been having blue smoke on overrun lately, thought it was the valve stem oil seals, but had a look inside my plennum and its got some oil in the bottom

 

pcv's i hear you all say, well they were replaced bout 500 miles ago, new hoses too,

 

am i right in saying its not the valve stem oils seals as there would be no oil in the plennum if it was the valves as the oil would leak straight from the valves to the cylinders!!

 

SO WHAT ELSE COULD THIS BE?? :headvswal

 

i have been told by a mechanic who used to work on rally cars that if the engine is breathing too heavy I.E the air filters are too efficient that it can cause some oil too be drawn into the breathers system!! is this correct???

 

any help greatly appreceated.

ok so this is the se-nissan maxiflow kit complete with the shitty paper filters having said that i didnt get oil in the plennum from using these!! :headvswal

 

and the other attachment is with the awsome k&n filters which sound great and preform really well, :dance:

 

but using these i seem to get oil in the plennum, i looked inside the intake pipes that go behind the headlamps & the drivers side had some oil in it, so i stuffed a rag down the pipe and was quite a bit of oil in there!!

 

has anyone come across this before??

 

would a catch can be a better bet fir me??

 

cheers

No idea why. but my mechanic mentioned that he was realy supprised my plenum was dry?

 

i never asked why, but apparently the race cars he crews for have oil in the plenums?

 

i never asked why

if you havent got oil in your plenum id say your engines very efficient!!!

 

fastredz, do a compression leak test [warm up engine and squeese 175 psi into each cylinder on its compo stroke] take off the oil fill cap and if the air comes through there you know youve may have :blow by:or it could be the oil your using what oil are you using????? if its to thin this could cause this aswell

 

cheers

 

mot

ok ill give that a try, ive got commpressed air bottles in work 200bar hope i dont blow the head off :nelson:

If your turbos are worn they do allow oil into the plenum via the coolers, hence oil in the pipe. Oil leaks past the bearings behind the compressor and into the airways.

forgot to mention brand new turbos bout 3 months ago less than 500 miles on them!! they might be still bedding in???? :confused:

I dont think they need "bedding in". There is a chance one is faulty I guess? A blocked air filter can cause this but K&N would be OK if clean, and why just one? Unless one tub is below par? Turbo oil return? If this was part blocked the oil feeding the turbo (under pressure) would want to go somewhere, and could cause this. Running out of ideas.