Venting catch tank - where to/what size/filter or not?
#1
Scooby Regular
Thread Starter
Venting catch tank - where to/what size/filter or not?
OK, I can't find a definitive answer to this so here goes. I need to know about venting my oil catch tank. The questions are:
- How far down the transmission tunnel should I run the venting pipe? All the way to the back axle area? Or will just the end of the gearbox do? Any problems with fumes entering the cabin if I only go half way down the transmission tunnel?
- Will my 1/2" hose, 2 to 4m long be sufficient to vent fully when it needs to? If I'm running the breathers through a catch tank there will be an issue with 'breathability' presumably. Looking at the RCM catch tank it looks like the vent pipe is at least 3/4" compared to the three 1/2" breather hoses. In fact every properly made catch tank I've seen always has a larger vent pipe.
- Does the vent pipe from the catch tank need a breather filter on the end of it? After a lot of thinking about it, I've decided it will never be needing to breathe in, therefore I could just get rid of the filter, on the grounds of it being a further restriction and a magnet for oil, road crud and possibly blocking completely which would make the whole exercise pointless anyway.
#2
Scooby Regular
iTrader: (10)
hi, i have got a 22mm breather pipe, and it has no filter on. it goes down to where the downpipe and gear box are.
i think it would be best for it to go past the geat box, as i get a few smells from time to time, and i think it is coming in where the gear stick is in the floor pan, so i would say to have it go past the gear box.
shouldnt think you would have any probs with it getting blocked with crud
i think it would be best for it to go past the geat box, as i get a few smells from time to time, and i think it is coming in where the gear stick is in the floor pan, so i would say to have it go past the gear box.
shouldnt think you would have any probs with it getting blocked with crud
#3
Scooby Regular
Thread Starter
22mm that's a monster pipe! Very useful to know you get a smell coming up, I was thinking of leaving it around the middle of the gearbox, but you've persuaded me not to run it that short. I might just use a Y adapter off the catch tank and run a pair of 1/2" hoses down to the same place.
#5
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Thread Starter
Nice. At the moment I'm using the standard tee pipe from the rockers under the manifold and just bringing a single 1/2" pipe off from this to the tank. I have been thinking about whether to just take the rockers up to the tank individually, like yours. So three separate 1/2" inputs, one big bore vent or perhaps a pair of 1/2" vent pipes.
#6
Scooby Regular
iTrader: (10)
i had my rockers T together, and found it collected scum/creamy/watery stuff in there, and it was abit of a blocking point, not to the point that it became compleatly blocked, but more than i would of wanted.
so went for the set up that i have now.
the idea of a bigger bore vent pipe to under the car, is that you have got 3 breathers going into your catch can, so you will need a big pipe to get the same amount of gas out.
so went for the set up that i have now.
the idea of a bigger bore vent pipe to under the car, is that you have got 3 breathers going into your catch can, so you will need a big pipe to get the same amount of gas out.
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