Crank Case Venting - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

RupertPupkin · 03-22-2021, 03:07 PM

For you high HP boosted guys, what are your setup to relieve crank case pressure. I have the Mighty Mouse Wild Catch can, which I thought would work, but it didn’t. I want to keep that setup, but what other configuration can I do.

I chatted with Mighty Mouse and they said I can put a pcv line from the driver cover to the filter/charge pipe of my ECS blower. However, I would think it will pull oil in the S/C doing it that way.

Bo White · 03-22-2021, 04:41 PM

I run 2 catch cans. One dirty side like yours and one clean side like Mighty Mouse suggested.

RupertPupkin · 03-22-2021, 05:01 PM

Quote:

Originally Posted by Bo White

I run 2 catch cans. One dirty side like yours and one clean side like Mighty Mouse suggested.

You ever pulled oil? What catch can for the driver side?

dreksnot · 03-22-2021, 05:13 PM

Interesting.... I have my MM installed like yours (but with the check-valve on the can connector instead of inline like your gray color check-valve). In addition, I have a small vent can installed on my driver's side valve cover connector on the rear of the valve cover. I can run 27psi boost so far...

RupertPupkin · 03-22-2021, 06:01 PM

Quote:

Originally Posted by dreksnot

Interesting.... I have my MM installed like yours (but with the check-valve on the can connector instead of inline like your gray color check-valve). In addition, I have a small vent can installed on my driver's side valve cover connector on the rear of the valve cover. I can run 27psi boost so far...

There’s a check valve in the can also, right by the filter.

Badbubba · 03-23-2021, 02:26 PM

What's the purpose of the filter on top of the MM can? Is there a check valve associated with it to vent to atmosphere if there is pressure? Similiar to the CFM breather. What's the routing of the clean side? I'm guessing that the check valve connected inline with the hose to the intake is to prevent boost pressure from going into the can and crankcase. Could it be installed backwards or not working correctly? Is there an arrow on the valve? Does the other check valve mentioned serve the same purpose? At idle, if you remove the line at the oil filler, you should have vacuum pulling towards the can. It may buck and stumble when you pull it off, due to unmetered air entering the intake.
Most catch cans have 3 ports for supercharged applications. Or use 2 cans.

dreksnot · 03-23-2021, 03:33 PM

Quote:

Originally Posted by Badbubba

What's the purpose of the filter on top of the MM can? Is there a check valve associated with it to vent to atmosphere if there is pressure? Similiar to the CFM breather. What's the routing of the clean side? I'm guessing that the check valve connected inline with the hose to the intake is to prevent boost pressure from going into the can and crankcase. Could it be installed backwards or not working correctly? Is there an arrow on the valve? Does the other check valve mentioned serve the same purpose? At idle, if you remove the line at the oil filler, you should have vacuum pulling towards the can. It may buck and stumble when you pull it off, due to unmetered air entering the intake.
Most catch cans have 3 ports for supercharged applications. Or use 2 cans.

Check valve allows unmetered airflow FROM filtered catch can to the throttle body connection. When positive pressure in the intake manifold (in boost), the check valve closes preventing a "boost leak" out the can. The larger hose connected from the oil filler cap to the catch can serves to vent the crank case, and also allows a slight venting of the valve cover pulling smellies back into the motor under idle and normal driving (no boost).

Not sure why he has two check valves installed (MM includes one in the can fitting and he has the gray one inline).

I have seen oil spattering (as seen in his picture) when my catch can is filling up, needing to be drained.

dreksnot · 03-23-2021, 03:40 PM

You asked to see my 2nd installed catch can on my driver's side. It only serves as a secondary path to vent crank case pressure. It's connected to the rear vent port on the driver's side valve cover. So far 27psi boost and no blown main seals.

eLeSthree · 03-23-2021, 04:55 PM

Easiest way to prevent seals from popping out is to vent both valve covers to a can that has a filter on it. Now if you want a dual purpose system that actually cleans your air, then it gets more complicated. I have noticed, with my cam, and driving frequency, i dont really need one. I pulled the intake a while back and there was 0 signs of oily residue.

