Exhaust gas temp measurement

[Bruce]

Double Bubble?.
Zagoto.
Bruce

----- Original Message -----
From: "Rudi M. Machilek" <rmachilek at nc.rr.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, October 25, 2001 9:39 PM
Subject: RE: Exhaust gas temp measurement


> Agreed on the material selection.  The vibration problem I have
experienced
> on a range of applications was on the cold side sticking out from the
> exhaust manifold.  We were snapping-off lead wires, had connectors coming
> apart and such.  An aluminum bracket to tie that end down took care of the
> problem.  When we tried smaller 1/16" sheath thermocouples (trying for
> response times we never got), a week or two was all we got with Inconnel.
> We would loose the element just at the base of the fitting in the exhaust
> manifold.  We attributed it to resonance from the near sonic port flow and
> mechanical vibration.  The Abarth 850 was the worst, but it seemed to
> vibrate badly anyway, so that example my not be fair. The 3/16" diameter
> elements did not exhibit this problem.
>
> Rudi
>
> >Either a 321 SS, 347 SS, or Inconel sheath will not only stand up to the
> heat better, but will not be >nearly as likely to crack from the
vibration.
> Cracking (due to intergranular corrosion) _IS_ the failure
> >mode of 304 SS at high temps. The vibration is not that much of a
problem,
> even at high temps, with >the correct alloy.


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