Who's running a catch can?

J. Dub

Who's running a catch can and did it come with your kit or did you rig something up yourself?

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RCZ

Only one I've seen so far is on Bullits car.

fstrnldr

I don't remember seeing that, do you remember what pic it was in?


Biggest thing with a catch can on the VHR is the dual breather setup. You almost.need something custom to work well.

modme

I've been running two "home-made" catch cans since day 1 of TT upgrade. When I was installing the turbos, I noticed a layer of oil accumulating in the intake manifold. Since installing the catch cans, I've been catching ~ 2 tablespoons of oil per 1000 miles.

fstrnldr

Are you on the fresh air tubes, pcv, or both?

wstar

Seems like as good a thread as any to report on my catch can results from driving so far. My can has been on ~2,000 miles, and I dumped it last night for the first time and measured it. It collected 1/4 cup almost exactly, which matches perfectly with the "2 tbsp per 1K" modme posted above, and "1 tbsp per 500mi" someone posted in another thread.

My car is NA, so apparently FI doesn't really increase the catch can fill rate. Looks like engine oil but a little thicker and darker than mine looks when I drain it, leaves a greasy residue, and smells of fuel a little bit, which I guess makes sense considering it's condensed crankcase vapors.

Mine's running on both PCV lines. The fresh air tubes should be bringing fresh air into the crankcase, not venting gasses from the crankcase, so I don't *think* you need a catch can on those. Since we have two separate PCV lines, you'd need either a can with 4 connections, or two cans, if you want to leave everything else about the PCV system bone-stock.

As it happens the M370 manifold from Motordyne requires to you tee-adapter your 2x PCV into one vacuum connection anyways, so that made a single can setup on my car a no-brainer. Even with the stock manifold, you could tee them together, run a single can to one of the original inlets, and cap the other off. Just a matter of what you want to do with the hoses.

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XwChriswX

Can some of the guys that have done this think back and write up a DIY for those that would like to do this, but don't wanna cut/swap the wrong hoses to the wrong spots and making something simple a big problem?

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Ron

Bumping this bc I am looking into adding 2 catch cans since I am installing a TT. Based on this pic:



This is how I think they should be connected:

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Nixlimited

That's a good looking setup!

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wstar

The pic *does* look sort of like that, but it could be that the pic is deceiving, or that there are some additional one-way valves at various points in his hoses, or perhaps the setup is simply ill-conceived, I donno. Most likely the rather expensive and nice-looking setup in that pic works correctly, but I'd need more details about the components to tell you exactly how.

In any case though, your translation to two simple cans in your hose map drawing isn't going to work. The two PCV-related outlets on each valve cover are not both outbound. On each side of the engine, one is outbound from the crankcase, and one is inbound fresh air. The factory setup is that, separately on each side of the engine, one hose flows outwards from the crankcase to a manifold vacuum inlet, and the the other hose flows inwards from filtered intake air into the crankcase. At least the vacuum-connected ones have PCV valves on them, I'm not sure whether the fresh-air-connected ones have a valve buried in there somewhere (or perhaps just some foam or something).

So to run a dual-can setup, the normal way would be to splice one can into each of the vacuum<-crankcase lines. Or you could set up a single can with 4 connections the same way. Or you could do what I did and use a single can with two connections to cover with both sides, by tee-ing the pairs of vacuum and crankcase lines together (my instructions are M370-specific, but the same general idea could be done on the stock manifold): DIY - Oil Catch Can (w/ M370 + Batt Reloc).

If you want to catch oil in the fresh air side (which, tbh, I'm not really sure is worth it. It normally flows the other way, *into* the oily area, but I guess under various transitional conditions it must backflow a little), you probably would have to have a separate chamber for that, either as a combined setup or again one per side.

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Brazilbro

I'll try can to check mine tomorrow. I've had mine about 2k miles also. I'll see if I have anymore or less.

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Brazilbro

I have one

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Prosport Gauges

We offer Catch cans in Blue, Red, Silver and carbon fiber

Prosport Gauges - Search

Q8y_drifter

I'm not F.I. but i'm running a GReddy catch can. It's mounted on the driver's side between the intake pipe and radiator fan.

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JB-370z

Here is one at Baker Tuning! Top Secret Ti Catch Can. This TTed Z has two of them!

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