<VV> turbocharger cooling

[jvhroberts at aol.com]

 Yep. And as one who has put a TO4B on an RX7 engine in his boat, I did replace my center housing with a water cooled one. Two main reasons:

1. Rotaries have significantly higher EGTs than piston engines.

2. Marine engines run for prolonged periods under heavy to full load. 



When I swapped the housings, the water cooled one and the plain one looked identical, except for a small water passage around the bearing toward the turbine side. 

In retrospect, I probably didn't need it, given that there's considerable idling before pulling up to the dock, and the exhaust manifold and turbine housing were sea water cooled. 

However, when I first did this, I didn't have a water cooled turbine housing. When it's glowing orange hot and CLEARLY visible on the noon day summer sun, it was clear I needed to jacket the thing, especially considering that the boat hull is wood and fiberglass! Can you say fire? Never had one, had heat shielding, but that's NOT what one wants to have in the bilge of a boat!





 





 



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

From: HallGrenn at aol.com

To: JVHRoberts at aol.com; FrankCB at aol.com; shortle556 at earthlink.net; fparker at umich.edu

Cc: virtualvairs at corvair.org

Sent: Wed, 27 May 2009 10:08 am

Subject: Re: <VV> turbocharger cooling













 

In a message dated 5/27/2009 9:05:06 A.M. Eastern Daylight Time,  

jvhroberts at aol.com writes:



Bottom  line, water cooling of a water cooled turbo should not be necessary 

if one  
idles the thing before shutdown. 









Anecdotal evidence in support of this statement; a co-worker is very proud  

of the fact that her Saab turbo still has the original, working turbo at 

224,000  miles.  She takes pride in idling her "baby" for at least a couple of 

 minutes before she shuts it down.  She is also fastidious (in everything)  

about oil changes and cooling system maintenance.  The turbo still puts out 

 boost and she still drives it "quickly" after 12 years.

 

Bob Hall

Group Corvair

**************We found the real ‘Hotel California’ and the ‘Seinfeld’ 

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