Oil catch can?

ToesonTheNose · November 23, 2015

i dont understand why you added a second hose to the can. i know you stated to increase catch. But how? thats too close for comfort for me drilling into intake near TB

fondupot · November 23, 2015

You sir, are the man!!

Ahah, thanks

fondupot · November 23, 2015

i dont understand why you added a second hose to the can. i know you stated to increase catch. But how? thats too close for comfort for me drilling into intake near TB

It's more to help when accelerating heavily or when at WOT. To maintain a vacuum so that the blow by continues to filter through the catch can, therefore catching more oil and contaminates.

This is what GDI tech told me:

"This will get a checkvalve inline also, flowing away from the can as well. What it does it by drilling the hole where I specified, you access the same outlet chamber shown in the diagram, so the checkvalves will open and close as needed always using the strongest suction source for evacuation and preventing any back-flow.

Right now you only have the intake manifold vacuum for evacuation suction, and as soon as you accelerate, the reversion pules caused by the valve overlap (the cam lobes) this cancels out any usable vacuum inside the IM, but it does not reach past the throttle body until over 8,000 RPM so you will be tapping into the area just in front (upstream) of the throttle body when accelerating or at WOT for the strongest alternative source of suction. So no matter what, you are evacuating the damaging combustion by-products from the crankcase before they can settle and mix with the oil. You may have noticed GDI engines the oil turns dark right away after a change. this is the added amount of abrasive particles entering so you will now be improving on the OEM PCV design by always evacuating. This will keep the oil cleaner longer and less wear from the particles as well as keeping the intake valves as deposit free as possible."

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Edited November 23, 2015 by fondupot

Silverado-Hareek · November 23, 2015

So you're just protecting your oil from extra contamination but this doesn't change anything with regards to protecting the valves from build up correct?

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Edited November 23, 2015 by Silverado-Hareek

fondupot · November 23, 2015

So you're just protecting your oil from extra contamination but this doesn't change anything with regards to protecting the valves from build up correct?

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Well yes. That's the whole point of a catch can.

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Silverado-Hareek · November 23, 2015

Well yes. That's the whole point of a catch can.

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I thought the point of a catch can is to keep contaminants and oil in the PCV gases from entering your combustion chamber and reducing horsepower and performance due to the contaminants' affect on the combustion process and the engine compensating for the presence of those contaminants. Which is why race car drivers use them to help eliminate variables from the combustion process and give the engineers more control over the performance of the vehicle to maximize power and efficiency.

In the case of DI engines, there's an added side benefit of keeping your valves clean since these contaminants aren't making contact with the valves which can't be cleaned by fuel washing over them as it would in port injection engines.

In the case of your modification, deposits wouldn't touch your valves in either your original setup or your modified setup because of the presence of the catch can and the fact that PCV gases have to be routed through the can regardless in either of your scenarios. What I'm understanding in your modification is that in cases of WOT when there is no vacuum effect from the intake manifold, normally this would just shut down the PCV system all together but you're modifying it so that a vacuum force remains thus continuing the evacuation of gases from the crankcase where they otherwise would remain until your PCV system activates again when you're not in WOT anymore. So this modification just keeps the contaminants from settling in your crankcase while the PCV system is shut down. I agree that would extend the life of your oil by keeping it cleaner.

Is my understanding correct? I'm not judging or anything like that man, I'm just trying to understand what this modification does.

fondupot · November 23, 2015

I thought the point of a catch can is to keep contaminants and oil in the PCV gases from entering your combustion chamber and reducing horsepower and performance due to the contaminants' affect on the combustion process and the engine compensating for the presence of those contaminants. Which is why race car drivers use them to help eliminate variables from the combustion process and give the engineers more control over the performance of the vehicle to maximize power and efficiency.

In the case of DI engines, there's an added side benefit of keeping your valves clean since these contaminants aren't making contact with the valves which can't be cleaned by fuel washing over them as it would in port injection engines.

