Posts Tagged ‘k4.6 engine torque’

Whether you’re a science student, motorist or RC enthusiast, at some point you’d like to know how much torque is your motor good for. While there are elaborate tests to determine this, here’s a mathematical formula to determine your motor or engine’s torque, using existing information you may have on Horse Power (HP), and RPM. Assuming the information you have from the manufacturer’s manual is correct, you should have an accurate figure on the motor’s torque.

Remember, we’re talking about motor or engine torque here – not the torque at the wheels – for that, it’s a whole ballgame altogether where wheel weights and dimensions play a part, and you’ll need a dynometer.

Motor Torque = HP x 5252 / RPM

Let’s do a little case study example on the HPI Nitrostar K4.6 engine that comes stock on the Savage X 4.6 and the Savage X SS.

HP = 2.9

RPM= 35,000

Going by the above equation, the Nitrostar K4.6’s torque would then be as follows:

Torque (K4.6) = 2.9 x 5252 /35000
= 0.435

That’s pretty pathetic.

On the other hand let’s see how the SH .28 base model engine would do:

HP = 3.3

RPM = 28,000

Torque (SH .28) = 3.3 x 5252 / 28,000
= 0.62.

A good 50% more.