Jeff Spitzer wrote:

At 10:11 AM 2/19/99 -0800, you wrote:

Mark Steitle wrote:

I have been reading with interest all the chat about exhaust
temperatures.  I have included a picture of the Mazdatrix drag car
rotary on the dyno.  The exhaust headers are 1/8 steel (no, I'm not
advocating that for a/c) and they are measuring 1600 degrees downstream
at the flanges.  The pipes nearer the engine are obviously much hotter
as they are glowing red.

The caption for the picture states "Everyone hears about how hot the
rotary runs - here can see it. This was a mild power pass. Those headers
are 1/8" thick steel, and are bright red THROUGH Jet-Hot 2000 degree
coating.

The EGT probes are at the end of the headers, right before the flanges.
Exhaust temps were 1600 degrees at the probes."

Just wanted to forward the jpg so that we can all see just what we are
dealing with here. A failure in flight could ruin your whole day.
Keep up the good work...
Mark

Childs play!  On the Moller rotary we had EGTs of up to 2100 deg.  The
exhaust system would glow bright orange all the way to the end which was a
5" supertrapp with like 30 discs.  That sucker shot a ring of blue flame
out of every disc slot all the way until the flames impacted a 10" diameter
1/4" wall collection bell that exhausted out of the dyno cell.  The bell
was welded to an 8" dia. 1/4" wall tube that ran up along the ceiling to
the exhaust fan suction side.  It would draw in plenty of cool air in the
bell to mix with the exhaust.  That sucker would glow dull red for 5 feet
down from the bell even with secondary air flow.  The heat in the cell was
so intense that the light fixtures began to drip!  The .035 stainless pipes
got so hot near the ports that they had no color at all and appeared to be
translucent.  I've since had others tell me they have experienced the same
perception when looking at pipes *that hot*.  Needless to say our BSFC's
were not the greatest at this operating point.

Jeff Spitzer

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