<VV> turbocharger

jvhroberts at aol.com jvhroberts at aol.com
Mon May 25 12:46:17 EDT 2009


 Ball bearing turbos also have oil feed and drain lines. There's no other way to keep them cool enough. And during operation, oil is THE primary coolant. However, should you decide to make yours wet, do consider the thermosiphon option. 


-----Original Message-----

From: Frank F Parker <fparker at umich.edu>

To: jvhroberts at aol.com

Cc: virtualvairs at corvair.org

Sent: Mon, 25 May 2009 12:33 pm

Subject: Re: <VV> turbocharger

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




> 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!?


> 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!?


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?





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