[JohnnyTSi]

Given how these O2 sensors are so expensive, I wanted to add a heat sink. I discovered there aren't many options available for purchase, so I came up with this idea:

2x Copper tumblers from Amazon - https://www.amazon.com/dp/B08L68N3DB?psc=1&ref=ppx_yo2ov_dt_b_product_details

15 mins of elbow grease to trim them and drill 3/4" holes with my step-drill:

 

[gtrbillet]

Copper is an interesting choice. With such high thermal conductivity, won't it soak up all the exhaust heat and then cook the sensor like the copper pots and pans they sell on TV? Just wondering......

 

[BMR_GTR]

I'm only stabbing in the dark here but wont that actually limit the airflow around the sensor and cause the opposite effect you are looking for?

 

[JohnnyTSi]

The OEM sensor does have a similar heat sink (though not copper):

On other platforms, I've used a piece of copper sheet like the below for a heat sink solving a dead wideband O2 sensor (AEM EUGO) every few months.

I do wonder how effective these supposed heat sinks are, now I'm thinking about how I could test!

 

[gtrbillet]

Not to get into semantics, but I’d call this a heat shield versus a heat sink.

The oem shield is steel which has relatively low thermal conductivity. Isn’t it only on one side as well? I wonder what drove Nissan to install that on the one side. They wouldn’t have spent the money If they didn’t think they needed it. Though all of us with aftermarket downpipes don’t have it anymore. Yet without cats in the dp, maybe don’t need the shield….etc etc…

 

[JohnnyTSi]

I've had 2 cars with aftermarket wideband systems that routinely killed their sensors, in both cases the (different) company's support blamed too much heat as the culprit! Once a heat sink was added, the failures seem to stop.

Several manufacturers make products advertised as heat sinks to draw heat away from the sensor, supposedly keeping it cooler.

Innovate Motorsports HBX-1 Heat Sink Bung Extender - 37290

The Innovate Motorsports HBX-1 Heatsink Bung Extender will direct some of the heat away from the sensor drastically reducing the likelyhood of the o2 sensor overheating.

www.diyautotune.com

604-00100-9000-SS304 O2 Sensor Bung with Built in Heat Sink

www.stainlessbros.com

 

[gtrbillet]

Interesting. Good info.