Anyone using one of these? Maybe homemade. How well does it work?

 

Not needed on carb'd engines. The fuel from the carb keeps the induction system cleaned of any shmoo sucked up by the PCV.

 

Not the point. It's to filter out oil fumes from the crankcase that gets burned in the carb and contaminates the mixture.

 

Does not matter carb compensates for this and fuel mix settings and jetting compensates for this. And the separator won't separate out the combustible elements anyway or the oil vapour fumes.
You are looking for a solution to a problem that does not exist. The only reason they use separators on a sound engines is help prevent (still won't stop it fully) intake or valve deposits on port-injected or direct-injected engines..

 

I do run a separator on mine. The carb does pull air for some circuits from the bottom of the baseplate. Does keep the carb internals a little cleaner. Don’t know if it’s worth it or not. Does collect some sludge. Not a lot. I clean it a couple times a year. Bought a cheap one of eBay and it leaked. Spent a little more on something decent and it’s worked well for me.

 

There very popular on late model engines, especially boosted ones. What comes throught the PCV is not metered by the carb nor is it a very good fuel.

 

Does not matter if is good fuel or not. And it is metered by the PCV. The carb is calibrated for the flow from the PCV. And the combustible hydrocarbons from the crankcase that flow through the PCV are so infinitesimally small it has no effect on the combustion and will richen the mix to such a small degree you would barely pick it up on tailpipe gas analyzer variations of barometric pressure and humidity have a larger impact than PCV flow does.

You are looking for a solution to a problem that does not exist. Not sure why you are having a problem understanding this.
Add a separator if you want but you not going to accomplish anything with it other than making your self feel better.

 

I swear by mine. Mounted it near the deer whistle and water injection unit for my 100mpg topseekretskippy carburetor.

 

If you think oil and fumes are good for you combustion fine. The only reason they go there is for emmissions.

 

LMAO a separator is NOT going to stop fumes and the small bit of oil that gets in the mix makes no difference in fact with today's fuels on carb'ds engine it's a benefit as it adds back some of the heavier chains that have been pulled out of gasoline with modern hydrocracking. And you are that your engine burns oil regardless right.
And the PCV's primary benefit is to keep the crankcase purged to prevent sludging. And was done in some application LONG before it was mandated to keep from dumping oil on the road surface.
Again you are trying to find a solution to a problem that does not exist, maybe take the advice of those that actually might know more than you do...

 

If you have enough oil or fumes going through your PCV to make any difference at all you're engine is as whipped as Uncle Buck's Mercury.

 

https://www.americanmuscle.com/catch...g-oil-out.html

For your enlightenment, or not.

 

Alright. Hate to type, but a lot of blanket statements being made. Anyone asked if this is a grocery getter engine or something hotter. Does make a difference and a catch can has its place. Work in a shop that does a lot of horsepower builds and they get installed for a lot of reasons. We use adjustable pcv’s in big cammed carb set ups. Allows us to adjust some air flow without drilling carb butterfly’s. If we need to pull more air we install a can. Whether you think so or not, having a bunch of crap go in to your intake is not a good thing. Intake valve deposit build up, dirty intake and carb and in some cases preigntion from the contaminants. High lift cams with roller rockers sometimes don’t allow good baffling in valve covers. Catch can. Looser ring packs in high compression and boosted engines. Catch can. Not snake oil so at least ask the guy what he’s working on before you bash him. Anybody that thinks they know it all isn’t going to learn much.

 

With carbs, there are no deposits from the PCV as the intake is wet and they are washed out. You will get more deposits from gasoline vanishing than from the PCV. And unless you are building for the very last fraction of HP where you are controlling fuel-air mixture to for max HP under all situations the catch can is not going to provide any benefit simple as that, and that is per actual testing done at Ford.

We tested this exact thing when I was at Ford in the 80's in an effort to see if a vapour trap made any difference in tailpipe emissions. And we could not see any difference AT ALL in combustion efficiency or tailpipe emissions. And these were not just simple catch cans we were testing but actual proper vapour traps like the current unit offered by Ford Performance for the Coyote, not the crap some of the aftermarket passes off.

On DI and Multiport engines where the intakes are dry, a catch can will help alleviate deposits as the intake and throttle plate is dry with NO available fuel to wash stuff down and out, throw in the high EGR duty cycles now being used and is it a perfect recipe for intake coking.
If you are running anything but an all-out performance engine or DI or Multiport at catch can or vapour trap has NO benefit on a sound carburated engine. This not my opinion BUT FACT based on hundreds if not thousands of hours of testing in the engine cell at Ford.

 

Again. Not talking 1980 118 HP Mustang. When you veer from stock things change. Don’t disbelieve the testing results. Also know as FACT that even in a wet intake burnt oil deposits don’t disappear. They are burned in the combustion chamber. Also know that I have seen the dirty carb blades, deposits in secondary metering blocks that pull air from above pcv entry and dirty intakes that go away with a can. And we don’t typically put garbage on 10-20 k engines. You gonna touch on loose ring packs and baffling challenges on street cars that you can’t run header evacs on or owner doesn’t want to spend money on a vacuum pump. I’m out.