Stop in for a cup of coffee

Ben Drinkin said
OK.. i get that on a chassis dyno there are torque multiplication factors from gearing and parasitic losses...... I'm just looking at engine dyno stuff (which seem to use about 3k as their bottom rpm range). But if any engine makes 300 lb-ft of torque at 2626 rpm, horsepower is half that? Math says so... and if it makes 400 T, HP is 200???? Just trying to wrap my head around it. Seems the 'gap' between HP and torque curves should look the same (or similar) for any engine (granted it's torque producing properties could make the slopes of the lines radically different, but the numeric 'gap' should remain the same, percentagewise).. i may be high tho...

Well, if you look at this curve you see that HP and Tq intercept at 5252 and HP is exactly 1/2 of Tq at 2626 but the rest of the curve relationship seems to fall apart...

The reason that the relationship between HP and Tq appears to be non-linear is because the shape of each curve isn't linear. But, if you take any given rpm and apply the calculation for that point you find that they are actually following the rules.