Hi i have just fitted a 2.0 zvh i brought from a guy on here, had the engine tick over for a few seconds befor it stalls as it is sucking the boost hose in i belive as it has nowhere for the crankcase to breath.
what do i do? where/how do you let the crankcase breath and where do i put breather return to block?
i found a bung in the block but that has pressure and pumps oil out so i cant use this for breathing...
??

 

anyone?

 

Can I run the breather return to either the turbo oil return or to a union in the sump plug

 

you could use the oil filler cap - some engines have a firetrap and a crankase breather built into this

or you could make your own crancase breather - some competition engines add extra ones or enlarge existing ones anyway (this is often high up- on the rocker cover)

the crankcase should be vented - a small k&n type filter is often used (noxious fumes can get into the passenger air intake though) or a catchtank and a breather "exhaust" running to the outside of the car

with the crankcase vented to air the other (intake) end can be blocked - probably best to get someone who knows what they are doing to check it

sucking the boost hose on a turbo engine is a bad sign - it should be under pressure ("pushed out"- not "sucked in" )

 

You need to add a breather onto the back of the crankcase. I assume the breather hole on the front is blocked? 40mm core plug or similar behind the exhaust manifold?
Options are:
Re-instate the OE breather system and use a different exhaust manifold (adapted 200sx one or similar)
or, and cheapest to do
Drill a hole in the back of the block and plumb in a breather.
Ideally you want the engine to be breathing from the block and the head into a catch tank. That can either be drained back to the sump or you can empty it ( Better not returning it to the sump IMO as it'll be dirty oil and you dont want that being pumped through your expensive turbo!)
Theres loads of info on here in various build threads, of have a look on the quantums site. That gives a detailed step by step ZVH build and where he's added additional breather ports etc.
http://www.jimhearne.co.uk/zvh.htm

Good Luck!

 

thanks for the replys guys. yeah i am a little concerned about the pipe being under vacuume , im going to check i havent done somthing real stupid like leave a bit of rag in a pipe causing a blockage first thing.
yeah the o.e breather is all blocked off correctly , guess its engine back out and drill/tap the block then. hmmm