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Oil catch can?

C25A1guy

By C25A1guy
in Engines & Drivetrain

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ToesonTheNose
ToesonTheNose

Here at RX now they are doing a video install on my truck

Jay700
Jay700

My dealership said my catch can wasn't needed and wouldn't catch anything. I opened it in there shop after 2,000 miles and let it run on the floor. Lol

fondupot
fondupot

So, I added a second output fitting to my Original RX catch can. I had been emailing with the RevExtreme folks about the benefits of a dual output can, and they were gracious enough to send me the par

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Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

Install went well. I will try to post photos this week. A couple of things:

 

1). Unless you want to cut the factory hose to re-use the snap lock connections, you definitely need hose clamps to connect the black hose to the nozzles on the engine. I did them on the catch can end for extra stability but they really aren't necessary there.

 

2) the clean side lines had oil in them but the throttle body was clean and dry and the airbox was clean and dry. I have the 5.3.

 

3). I'm noticing an increased vibration in the gas pedal at certain gears and RPM's but cruising it's not there. I will keep my eye on that.

 

 

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Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

I guess to be fair I always felt a slight vibration but it seems more pronounced now. I dunno....

 

 

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Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

It's all in your head

 

 

Ryan

I'm sure you're right! How do you guys post pictures on this forum usually?

 

 

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Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted (edited)

Is the middle valve on the RX can supposed to be able to be rotated? Because I had to rotate it 180 degrees to get everything to fit right because it was backwards based on the pictures everyone else here has been posting. Seems fine, just wanted to be sure.

 

 

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Edited by Silverado-Hareek
Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted (edited)

I took a peek under the hood today. I took the attached pictures, on these pictures where is the line I need to replace when installing a catch can? My Sons looked and they believe I may need two. Both sides have a line going from the valve cover to the intake. What is the scoop? I'll post the 2nd picture separately it won't let me do them at the same time. . Thanks.

 

Here you go check out post #153: http://www.gm-trucks.com/forums/topic/154204-oil-catch-can/page-11

 

The lines you are taking pictures of are the clean side lines of your valve covers. RX makes a clean side separator for the driver's side line (pictured above) but they do not have a solution for the passenger side line (your second photo). According to what I've read on this forum and other internet research, the catch can will catch 99% of the crap going into your intake and caking up on the valves. The clean side separator will help even more, but again there's no solution yet for the passenger side. I installed my RX can yesterday and I checked both of these clean side lines. They had some oil in them but the airbox was pretty much dry and clean and my throttle bottle was spotless. I have the 5.3L V8. If you have the 6.2L V8, your throttle body will have oil on it because the inlet for the PCV system is on top of the throttle body rather than on top of the intake manifold like on the 5.3L engine (see pictures in post #153 I linked to above).

Edited by Silverado-Hareek
  • Like 1
JimmyVal Enthusiast

JimmyVal

Posted
Posted

It's all in your head

 

 

Ryan

Ryan,

 

I don't think it's all in their head. After I installed the RX can in my truck, there was a noticeable vibration in the gas peddle at certain RPM's. My wife felt the vibrations too when she drove the truck. Believe me it's not imagined.

 

What I did to solve the problem is to move the RX can as far back as I could in the slots on the bracket that mounts the can to the brake booster. I had originally mounted the can forward (toward the front of the truck), to allow easier access to the oil dip stick. Once I moved the can back (towards the firewall), the vibration went away.

 

I think the check valve on the can, which is mounted close to the can itself, transmitted its vibration to the brake booster, which I could feel in the gas pedal. In my case, the gas and brake pedal are mounted on an adjustable pedal assembly. I think by mounting the can on the far end of the bracket amplifies the vibration due to a longer lever arm. (Just my guess)?

  • Like 1
JimmyVal Enthusiast

JimmyVal

Posted
Posted

So I've read through a bunch of this thread trying to learn what's going on. I've never even heard of a catch can, pardon my ignorance. Is this something recommended or just personal preference? I try to maintain vehicles as well as I can. Thanks for any help.

The problem is related to crankcase ventilation and how the vapors are collected by the air intake system and burned and direct injected motors like those used in the new GM trucks.