Let the boost out or you will be pulling your motor to fix seals. Sucks.

joshnmn · 03-23-2021, 07:15 PM

I’m not nearly high hp or high boost but I run Motion raceworks burndown tubes with their catch can venting each cover with an10 hose.

RupertPupkin · 03-23-2021, 08:54 PM

Quote:

Originally Posted by dreksnot

Check valve allows unmetered airflow FROM filtered catch can to the throttle body connection. When positive pressure in the intake manifold (in boost), the check valve closes preventing a "boost leak" out the can. The larger hose connected from the oil filler cap to the catch can serves to vent the crank case, and also allows a slight venting of the valve cover pulling smellies back into the motor under idle and normal driving (no boost).

Not sure why he has two check valves installed (MM includes one in the can fitting and he has the gray one inline).

I have seen oil spattering (as seen in his picture) when my catch can is filling up, needing to be drained.

The hoses I got from MM already had the check valve fitted on there already. There’s actually no oil in my can. The splatter is from my crank seal leaking a lot from me doing pulls.

Quote:

Originally Posted by eLeSthree

Easiest way to prevent seals from popping out is to vent both valve covers to a can that has a filter on it. Now if you want a dual purpose system that actually cleans your air, then it gets more complicated. I have noticed, with my cam, and driving frequency, i dont really need one. I pulled the intake a while back and there was 0 signs of oily residue.

Let the boost out or you will be pulling your motor to fix seals. Sucks.

Yeah. Def sucks, which is part of the game. I just rolled snake eyes.

I’m thinking of altering my setup.

1. Keep MM wild setup- oil fill to the can, then hose from can to intake/tb nipple.
2. Vent filter breather on driver side (no check valve)
3. Vent filter breather connected to valley nipple (with check valve).

Will this work? What can be swapped?

Badbubba · 03-24-2021, 12:39 AM

Quote:

Originally Posted by dreksnot

Check valve allows unmetered airflow FROM filtered catch can to the throttle body connection. When positive pressure in the intake manifold (in boost), the check valve closes preventing a "boost leak" out the can. The larger hose connected from the oil filler cap to the catch can serves to vent the crank case, and also allows a slight venting of the valve cover pulling smellies back into the motor under idle and normal driving (no boost).

Not sure why he has two check valves installed (MM includes one in the can fitting and he has the gray one inline).

I have seen oil spattering (as seen in his picture) when my catch can is filling up, needing to be drained.

Yeah. Sort of figured the dirty side was from the oil filler neck, since there was no connection to the valley cover or valve cover. But wasn't sure about the breather. If the breather is open to atmosphere, then that creates a parallel path to the intake manifold side of the throttle. So at low rpm, the crankcase is not getting evacuated very well. That may be the reason Rupert states there is no oil in the can. But at high rpm and increased crankcase pressure, the pressure should vent out the breather without an issue. Imo, the breather should have a check valve to not allow outside air in. Now back to crankcase pressure. If the clean side is connected to the intake tube, for n/a, then that would pressurize the crankcase. Or if the check valves are not installed or working correctly, could cause pressure. Even if the hoses were on the wrong port would cause issues, which doesn't appear to be the case.

Badbubba · 03-24-2021, 12:54 AM

Quote:

Originally Posted by RupertPupkin

The hoses I got from MM already had the check valve fitted on there already. There’s actually no oil in my can. The splatter is from my crank seal leaking a lot from me doing pulls.

Yeah. Def sucks, which is part of the game. I just rolled snake eyes.

I’m thinking of altering my setup.

1. Keep MM wild setup- oil fill to the can, then hose from can to intake/tb nipple.
2. Vent filter breather on driver side (no check valve)
3. Vent filter breather connected to valley nipple (with check valve).

Will this work? What can be swapped?

How is the clean side routed now?

RupertPupkin · 03-24-2021, 06:48 AM

Quote:

Originally Posted by Badbubba

How is the clean side routed now?

Nothing is connected on the clean side.

