DIY Prony Dyno Correctly Shows Energy Manufacturing



When hackers within the US consider a retailer known as Harbor Freight, we often consider low-cost instruments, workable however horrible DVM’s, zip ties, and tarps. [Jimbo] over at [Robot Cantina] seemed on the 212cc “Predator” engine that they promote and thought “I guess I might energy my Honda Perception with that.” And he did, efficiently! How a lot energy did the closely modified engine make? Within the video under the break, [Jimbo] takes us via the method of measuring its output utilizing a house constructed dyno.

The dyno that [Jimbo] has constructed is a Prony Dyno, and it’s among the many oldest and easiest designs obtainable. A torque arm is prolonged from a disk brake caliper and connects to a pressure gauge. The engine is ran as much as its highest pace, after which he brake is utilized to the crankshaft till the engine nearly stalls. A tachometer hold monitor of the RPM, and the pressure gauge measures the pressure on the torque arm. Torque is multiplied by RPM and the result’s divided by a relentless of 5252, and voilà: Horsepower. A pc plots the outcomes throughout the complete vary, and the dyno check is full.

That solely tells a part of the story, and the actual hack comes once you notice that the dyno stand, the pressure gauge setup and just about all the things that may be constructed at house has been constructed at house. You’ll additionally get pleasure from seeing the outcomes of some driving checks between the 212cc engine and its greater 420cc brother, how even minor modifications to the engine have an effect on the horsepower and torque curves, and the way that impacts the Honda that he calls his “Avenue authorized go cart.”

Talking of bizarre energy vegetation, how about plant some pastime sized jet generators on the again of your Tesla for enjoyable?