O2 sensers & methonal

bike23 · Post by **bike23** » Mon Sep 27, 2004 8:13 am

Hi Don just logged on for the first time ,the site and your speedtalk discs are great we have nothing like this in the uk.
I have a question regarding the use of O2 sensers to setup an engine
running on methonel is this possible and if so what sort of reading should I
be looking for in millivolts at max power a/f ratio, this may seem basic to
you but I cant find anyone over here who knows much about methonal
and how to setup an engine using this fuel.

thanks Bill

speedtalk · Post by **speedtalk** » Mon Sep 27, 2004 10:26 am

Hi Bill thanks for the nice comment and for joining the forum. I can't help on this question, but I'm sure someone else will.

Grocerius Maximus · Post by **Grocerius Maximus** » Mon Sep 27, 2004 5:46 pm

Lambda (stoichiometric) conversions for various fuels-

gasoline- L*14.65
methanol- L*6.47
diesel- L*14.50
propane- L*15.70
ethanol- L*9.00
CNG- L*14.70

It is going to be very very difficult to get a good AFR reading on methanol with a standard narrowband O2 sensor because methanol at the 'ideal' 4.9:1-5.0:1 AFR will be ~11.2:1 on a gasoline scale, at which point the output voltage could be anywhere from say .8v to .99v depending on the sensor, and the temperature of the sensor element at the time. Cold sensor= higher voltage output for a given true AFR.

Buy borrow beg or steal a wideband for the tuning session, if it is going to be tuned on a dyno the dyno operator should have conversion tables handy.

Even then widebands can lie to you in some instances, so take it all with a grain of salt.

At the bottom of this manual is a decent conversion table you can print out for referance. http://www.fjoracing.com/PDFs/MWI0002%2 ... anual).pdf

bike23 · Post by **bike23** » Wed Sep 29, 2004 10:05 am

Thanks very much for the info I will try a widebond sensor on a dyno and see how I go

mant thanks Bill