03-22-2021, 03:07 PM	#1
RupertPupkin Drives: 2014 Camaro SS 1Le Join Date: Feb 2016 Location: IL Posts: 1,583	Crank Case Venting For you high HP boosted guys, what are your setup to relieve crank case pressure. I have the Mighty Mouse Wild Catch can, which I thought would work, but it didn’t. I want to keep that setup, but what other configuration can I do. I chatted with Mighty Mouse and they said I can put a pcv line from the driver cover to the filter/charge pipe of my ECS blower. However, I would think it will pull oil in the S/C doing it that way. Attached Images __________________ 2014 SS 1LE Money Pit/ Forged 402 CAM 22X/24X, .619/.617, 113 LSA/ LS9 Heads FIC 1200cc/DSX Aux Pump//McLeod RXT Clutch 730whp: 630Trq

03-22-2021, 04:41 PM	#2
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	I run 2 catch cans. One dirty side like yours and one clean side like Mighty Mouse suggested. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

03-22-2021, 05:13 PM	#4
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,603 View My Garage	Interesting.... I have my MM installed like yours (but with the check-valve on the can connector instead of inline like your gray color check-valve). In addition, I have a small vent can installed on my driver's side valve cover connector on the rear of the valve cover. I can run 27psi boost so far... __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

03-23-2021, 02:26 PM	#6
Badbubba GrINned & JUICEd Drives: 15STI, 10Expy, 10 2SS/RS M6, 47KB1 Join Date: Nov 2009 Location: Pittsburgh, PA Posts: 1,247	What's the purpose of the filter on top of the MM can? Is there a check valve associated with it to vent to atmosphere if there is pressure? Similiar to the CFM breather. What's the routing of the clean side? I'm guessing that the check valve connected inline with the hose to the intake is to prevent boost pressure from going into the can and crankcase. Could it be installed backwards or not working correctly? Is there an arrow on the valve? Does the other check valve mentioned serve the same purpose? At idle, if you remove the line at the oil filler, you should have vacuum pulling towards the can. It may buck and stumble when you pull it off, due to unmetered air entering the intake. Most catch cans have 3 ports for supercharged applications. Or use 2 cans. __________________ GPI SS3 Cam & stuff,N.O. Plate(dedicated fuel tank,progressive,fuel hose upgrade,remote opener,heater,console switches),LNC2000,CTAP,ARH 1 7/8" LTs/gutted cats/X pipe/mufflers,Jet Hot coated LTs,GPI HPT Tune,CAI, Scoop,Rx Catch Can,Gates heater hose relocation, Remote clutch & auto brake res,Metco loop,Momentum Tunnel Brace,TSW Nurb 18",555 & 05,Pfadt trailing arms & toe rods,Autometer WB,Fesler Pillar Pod,LED strips (int),Lloyds floor & trunk mats,LED DRL/front turn & license plate,DRL harness,VLEDs tail lights,Plasticoat Bowties. Ord: Oct 5, 2009 Rec: Nov 19, 2009 13.17@112.6 stock

03-23-2021, 03:40 PM	#8
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,603 View My Garage	You asked to see my 2nd installed catch can on my driver's side. It only serves as a secondary path to vent crank case pressure. It's connected to the rear vent port on the driver's side valve cover. So far 27psi boost and no blown main seals. Attached Images __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

03-23-2021, 04:55 PM	#9
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	Easiest way to prevent seals from popping out is to vent both valve covers to a can that has a filter on it. Now if you want a dual purpose system that actually cleans your air, then it gets more complicated. I have noticed, with my cam, and driving frequency, i dont really need one. I pulled the intake a while back and there was 0 signs of oily residue. Let the boost out or you will be pulling your motor to fix seals. Sucks. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

03-23-2021, 07:15 PM	#10
joshnmn 2&THEHIT Drives: 5th Gen Camaro; 5th Gen Ram 3500 Join Date: Mar 2018 Location: Garner, NC Posts: 1,012 View My Garage	I’m not nearly high hp or high boost but I run Motion raceworks burndown tubes with their catch can venting each cover with an10 hose. Last edited by joshnmn; 03-23-2021 at 07:28 PM.