Use engine block heater to warm Catalyc converter ?
 

Would the Cat warm up faster if an engine block heater could be modified for it ?
Why not ?

Cd -

I think it's a good idea but I also think the "scale" of temperatures is too wide. A Cat gets a lot hotter than a block heater.

But I could be totally wrong.

CarloSW2

Engine block heaters weren't designed to operate in free air, but immersed in coolant inside the engine block.

That being said, a properly installed block heater would still fire off your cat sooner. After all, waste heat energy is being shoved out the exhaust, that would have otherwise gone to heat up the engine block. How much sooner?... Eh. Tempted to say that you'd shave a few seconds off the cat's warm-up time.

Right. I realize this, but I was thinking keeping the Cat partly warm versus frozen ( Canada eh ! ) might be beneficial .

Thank you ! I did not know that engine block heaters were immersed in coolant - but then since I live in scorching hot Texas, I had never seen one.
( In fact, on my first trip to Canada I saw all these cars with electrical wires hanging out the grilles and thought " Damn ! These Canadians have really got it together ! So many EVs ! :D )

How long does it take for the cat to light off?

Heating it wouldn't save any fuel... just cut emissions for a minute or so. The heated O2 sensor is what helps fe and emissions the most.

Cd -

I think there are different kinds. The kind that is immersed in the coolant is definitely the best kind.

CarloSW2

Frankly, Frank, the emissions are the reason for doing something like thiis.

C'mon its Earth Day :thumbup:

So we need a heater for the O2 sensor eh ?

Most 4 wire o2 sensors are heated, as far as I know the only non heated o2 sensor is the single wire o2 sensor.