I searched for it and found instructions on how to mount oil catch can. Well, I know what it does but the question is, do I, owner of a LS engine, with no FI, collect any benefits as far as health of engine is concerned?

 

You will see no benefit to running a catch can on a non FI car. You will actually hurt the car by running one, so just keep the stock PCV system.

X2

 

More info:

http://www.theoldone.com/components/breather/

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by X2BOARD &raquo;</TD></TR><TR><TD CLASS="quote">You will see no benefit to running a catch can on a non FI car. You will actually hurt the car by running one, so just keep the stock PCV system.

X2</TD></TR></TABLE>

How so? Bret (BSQ) runs one on his N/A car and I think he's pretty happy with it. I've seen LOTS of N/A setups using an oil catch can.

 

i have a open setup. i run a hose from the black can behind the block to my catch can (cusco). on the outlet of my car i have a breather on it. dont need no stinkin pcv valve, dont work under boost anyway. on the opening on the IM i have it as a vacumn source for the w/g. the valve cover breather thing is just open.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by X2BOARD &raquo;</TD></TR><TR><TD CLASS="quote">You will see no benefit to running a catch can on a non FI car. You will actually hurt the car by running one, so just keep the stock PCV system.

X2</TD></TR></TABLE>

I also disagree

Buy adding a catch can you are preventing sludge buildup in your IM/TB/Intake, as well as preventing oil vapors from traveling into the intake manifold, which just takes up space so you get less fresh air into the engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PatrickGSR94 &raquo;</TD></TR><TR><TD CLASS="quote">

How so? Bret (BSQ) runs one on his N/A car and I think he's pretty happy with it. I've seen LOTS of N/A setups using an oil catch can.</TD></TR></TABLE>

I'm not totally familiar w/ BSQ's setup, but here's my take. I have researched catch can and PCV systems some time ago for my boosted setup and have run a CC on a boosted and all motor setup, both open and closed loop, both with and without a PCV valve and even used PCV's from different car manufacturers.

Once again, there are people that think they are smarter than Honda Engineers...lol

*Although it's an emissions addition, a car that incorporates a Closed Loop PCV system was designed to work with it.

One of the main purposes of a catch can system is to trap escaping OIL and VAPOR, seperating the two and (in some cases) returning the OIL itself to the crankcase. The reason you need a actual can is that in some engine conditions (FI, high CR), the oil (not just vapor as with a stock car) will actually spit out of the PCV and be trapped in the can.

The reality is... a lightly modded car (stock CR, no FI) has absolutely no use for a catch can or breather valve (or both). The car is harly creating enough blow by gases to necessitate a catch can setup. As these cars will not spit oil with the vapor. Boosted (and even nitroused) cars NEED a CC system due to the drastic increase in blowby due to an FI car's dynamic compression. Some FI apps can even forego the actual PCV valve, but I'd only do that under a full race app.

Higher CR all motor apps typically will not facilitate the use of a catch can system unless you are delving into the 12's +.... otherwise a stock PCV system can handle the extra pressure.

Remember... the PCV system operates under vaccum (Idle) and the ecu knows this and adjusts idle quality with this in mind. Just because they sell parts, doesn't neccessarily mean it will aid the car's performance. Breather filters, for instance, on nearly stock setups (factory internals) is doing nothing but screwing with function of the PCV system... I never understand why people even use them...

X2 (Sorry for the long post and no cliffs... it's not a kill story )

 

I still don't see how you figure its BAD to have a catch can on a NA engine.

The function of the PCV system is still intact, all it does it capture the oil vapors instead of recurculating them. There still is a PCV valve, the vaccum is not altered in any way. Instead of a straight hose back to the IM, there is a can that captures oil vapors. Nothing else is changed.

I get about 1/2 a cup of oil in my catch can per oil change (5,000 miles). Thats plenty to me.

 

Um... if you disconnect the hose from the mani... you disable the entire PCV system. It's a closed loop system... take off one part... and it stops the system's function.

X2

 

thanks for both arguments but, now I don't know whether I should invest in a CC or not.

 

if you got 100 bucks to spare go for it....if your tight on a budget then maybe save the 100 for something else..like umm coil overs

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by X2BOARD &raquo;</TD></TR><TR><TD CLASS="quote">Um... if you disconnect the hose from the mani... you disable the entire PCV system. It's a closed loop system... take off one part... and it stops the system's function.

X2</TD></TR></TABLE>

Its not disconnected, there is just a catch can inbetween the connection to the mani and the head.

 

Well do you still have the vac line to the PCV ? If you have a filtered catch can connected inline of the vac hose... the PCV won't operate the way it's designed to.

X2 (I'm out... all motor + catch can= Waste of money.)