After some recent dramas, the modding bug has struck again and I'm itching to do some working in my engine bay.

I want to give my throttle body a good clean, and when I do that, I want to install an oil catch can. I've had a look around, and I've found two kits that seem suitable. The first is from autospecialists, which at 230gbp is simply too expensive for me. However, mishimoto has a nice carbon fibre universal catch can which is sold by puma speed. I'd like to install it in my car, and get some nice yellow hoses from prohoses to replace the standard hoses it comes with.

Does anybody have any experience with catch cans? Are they a good upgrade to keep the car running nice and clean?

I currently have a Mountune intake which as you know has a pipe from the crankcase breather back to the intake piping. If I were to install a catch can, its my understanding that all I need to do is have a pipe from the crankcase breather to the catch can, then a pipe from the catch can to the intake pipework - essentially it's a stand-between the crankcase breather vent and the intake. Is this correct?

Any other advice or general comments would be welcome. Thank you.

yes your set up is correct. However from what I can tell little oily air is spent through the crankcase breather anyway, when I have had my CAIS off and filter off, the outside of the throttle body is spotless. Mountune now supply a reducer for the pipe so on full regular throttle (track days) less oily air is sucked through into the filter and inlet. Mountune cars do run lean though. Mountune run the breather back into the filter I think for environmental rules.
Maybe take your breather pipe off and see how oily it is inside, options are just a tiny filter on the end but then you will have incabin smells or proceed with a catchcan set up.

Autospecialists seem to imply that there's also a breather vent on the inlet manifold. http://www.autospecialists.co.uk/AS-Perf...duct-1101.html# "Genuine ford inlet manifold rubber blank off pipe, you blank off inlet manifold as you will not need the crank case to breathe back into the inlet manifold anymore, this is the main cause of poor breathing of engine." I'm not 100% what this means but it seems there could be a breather vent on the inlet manifold that might need to be dealt with too.

Here's the breather, marked with a number 1, it's on the back of the inlet manifold. I think air also comes from the crankcase and goes into that hole there.

I think your correct and that one probably the more important because as I mentioned Mountune do the reducer for the upper head breather pipe AND also do a reducer for the inlet crankcase as you say above.

Thank you yellowbadge for all your help so far.

I've done even more research and I think I know how the system works now. I drew an easy to understand diagram of how I plan to install my catch can. The red circled parts are t-joints.



Do you see any issues that could arise from this setup? Or do you think it would work well?

am not really a techy expert on these things but all looks good your routing.

Hi cnwerb, what's you're update on the catch can? I'm thinking of installing one as well.

I have the KN induction kit with a pipe running from the crankcase to the air filter. The thing is the filter is right above the ECU and for some reason there's oil dripping from the pipe coming from the crankcase (as far as i can figure it out), so no good - needs to be solved.

Let me know how your operation went.
Thanks!

In the above I think you'd want to get rid of the t-piece from the inlet manifold vacuum pipe to the air filter, as it will essentially be a vacuum leak and will be bypassing the throttle body. Instead you could just blank the manifold like in the autospecialists kit above. However, the PCV valve on the lower vent needs the inlet vacuum to work properly, although it might still work without it.

Personally I would just use the catch can with the cam cover vent as that is what causes the dirty throttle body.
For a boosted car it might be a different case but certainly on my car most of the oil mist comes out of the cam cover vent, and hardly any oil comes from the PCV lower vent which has a baffled oil separator before it.