I switched #1 & #2 egt probes,,there is a calibration error, not a lean cylinder,,good,,but,,,,
Stupid bloody O2 sensors,the ears say filthy rich, the gauge disagrees , then
goes out on strike (again),,,,,,,,,,,,,,,,,,After further research regarding
wideband O2 sensors, Iv'e reached the conclusion they suck when using methanol,
there are SO many variables affecting their operation like unburnt fuel giving a
false lean reading , missfires giving a false lean reading, thermal shock from
the H2O produced when burning methanol kills the ceramic heater element, they
can't be switched off while warming the engine enough to evaporate any H2O
droplets in the exhaust, this will foul the element also.
The makers neglect to mention the Innovate Motorsports Digital MTX-L Air/Fuel
Ratio Gauge will suffer these problems in the sales pitch, although the problem
is mentioned in "help"
" Wideband O2 Sensor is compatible with all fuel types (Leaded, Unleaded, Diesel,
Methanol, E85, etc)
• Ability to calibrate O2 sensor for increased accuracy "
"When tuning a methanol engine, make sure the engine is warmed up before you
switch on the wideband system. (The short operation without heater power will not
damage the sensor.) Here's the reason:
Many methanol engines run very rich, not only because of the low stoich AFR of
methanol (6.4), but also because methanol has a very high latent heat value
compared to gasoline. On a cold engine only part of the inducted or injected
methanol even vaporizes and takes part in the combustion. The rest runs out of
the exh. ports still in liquid droplet form. This can be seen on the exhaust
ports that show traces of liquid methanol running out. This liquid methanol can
kill the sensor by heat shock (high latent heat, as said), just as water can.
In addition the EGTs of methanol are typically much lower than on a gasoline
engine, while the exhaust gas volume is higher. This causes the sensor heater to
not be able to keep the sensor at operating temperature and it will error out.
Even higher supply voltage will not help because the sensor heater has a limit to
how much wattage can be supplied to it. After all, these sensors are designed for
production cars with much lower power than a methanol fueled dragster. Using a
double height bung so the sensor is out of the direct exhaust stream will help
the sensor heater to keep the sensor in its operating temperature range."
Back to "feel" ,sound, & plug reading I guess (your right Ronnie,OLD SCHOOL RULES !)
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering