<VV> turbocharger

[Frank F Parker]

On Mon, 25 May 2009, jvhroberts at aol.com wrote:

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> You really don't need it, however, if you REALLY feel a need to cool the thing, keep it simple. Get a short section of finned hydronic baseboard radiator, and simply mount it vertically near the turbo, and fill 'er up! Let convection do the work. Have a small expansion tank on top, and forget about it!
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> The purpose of water cooling is to protect the bearings against coking when the oil flow stops. On every water cooled turbo engine I've come across (and I've owned a few), the only circulation after shutdown is via convection. Heck, you could simply use a coil of copper tubing! The amount of heat you need to dump, either way, is small. The goal is to keep the temps from cooking the oil. And that just doesn't take all that much!
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Good idea BUT it is based on the ASSUMPTION that the only time you need 
the water for cooling is when you stop to prevent coking.
That assumption is not true. Not much cooling to center section from oil 
since it has ball bearings. The oil line to turbo has a very small 
restriction because the turbo needs little oil which also helps the
drainage. Water is highly suggested by Garrett for the turbo I am using.
You may choose otherwise. For myself and the turbo I am using, I want the
ability to run it as hard as I wish and not worry about cooking the center
section during DRIVING, not just at shutdown

frank