This page
contains some JavaScript formulas to convert fuel efficiency,
horsepower, torque, speed, weight, and temperature. Simply type the
number in one box, press TAB, and the conversion will appear in the
other boxes in that group.
Fuel Efficiency Conversions
The formulas used
are:
mpg = 242.77 / DIN km/liter=100 / DIN
Power Conversions
Horsepower is a measurement of the engine's ability to perform work. One SAE
horse is the ability to lift 33,000 lbs one foot in one minute. One DIN
horse is the ability to lift 450000 kg one cm in one minute. For the same
power the SAE measurement is thus 98.629% of the metric DIN measurement.
If you see the term bhp, it just means "brake horsepower", which is the
actual usable horsepower delivered to the rear wheels of the car. It is
so named because a brake is applied to determine how much pressure is
needed to stop or absorb the power. bhp could reference either DIN or
SAE horsepower.
Power is effectively torque times rpms, so if you keep the same amount
of torque and double the revs, you double the effective power. This is
why most engines have the highest horsepower rating at higher RPMs. And
along those lines, you can have an engine that has lots of horsepower at
higher RPMs, but not much energy at lower RPMs where it counts off the
line, so often torque ends up being a more interesting measurement than
horsepower.
The formulas used are:
SAE = kW * 1.341 DIN = kW * 1.360
Torque Conversions
Torque is the pushing force or energy that an engine has,
represented as a certain amount of weight times a certain amount of distance
from the center of the rotating shaft. The above three measurements are the
common ones used worldwide for engine torque.
The formulas used are:
Nm = ft. lbs. * 1.38273 kg*m = Nm / 9.80297
Speed Conversions
Note that you can also use the mph and kph fields to convert miles
to kilometers, disregarding the other three fields.
