Why 5252 horsepower

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Car Tech Features View All. You take your car to the dyno, and you notice that torque and horsepower cross paths at 5, RPM. You add some modifications to your car, increasing both power and torque, and yet again they both cross at 5, RPM. Why is this, and is it meaningful? This video discusses the physics, the theory, and the math behind this magical number.

And then you add a Turbo into the mix and throw this maths out the window. Turbos don't make a difference to the equation. I think two strokes and maybe diesels are the exception to this rule since most diesels don't rev higher than Rpm. The maths still checks out for diesels - the only difference is that you won't see the crossover on the dyno-graph unless you play around with the scale on an axis, as mentioned in the video because, as you quite rightly say, most stock Just search Google Images for dyno charts and you'll be blown away by how often this is the case.

But why? Jason Fenske at Engineering Explained details why hp and torque always seem to cross at rpm in his latest video, but just be warned, there's lots of math involved. I could try writing out all of the equations and formulas he uses right here, but honestly you'll be better off watching the video below.

The visual aid of a whiteboard is necessary. The answer to my question, and indeed much more, came from an intelligent young man with some grays himself named Jason Fenske who operates a YouTube channel titled Engineering Explained.

A mechanical engineer with a passion for cars, Fenske explains the mathematics behind engines, transmissions and driving characteristics, in a matter-of-fact manner that most of us can understand well, after watching more than once anyhow.