In the case of your modification, deposits wouldn't touch your valves in either your original setup or your modified setup because of the presence of the catch can and the fact that PCV gases have to be routed through the can regardless in either of your scenarios. What I'm understanding in your modification is that in cases of WOT when there is no vacuum effect from the intake manifold, normally this would just shut down the PCV system all together but you're modifying it so that a vacuum force remains thus continuing the evacuation of gases from the crankcase where they otherwise would remain until your PCV system activates again when you're not in WOT anymore. So this modification just keeps the contaminants from settling in your crankcase while the PCV system is shut down. I agree that would extend the life of your oil by keeping it cleaner.

Is my understanding correct? I'm not judging or anything like that man, I'm just trying to understand what this modification does.

You're exactly correct. That is the goal of the second exhaust port on the catch can.

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Silverado-Hareek · November 23, 2015

You're exactly correct. That is the goal of the second exhaust port on the catch can.

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So in the case of my truck where I have the original airbox and not an aftermarket tube like you, would I just connect the 2nd outlet hose from the catch can to the inlet port on the passenger side of the air box assuming I have a clean side separator connected to the port on the driver side?

And do you need a clean side separator for this set up to work? It seems you would.

fondupot · November 23, 2015

So in the case of my truck where I have the original airbox and not an aftermarket tube like you, would I just connect the 2nd outlet hose from the catch can to the inlet port on the passenger side of the air box assuming I have a clean side separator connected to the port on the driver side?

And do you need a clean side separator for this set up to work? It seems you would.

Actually, you would still want to get that 2nd exhaust port as close to the throttle body as possible. The CSS would be connected to that port on the driver side of the intake tube. The passenger side port on the tube would be capped off. And the valve cover breathers would be linked together with a hose.

And the 2nd exhaust port would still be drilled in and installed as close to the throttle body as you can get. See pics below:

Silverado-Hareek · November 23, 2015

Actually, you would still want to get that 2nd exhaust port as close to the throttle body as possible. The CSS would be connected to that port on the driver side of the intake tube. The passenger side port on the tube would be capped off. And the valve cover breathers would be linked together with a hose.

And the 2nd exhaust port would still be drilled in and installed as close to the throttle body as you can get. See pics below:

Oh ok. Is that to maximize the vacuum force with the throttle body all the way open? Less suction if it's further away from the throttle body?

fondupot · November 23, 2015

Oh ok. Is that to maximize the vacuum force with the throttle body all the way open? Less suction if it's further away from the throttle body?

Yes. Exactly. the further you get from the throttle body, the less suction there is. Which is why you want the CSS mounted as far away from the TB as you can, you don't want the CSS to suck any oil, you just want it to have a vent for fresh air.

Silverado-Hareek · November 23, 2015

Yes. Exactly. the further you get from the throttle body, the less suction there is. Which is why you want the CSS mounted as far away from the TB as you can, you don't want the CSS to suck any oil, you just want it to have a vent for fresh air.

Interesting thanks for the education man. I definitely want to add a CSS at some point.

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fondupot · November 23, 2015

Interesting thanks for the education man. I definitely want to add a CSS at some point.

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For me it was a necessity. The Airaid MIT made the valve cover vents pull a lot of oil mist into the intake tube, which over time accumulated and dripped down into the airbox.

The OEM intake tube, has baffles built into the air tube to reduce this effect. But I would still recommend the CSS even with the OEM intake tube.

GDI Tech · November 23, 2015

Sorry have not been on for a few days, but appears fondupot got all questions answered correctly! Great job!

What occurs when accelerating or at WOT when no vacuum is present for evacuation, the compounds you do not want to settle and mix with the oil are, so this not only does all described above, but also keeps your oil more contaminat free longer. The goal is to have constant evacuation at all times, and the dual valve systems do this.

bladz1454 · November 23, 2015

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 parts needed to convert my single output can into a dual output can. With some simple instructions they explained to me how to add the second fitting. So this morning I gathered the tools needed and decided to document the whole process. It didn't take long at all. Maybe 2 hours (but I was filming).

Here it is:

Haha darnit fondupot, I've been very pleased with my Duel Can setup but now I'm tempted to toss a second evacuation port on the cans!