Torque and BHP

Because torque x rpm = power.

So the merc will be tons slower due to it making its torque at lower rpm. This means that at any given road speed it needs much taller gearing reducing torque at the wheel.

Thats the simple answer!

The more complex one is that the SHAPE of the power curve and the area under the graph is what counts.

Or...

Torque is only comparable directly in relation to performance if measured at the wheel at any given roadspeed. But bhp takes all that into account so it is DIRECTLY comparable.

A 400 bhp turbo bike engine will propel your truck just as well as a 400 bhp truck engine and it will do so at 5 times the rpm with one fifth the torque due to gearing.

No, the merc will be tons slower due to being 18 tons, even with the same engine.

Yes well that as well!

So you've married a footballer and dyed your hair blonde? ;-)

David

Shh! Don't tell.