 

In a non-direct injected engine, the fuel injectors direct their gas flow directly into the air stream at the top in the intake valves. In the air stream at that point, is a small amount of collected oil vapors from the engines crankcase. The gas from the injectors effectively 'washes' the intake value of any oil and the valve remains clean.

 

In direct injection motors, the injector injects gas directly into the combustion chamber, bypassing the intake valve. Oil vapor, however is still introduced into the intake air stream via the crack case venting system. The oil in the intake air stream begins to collect on the intake valves and hardens over time. (There are a number of you tube videos that show the mess this creates on the valves).

 

Oil catch cans try to remove as much of the oil as possible from the crank case vapor, therefore leaving the intake valves clean or cleaner!

Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted (edited)

Ryan,

 

I don't think it's all in their head. After I installed the RX can in my truck, there was a noticeable vibration in the gas peddle at certain RPM's. My wife felt the vibrations too when she drove the truck. Believe me it's not imagined.

 

What I did to solve the problem is to move the RX can as far back as I could in the slots on the bracket that mounts the can to the brake booster. I had originally mounted the can forward (toward the front of the truck), to allow easier access to the oil dip stick. Once I moved the can back (towards the firewall), the vibration went away.

 

I think the check valve on the can, which is mounted close to the can itself, transmitted its vibration to the brake booster, which I could feel in the gas pedal. In my case, the gas and brake pedal are mounted on an adjustable pedal assembly. I think by mounting the can on the far end of the bracket amplifies the vibration due to a longer lever arm. (Just my guess)?

 

It's definitely not imagined. I pay attention to every squeak, noise, bump etc. in this truck and the vibration in the pedal is definitely more noticeable than it ever was. I always felt a slight vibration before but it was very faint...so faint I didn't think I had the problem people were describing on this forum. But now after the catch can install, it's definitely more pronounced and I understand what others have been feeling and complaining about on their stock trucks.

 

My can is already mounted as far back (or toward the cab of the pickup) as possible on the bracket. I did this to provide easier access to the oil cap for oil changes. At any rate, the computer isn't throwing any codes and the engine and exhaust sound fine. As long as nothing damaging is taking place I can live with what I feel in the pedal. I'm just hoping it's not something bad that's causing damage over time that will eventually show up as a big problem or repair.

Edited by Silverado-Hareek
Aldila Enthusiast

Aldila

Posted
Posted

The problem is related to crankcase ventilation and how the vapors are collected by the air intake system and burned and direct injected motors like those used in the new GM trucks.

 

In a non-direct injected engine, the fuel injectors direct their gas flow directly into the air stream at the top in the intake valves. In the air stream at that point, is a small amount of collected oil vapors from the engines crankcase. The gas from the injectors effectively 'washes' the intake value of any oil and the valve remains clean.

 

In direct injection motors, the injector injects gas directly into the combustion chamber, bypassing the intake valve. Oil vapor, however is still introduced into the intake air stream via the crack case venting system. The oil in the intake air stream begins to collect on the intake valves and hardens over time. (There are a number of you tube videos that show the mess this creates on the valves).

 

Oil catch cans try to remove as much of the oil as possible from the crank case vapor, therefore leaving the intake valves clean or cleaner!

WOW. Thanks for the help. I guess I need to look into one. Do they sell them kit specific to these trucks? If not, what setup is recommended?

JimmyVal Enthusiast

JimmyVal

Posted
Posted (edited)

WOW. Thanks for the help. I guess I need to look into one. Do they sell them kit specific to these trucks? If not, what setup is recommended?

I've been trying to respond with details to your question, but for some reason the post doesn't go. PM fails too. I'm going to try to send it in multiple small posts:

 

RX does, but it's not obvious when you order the kit. When I ordered mine, they did not list the 2014 Sierra in the drop down. Others suggested picking something similar from the drop down. I believe I picked Camero. Then when you advance to the next page, there is a place where you tell them the exact application. You can also select the color of the can. I selected black as they didn't list Sonoma Red.

 

 

Edited by JimmyVal

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