0/2 sensors

Wondering if anyone has tried 0/2 sensors instead of EGT's, pros and cons. Thinking of trying them in our pulling tractor.



Thanks...............Kenny

 

Cons-definately the cost when you consider the initial hit (about 2k) and the fact that the alcohol tends to shorten the life of the O2 sensor, so plan on a few of them starting to not read correctly after a season or so.

Pros-for the most part, in my opinion, you don't have to interpret the info off of egt's as much. running both would be ideal, however w/ O2's you get quick info whether you're too fat or too lean instantly. This should obviously be a back up to the spark plug reading. Also everyone's egt's will be different do to location of the probe, timing, etc. W/ O2's you can get a common ground when sharing info w/ other racers. Lot more accurate comparing a/f ratios then egt's numbers. hope that helps....

Josh

 

You might check out this link.......


http://promodsource.com/forums/showthread.php?t=7042&highlight=WBEGO's


With a typical roots/screw pressurized meth motor, the A/F ratios are set intentionally rich for thermal management. 3-4:1 is typical, which is well out of the realm of standard combustion. Part of the fuel load is involved in the ensuing combustion process, and the other part is sort of along for the ride even if it does morph somewhat.

A quality WBEGO, will give you a "number". That number will be repeatable, but it will not be accurate in terms of absolute A/F ratio or Lambda value into the motor. Think of it as a reference point only. Use that number, together with EGT's and reading plugs, to track where you are at versus where you have been.

I tend to now think that determinig fuel flow and air flow into the motor, and then calculating the resultant A/F ratio (or fuel to oxygen ratio), is the way to go.