Is a Catch Can the same thing as a Breather Box?

panelman61 · May 15, 2013

I used to work on High Performance VW's for a while and we always put a "breather box" on them to catch the blow by before it got to the intake for the dual carb'd big motors. From what I'm seeing, it seems that a catch can does the same thing. Am I correct in thinking this? There's a lot of really nice looking ones that I have in my head if so.

Stangshcky12 · May 15, 2013

Certainly sounds like it from the description
Catchcans separate the blow by from the PCV before venting back into the intake

audio1der · May 15, 2013

Sure sounds like it.
There are lots of eBay options, Billet Technology/Diablosport (same can, re-labled), Moroso and even Home Depot options designed for exactly this task but on compressor setups. Choose you poison!

Casper · May 15, 2013

panelman61 said:
I used to work on High Performance VW's for a while and we always put a "breather box" on them to catch the blow by before it got to the intake for the dual carb'd big motors. From what I'm seeing, it seems that a catch can does the same thing. Am I correct in thinking this? There's a lot of really nice looking ones that I have in my head if so.

Conceptually and functionally the same. A filter, or multiple changes of directions (seperator), a pressure or a velocity change (nozzle) or a temperature decrease (condenser) are all mechanisms that can be used to cause aerosolized oil to return to a liquid state that can then be collected to prevent reintroduction into the intake manifold. In larger gear trains (reduction gears, heavy machinery etc) an electro-static vent fog percipitator serves a similar function to keep volitized and potentially flammable lube oil mist out of the atmosphere--and the operator's lungs. :patriot:

Is a Catch Can the same thing as a Breather Box?

panelman61

Junior Member

Stangshcky12

Senior Member

audio1der

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Casper

U.S. Navy (Ret.)

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