[Biturbos4] S4 Biturbo newbie

Grant gfl1 at optonline.net
Wed Dec 22 20:56:39 EST 2004

Just to be clear - while we all have favourite ways to achieve cooling, 
there is no debate about the basic issue:  heat soak cooks oil, and 
cooked oil shortens the life of turbos, in several ways.  So, absent 
instrumentation to show us all exactly what is happening (like the heat 
sensors someone cleverly suggested), we make our best guesses about 
what is satisfactory, and trade-off convenience for perfect cooling.

As noted, I do exactly what you do. I just want anyone reading to 
understand that heat is the enemy, and flowing oil is the main thing 
controlling heat at the bearing surface.  Even all the water cooling in 
the world just keeps the casing temperature down, so that it can be a 
better heat sink.

On Dec 22, 2004, at 9:42 AM, northrup wrote:

> there is quite a debate about turbo cooling... essentially what i do 
> is to
> stay off the boost as i near my destination, thus letting the oil and
> coolant do their job of cooling down the engine and turbo parts.
> Following this, and depending on the situation, I may idle for 30-120
> seconds... or not.

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