69K views · 889 reactions | Our DIY mobile engine stand is coming along nicely. Before we put a bow on it, Jeremy and Jimmy of Carcass give it its own Powermaster starter from Summit Racing Equipment, a Duralast starter relay from AutoZone, fuel pump, regulator, and more! | PowerNation TV | Facebook

Engines are mounted on massive test stands built to handle extreme heat, high-pressure exhaust, and volatile fuels. When fired, engineers measure thrust, fuel efficiency, combustion stability, and durability under real launch-like conditions. Different engines—liquid, solid, or hybrid—are tested in their own ways. For liquid engines, super-cold fuels like liquid hydrogen and oxygen are pumped in and ignited to produce controlled thrust. Hundreds of sensors monitor pressure, temperature, vibratio