Thermal Imaging for engine tuning and troubleshooting

[silver69camaro]

4) Narrow band O2 sensors on each cylinder would be the best way to balance an engine where you can trim timing and fuel curves for each cylinder.

Why narrow band sensors? Or do you mean wide band?

[John S]

Why narrow band sensors? Or do you mean wide band?

I mean Narrow band when tuning if you can adjust fuel and timing such as in a Sequential fire MPFI system. The sensors would only be installed during the tuning process then removed for normal engine operation. The use of a permanment Wide band sensor would still be required for normal engine operation.

By using the O2 sensors while tuning you can monitor cylinder A/F ratios and adjust to achieve as close to Stoich as possible. Once set a baseline thermal image could be obtained and any future changes could be analyzed by taking another thermal image and comparing it to the baseline.

The use of the thermal camera during the tuning process would also enable you to trend EGT changes during adjustments and this way you would know what adjustments to make (Richen/lean) to obtain Stoich during tuning based on EGT alone.

Once again, the use of these NB O2 sensors would not pre-empt the need of a permanment WB sensor for normal engine operation.