When turbing my N/A Engine I did away with the oil injectors and have been running premix gas. My question is whether or not running (90-100):1 premix will mess up the O2 readings on a wideband. Thanks for any input.

 

It will have no ill effect.

 

Not sure what sensor you have, but FWIW, these things seem pretty robust these days and are designed to be accurate is some nasty environments.

From the Bosch pdf...

Applications

Combustion processes
– Oil burners
– Gas burners
– Coal-fired systems
– Wood-fired systems
– Bio refuse and waste
– Industrial furnaces

Engine-management systems
– Lean-burn engines
– Gas engines
– Block-type thermal power stations

Industrial processes
– Packaging machinery and installations
– Process engineering
– Drying plants
– Hardening furnaces
– Metallurgy (steel melting)
– Chemical industry (glass melting)

Measuring and analysis processes
– Smoke measurement
– Gas analysis
– Determining the Wobb index

Base ceramic probe of Zirconium and Yttrium
-Forms a tough base that resists cracking from mechanical and thermal shock

Patented Platinum Power Grid
-For optimized sensing, delivering best-in-class performance and maximum service life

Fine particle filter
-Prevents contamination of the electrode for longer service life

Coarse particle filter
-Protects against exhaust gas and other chemical contamination, increasing sensor performance life

Engine oil consumption at a rate greater than 1 quart per 1,000 miles will shorten sensor life.

 

Assuming 2-cycle oil is as bad for sensors as engine oil (probably a bad assumption):

1qt = 128oz.

Most of us mix at ~1oz/1gal, but I'll assume 100:1 ratio, which should work out to 100gal of fuel per quart of 2-cycle.

If you get more than 10mpg, you're fine. :-) If not, you might shorten the sensor life a bit, but I strongly suspect an oil that's designed to be burned won't bother the O2 sensor nearly as much as engine oil.

-=Russ=-

 

1 gallon = 128 fluid oz

128:1 means

128 parts fuel to 1 part oil

meaning 1 gal of fuel to 1 oz of oil

 

The sensor will be fine. I've been running a PLX wideband with the Bosch sensor for 3 years and it still reads perfectly.