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Date: Sun, 20 May 2007 10:34:08 -0400
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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: more turbo questions

Not to mention that there is a thermal boundary layer which keeps the  
plumbing around 3-400dF cooler than the gases inside.

Walter


On May 18, 2007, at 3:56 PM, marv@lancair.net wrote:

Posted for "Colyn Case on earthlink" <colyncase@earthlink.net>:

additional question: what is the temp drop across the turbo?
e.g. if the tit is 1750 what temp is the exhaust pipe seeing (in  
other words
if it's stainless will it melt?)

[It would be easy enough to install an additional EGT probe in the  
exhaust stack and measure that number directly.  A temproarily  
installed free standing EGT gauge could provide the readout.  I guess  
it all depends on how important it is to you to learn what that  
temperature differential is.  All things considered, though, the  
exhaust headers leading up to the turbo from the cylinders are also  
stainless, and if they're not melting it seems pretty obvious that  
the final exhaust pipe (which we know is seeing a lower temp)  
probably won't be melting either.  BTW, the melting point of 316  
stainless is something like 2550F or 1375-1400C.... you've got a long  
way to go from your 1750F TIT.    <marv>        ]


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