Questions tagged [thermodynamics]

The branch of physical science that deals with heat.

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2k views

Cast iron vs aluminium engine blocks

From what I can tell by reading, aluminium engine blocks are more thermally efficient than cast iron blocks - but it also seems that aluminium is more thermally conductive than iron. That seems ...
4
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1answer
466 views

Thermocouple vs Thermostat

Why don't modern engines use a thermocouple (electronic temperature sensor) instead of a (wax element) thermostat?
11
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4answers
1k views

What exactly is a catalytic converter and why does it need to operate within a certain range?

I heard here that a catalytic converter needs to operate within a certain "chemical range" otherwise it will generate unnecessary heat. What exactly is a catalytic converter? How does it work? What ...
24
votes
3answers
8k views

Why does a gas engines torque and horsepower curve always meet at 5252 RPM?

I'm watching a TV show called Tech Garage and they just made the claim that an engines torque and horsepower curves always meet at 5252 RPM. Assuming this is true, why does this happen? Is it ...
7
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1answer
3k views

Why no exhaust gas turbine generator in hybrid vehicles?

I found something interesting on Wikipedia today: a hybrid turbocharger. This is a device that charges a battery with an exhaust gas turbine, and at the same time operates an air compressor using the ...