The dynamometer outputs a chart that looks like this. On it, two lines are plotted: a line for torque and another for horsepower. Peak torque is where the engine produced the most force.

But when you build a Stirling engine, and you’re of a quantitative bent, having some way to measure its power output would be handy. That’s a job for a dynamometer, which [Leo] sets out to ...

The Heavy-Duty Chassis Dynamometer Emissions Laboratory is capable of handling vehicles ranging from pickup trucks to Class 8 trucks, buses and other heavy-duty vehicles, single or tandem axle ...