O2 sensor distance from shorty header...

[nvrstuk]

What is the optimal distance for the O2 sensors from the end of a shorty header? Redoing my headers, O2 sensors and exhaust...

 

[pcf_mark]

Close as you can get. They need to be hot to work best.

Be sure to mount it sideways not on the bottom. With the end angled down. This keeps water from collecting damaging the sensor and / or rusting the threads.

 

[nvrstuk]

I was planning for the two sensors to have them within 6" or ... Garry said to double check with the manufacturer for the distance for the data-logging one...

Thanks!!

If you notice there's no three bolt flange collector there because I needed to eliminate it and move it for clearance for the Dana 60 yoke

 

[sykanr0ng]

Close yes, but if too close to the collector the gasses from the individual tubes have not mixed yet (which is why not in the collector either).

People on other forums have suggested 4 inches is enough to allow the mixing.

And definitely no lower than 3 o-clock or 9 o-clock on the tube, condensation ruins them quickly.

 

[nvrstuk]

Generally narrow band are mounted closer to the engine.

I checked the manufacturer of my wide band sensor and it said at least 18" for longer life... up to 40".

 

[rguest3]

nvrstuk - 18-40" beyond the collector?