This does not mean that turbo cooling is not necessary. The oil does a lot of cooling for the bearings, but if the bearing housing is built with a water jacket, it SHOULD be used. Especially with a twin turbo setup, since you just have a T in the oil feed line, one turbo could potentially be starved of oil. You need to have separate coolant passages otherwise you're heating up the second turbo in line instead of cooling it. The turbine housings and bearing housings are meant to withstand that kind of temperature. A normally NA engine might not have been designed to withstand that temp. I'm not saying this is the root of the cause for a cracked head, but you will definitely destroy your bearings in your second turbo over time.
As to the actual head cracking, have you done a coolant flush and/or inspection of the coolant passages to look for blockages? Hot spots can cause more thermal expansion and cracking. just an idea.
good luck
As to the actual head cracking, have you done a coolant flush and/or inspection of the coolant passages to look for blockages? Hot spots can cause more thermal expansion and cracking. just an idea.
good luck
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