Turbo sides - wet and dry?

[hethers]

Hi all

Sorry about the ignorance but I'm bugged by a finding under the car; under the near side charge air cooler there is a thick rubber hose connected to the lower header by a clip. Now on mine this is damp with oil at the 'cut' end of the hose, obviously where oil has been pooling under gravity for some time within the hose.

I believe this is the compression side of the turbo and goes directly to the cylinders from this point - my question is, is this ok to have oil in this bit? And how much is ok? And is it the exhaust/turbine side that should remain dry?

More importantly does it need looking at???

Thanks in advance

Chris

[MarkB]

There is normally oil in the intake pipes. Too much and you need to start worrying. Too much is defined by a James Bond smoke screen when driving

[Chubby]

Too much and you need to start worrying. Too much is defined by a James Bond smoke screen when driving

Like that - like it alot....

R.

[Crunchster]

Oil in the intercooler pipes is common, and results from the crankcase breathers venting to the turbo inlet. You need to vent the crankcase to prevent pressurisation and to extract blow by gases and water vapour that if left in the crankcase would cause corrosion.

Unfortunately the blow by gases dilute your charge, as well as reducing the effective octane of your fuel. Oil mist has a similar effect and coats the inside of your intercooler core reducing its cooling efficiency.

My advice would to be to vent your crank and cam breathers into an oil catch can which vents to atmosphere. This will remove the oil contamination and allow more aggressive ignition tuning. Win all round

Neither your compressor or turbine should ever be covered in oil This means your turbo oils seals have gone and a hefty bill will be on its way....

Si

[lengster1]

Welcome Crunchster nice first post you know your stuff