quote:How close do you think I can mount the O2 to the head? I have completely different type of headers with all 4 primaries going to the back. The primaries land in a common muffler far down the line.
I am afraid if I put it in the muffler section it will be too far away and not heat up adequately. Since they need to be mounted at least partially upward, this limits my location to the top of the runners here. My concern is that the O2 sensor does not get too hot:
I have O2 sensors as close as 5 inches to the heads and they work fine there. I also have an O2 sensor mounted right before the muffler. It also works fine there. Since most O2 sensors have a heating element built into them I do not think mounting them far down the line would be a problem. However, if they are being used to control engine management (as opposed to just a air/fuel ratio gauge), I was told they need to be as close to the engine as practical...