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Cool.
So there are several solutions if it turns out temp is too
high at current location.
Also, I could move the bung further down, if I end up extending
the exhaust pipe down under the fuselage.
But the first O2 sensor in the stock manifold is pretty close to
the port, so why is that not a problem in the RX-8?
Even though I intend to use the analog output from the ALM board,
it looks I may be able to hook up a laptop and read the
temperature as well.
Finn
On 5/18/2020 5:06 PM, Charlie England ceengland7@gmail.com wrote:
Sorry; I
should have included a message with that link. I suspect that
with a little digging, a model could be located that would
allow modification to emulate what Steve's device does. Of
course, if someone (Tracy) has a metal lathe...
Charlie
Thanks Steve.
Hadn't seen that before.
Work of art!
But, dang, $89 (or $58 on eBay). Could buy a couple
new O2 sensors at that price.
Finn
On 5/18/2020 12:31 PM, Steven W. Boese SBoese@uwyo.edu wrote:
Finn,
FWIW, I've used the bung extender shown in the
photos on my test stand without ill effects other
than initial cost.
Steve Boese
◆ This message was sent from a non-UWYO
address. Please exercise caution when
clicking links or opening attachments from
external sources.
So I bought the Bosch LSU 4.9 wideband
oxygen sensor and ALM-board.
Specs for the LSU 4.9 says max operating
temperature is 930 °C (1700°F).
I recall seeing 1950F EGT temps on my 13B
with EGT probes 8" from the
side of the engine.
On the RV-4 Renesis, before buying the
wideband sensor, I welded the
bung 12" from the closest port. (Stock
manifold cut and 180° turn at
exhaust port nearest flywheel, 2.5" pipe.)
I expect the Renesis to have slightly lower
EGT temps, but am worrying
about damaging the O2 sensor.
Charlie suggests mounting the sensor on a
longer bung, moving the sensor
out of the direct gas stream, but I feel
that may reduce the accuracy of it.
My plan was to use the cheap narrowband O2
sensor initially and find the
engine settings giving highest EGTs, then
temporarily mount an EGT probe
in the O2 bung hole, run the engine at those
settings and see if EGT
there was safe for the wideband sensor.
But maybe I'm worrying about nothing.
Do any of you have data on how rapidly the
temps drop as a function of
distance from exhaust port?
Finn
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