draft can.

truckdoug

iTrader: (25)

It's not complicated, using manifold vacuum to draw vapors out. Most oems do it.

transam69230

iTrader: (49)

Most OEM cars don't make 800rwhp.......

truckdoug

iTrader: (25)

Plenty do these days and there's a pcv system on every one.

Anyways no disrespect bro but it's so easy to set up and the benefits so real I have to think anyone that argues against one is just being stubborn.

transam69230

iTrader: (49)

I will stick with my vent to atmosphere method and zero chances of oil in the intake.

More than one way to skin a cat obviously, its all preference and I don't think there is a right or wrong way to do it. Vent to atmosphere less complicated way to do it and it works.

I haven't had a single issue doing it this way with over 1300rwhp to the tires.

Mulletrocket

Thanks for the reply's guys it helped me alot. Yes it is easy to over complicate ha. This is my first ls turbo build so its been a learning curve for me. I've always been a N/A big block guy but i wanted to try this build since everyone is doing it and making crazy power. im not gonna push it too hard since it is a stock shortblock with gapped rings. cammotion stage 1 turbo cam. ported 317s and ported holley single plane. id be happy with 500-600 rwhp. hopefully it will spool decent. running up and forward turbo headers with 2.25in. tubing divided all the way to the turbo. And lots of heat wrap.

01CamaroSSTx

iTrader: (3)

I would set it up like Loudmouth.

01CamaroSSTx

iTrader: (3)

Loud Mouse.. I'm not a turbo car yet but have 10AN lines from the valve covers to a similar breather can.