K&N Air / Fuel Ratio Monitors



K&N Air-Fuel Ratio Monitor Gauges, Round and Square Version

     The K&N Air/Fuel Monitor is a precision instrument designed to help performance enthusiasts calibrate an optimum air/fuel mixture ratio. This device will work on carbureted, injected, supercharged or turbocharged engines using unleaded gasonline, alcohol, propane or nitrous oxide. It will not work with nitromethane or diesel fuels. Using the instrument to monitor the engine's air/fuel mixture ratio, a tuner can adjust for power, economy and/or improved drivability.
     The monitor reads oxygen left in the exhaust regardless of what fuel is used, so the number of lights and the corresponding scale remains the same. Monitors have red, yellow, and green lights that require 100 millivolts per light for a total of 1.0 volt.
     Note that while these relatively inexpensive air/fuel gauges can be quite handy for giving you a general feel for the air/fuel ratio in your engine, they are no substitute for a wideband air/fuel ratio meter when you are doing performance tuning. Although wideband AFR's are more expensive, they provide an accuracy of finer than 0.1 AFR. For that purpose we recommend the FJO Wideband Air-Fuel Ratio System.

 
ECONOMY
BEST ALL-AROUND
POWER
Gasoline 17.1 16.0 15.1 14.7 14.7 14.7 14.7 14.0 13.2 12.1
Alcohol 7.6 7.1 6.7 6.5 6.5 6.5 6.5 6.1 5.8 5.3
Propane 17.9 16.8 15.9 15.6 15.6 15.6 15.6 15.0 14.0 13.0


Part # Description Price
85-2441 Round "in-dash" kit
(includes monitor, sensor, and weld on fittings)		 $210.11 kit
85-2437 Rectangular "surface mount" kit
(includes monitor, sensor, surface mount bracket, and weld on fittings)		 $190.91 kit
85-2440 K&N O2 Sensor Weld-In Bung and Plug $24.01 ea

*** NOTICE ***
     The oxygen sensor in the K&N Air/Fuel Monitor assembly is not compatible with leaded fuels or any fuel additive containing lead. Leaded fuel will contaminate the oxygen sensor causing it to deliver a false reading. The monitor can, however, be used to momentarily test an engine burning leaded fuel. Short term exposure will extend the useful life of the sensor, but eventually it will become contaminated. Once contaminated, the sensor must be replaced to restore the accuracy of your instrument. Additionally, since there is no efficient way to test the sensor, there is no way to determine the level of contamination. Therefore, K&N recommends periodically compaing a used sensor to a new one. Products that will contaminate the sensor are: gas/oil mixture, injector or carburetor cleaners containing lead additives, octane boosters containing lead, and other "secret potions".


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