I seem to have many breathing holes in the engine.. One little box on the top: One box on the firewall where the two rocker cover breathers go and seems a third should go: One wheezer on the oil cap filler: And one mysterious one from the depths: Should all these wheeze holes be connected somehow or are they safe to vent into the engine bay? Sent from my iPhone using Tapatalk Pro
That’s a lot of holes! Mine just has the standard first one which now goes back into one of the carbs. I reckon the oil pressure in mine needs as few excuses to escape as possible! Sent from my iPhone using Tapatalk
I’ve never understood those breather boxes. Open them up and there’s bugger all in them! I’ve seen vented rocker covers before. No idea what they’re for though. I’d bin them off for stock ones.
Type 4 engines do not have a problem with their breather system so get rid of it all and feed it back to the carbs. If you don't run to the carbs then use some smoothly bent copper pipe and vent outside of the engine bay area. Can never see the point of venting inside the engine bay with a filter on it. It just covers your engine in a film of oil.
The ‘little box on the top’ is the breather box and is the only breather a type 4 needs to provide positive crankcase ventilation – once its connected to the air-filter of course. All the other stuff you have is counterproductive. The small filter ‘from the depths’ has possibly fallen off of the box on the bulkhead and may not be connected to anything.
^ what them folk said. Ditch all the breathers and box (esp the rocker cover ones) and use the breather box VW provided, attached to your air filter. Anything venting in the engine compartment will make your heating stink.
Ive got twin 34 ICTs and its a faff to plumb em in to the filter, It did have one of those filters but it was rubbish. Its been like it for yeaaaaars without a problem
I’ve got twin 40 IDFs and its hardy a faff to simply drill a hole in the air-filter for the breather hose. I agree those little filters are rubbish, anyone that understands how an engine breathes will know that putting a filter on the breather is wrong, very wrong.
Thats why I took it off, Ive had no problems with it vented like this with two vans over nearly 30 yrs
It not necessarily a problem but with passive ventilation (not connected to the airfilter) blow by isn’t removed from the crankcase so effectively and the oil becomes contaminated quicker. It also means that oil fumes are pumped directly into the atmosphere instead of being burnt. 30 years of fumes is not to be sniffed at.
I've got my newly built type 4 2l engine back now with twin 40s. Should I vent the crank case into one air filter and the fuel tank into the other? Or should I T-piece both and vent into both filters? Sorry if I'm hijacking this thread.
Ideally use those brackets with a metal pipe that fit on the outside of a pancake filter so that fumes actually pass through the filter, drilling the top and putting a barbed fitting on is ok but you’re not actually filtering anything just sucking it straight down the carb!
