LexBrett

Just read an article about Oil Catch Cans. Apparently they collect oil that would otherwise be recycled into intake. Do you think this mod is worth the time??

Bgw70

I have read plenty of opinions over on the other website that handles my Trans Am and Camaros, there are plenty of people that use them on those cars. I thought about it, but did not do it...
Changing the PCV can help reduce any oil that may go into the intake.

tromly

great advice !

LexBrett

What is the difference between the catch and with and without the breather???

Bgw70

I do not understand your question...what breather?

LexBrett

Consider the two pics of oil catch cans. The first pic has a catch can without a breather and the latter does not. What is the purpose of the breather for on the second catch can? It is my understanding that it vents oil-gas mixtures. But wouldn't the venting compromise the vacuum? Or is this breather just for non- NA engines?

Bgw70

Those pics would not show up on my iPad for some reason.

LexBrett

Darn it something is wrong with the upload function on CL..



No breather





breather on top of can

jeffdawgfa

Most new cars have a "dirty side" pcv line a "clean side" supply line on the valve covers to vent the fumes, vapor, and blowback. The dirty side will collect oil and a little water condensation that leaks by the piston rings. This is vented to the intake manifold through the PCV valve and line. Many engines have a "clean side" that prevents the area under the valve covers from operating under a vacuum. Thus you use a catch can without vent filter on dirty side and if you are really hard core a can with filter on clean side supply. Catch cans really only provide a need function on direct injected engines that do not have fuel with detergents spraying on the inlet vales to keep them clean. On DI engines, that oil vapor and mung from the PCV line is sucked back into the intake manifold and cakes and builds up carbon on the intake valves. Under bad conditions, that carbon can rob performance. Also if a chunk of that carbon breaks loose and is sucked in to the cylinder...well, it can damage things. The DI engine does not have a fuel spray to clean valves. Some manufacturers use a combination of port and DI to help clean valves. And lastly, a oil catch can on dirty side helps keep all that oil and crap from coating the inside of the intercooler and the turbo charger. I have one on my 2015 Colorado with DI. I empty about a cup of old oil out of it every 5000K oil change that would have been sucked back into the intake manifold. For around $125 for a good one, it can save you a good $2000 to have your intake valves walnut blasted to remove carbon build up.