It's hard to say.

I think it would vent to atmosphere maybe with a small filter on it.

I would assume with a mechanical injection setup like that (race car) it wouldn't be very high on their list of priorities to address the output of the crankcase fumes (environmentally speaking). I think they would just plumb it to ensure that at no point will it purge oil onto the track. So i reckon it'd attach to a vent or even a third catch can.

Someone said they plumbed the catch can contents back into the sump. You have to be mindful of moisture content returning into the oil. I'm not sure how they rid the catch can contents of moisture before the oil goes back into the sump.

just one more question! does the hose pointed to in the picture just hang? or is that connected to something aswell?

cheers

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thanks casey a picture speaks 1000 words!

example of plumbing them both into a breather... the only thing i can think of that might be a problem is depending on how old and worn your motor is wont the crank case vent spit sludgy gunk out of it ? a build up couldnt be good probably vent it lower than the outlet ?

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thanks for all that guys!

clyons8-i think my air filters are very similar or exactly the same to the ones in that link so might try to get it sorted that way for inspection and see where it goes from there. Once i get it connected up ill take some pics too double check

ddgonzal-thanks for the simplification! I think i have my head around it

To be clear, there are TWO things here:
* Air inlet breather for the block
* Fume outlet for the block

You can use either block breather tap:
* Top (in rocker cover)
* Bottom (pipe on engine)

The A12 engine and A12GX reverses the PCV flow, so you too can do it whichever way you want.

1. Connect one to the air cleaner (Carburetor inlet)
2. Connect the other to the PCV valve. The PCV valve connects to the inlet manifold.

Redline offer a filter assembly that will accommodate a feed from both crankcase fumes and rocker fumes.

These are very poor flowing filters but from all the people I know (who run twins) they pass inspection even though you can regard them as an exposed filter element.

Your next option is to plumb the crankcase fumes and rocker fumes into a plenum or airbox that connects to a separate air-filter.

It's a hard one to pick but if you go for air-filter socks and small filters on the vent lines you will most likely get done for 1; not adequately dealing with the crankcase and rocker cover fumes but 2; having exposed air filter elements.

Once they see the fumes getting redirected back into the induction system they tend to rest a little easier even if you are running the exposed box filter elements.

Your other option is to fit a PCV valve to the inlet runners (which shares all of the four vacuum signals) to take the feed from both crank and rocker cover. Fitting a PCV valve to one single inlet runner and plumbing the feed into this may pass the inspection but it won't work or perform properly.

Hope this makes sense

haha great eye!

im running twin dellorto sidies with air filters as seen in the pictures below, air filters not on yet.

further advice?

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So it is an A14, not a bad eye eh?


There is no legal alternative apart from plumbing it back through the induction.

Most people pass the engine as suited to the guidelines and then modify or refit their add-ons later(once they've passed the inspection).

If you are running a downdraft weber most aftermarket air cleaner assemblies will accommodate a PCV return/feed, yet the assemblies are an exposed air-filter element that could also be picked up as a breach.

Tell us a bit more about what setup you are running and we can offer better advice?

With sidies you can plumb the whole lot in back through an induction plenum or air box.

Use a manifold that has provision for the PCV valve.
Some twin sidey manifolds do, most don't...