oil in air cleaner

[Gunslinger]

Hi all
I have been having a problem starting the van. It has been getting progressively worse to start but once started it runs fine. I checked all the usual suspects then removed the air filter only to find a fairly large amount of oil that had obviously been pushed up from the crank breather. After cleaning all this out, cleaning the carbs and replacing the air filter it seems to run ok now but I was wanting to know what has caused this and what could be wrong as I assume it will continue to happen unless I get it sorted.

I'm running a 2.0 air cooled system on a 2.4 a/c engine, not sure if the extra power is a factor but thought I would mention it.

Thanks in advance for you help
Stuart

[toomanytoys]

Its crankcase pressure blowing the oil vapour out..
Depending on how old the engine is (and I am guessing it isnt that old and its an engine shed "big bore") a little oil in the intake is expected.
Crankcase pressure comes from piston ring blow by, some gasses escape from the combustion chamber depending on ring wear, hence old tired engines "breath" heavily and use oil...

[Gunslinger]

Its crankcase pressure blowing the oil vapour out..
Depending on how old the engine is (and I am guessing it isnt that old and its an engine shed "big bore") a little oil in the intake is expected.
Crankcase pressure comes from piston ring blow by, some gasses escape from the combustion chamber depending on ring wear, hence old tired engines "breath" heavily and use oil...

Thanks for that. Yes it is a TES big bore having covered around 5k. So are you saying its nothing to worry about? I'm having Dellorto's fitted soon (if I can find someone to fit and tune them) and that would mean having a seperate crank breather which would obviously eliminate the oil in the air cleaner problem