Re: [DMCForum] Facts for Farrar.
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Re: [DMCForum] Facts for Farrar.



Honestly Farrar, I got halfway through your 16 page "factsheet" and got
bored.  Sorry ;)

Some of us are better at explaining stuff than others, apparently.
Having said that, here's my explanation!

Horsepower is never time.
Torque is never power. 

Horsepower is a measurement made up by James Watt to measure POWER, which
can also be measured in WATTS.  It is supposedly the amount of power that
an average horse can generate over an extended period of time.

Engines are measured for their peak power output, which is peak HP.
However, peak HP does not measure where in the RPM range the horsepower
will be available.  This is why engines are also commonly measured for
their peak torque, which tells you where in the RPM range the horsepower
is available.  200 Honda Horsepower is not equal to 200 Ford Diesel
Horsepower.  The Diesel HP will be available at much lower RPM (like
2500RPM), whereas the Honda HP will be available at more like 7500RPM.
The diesel has much more torque than the honda, which is evident if you
work out the equations using HP and RPM. 

Torque can be multiplied by using gears.  This is why tractor trailers
have a $hit-ton of gears.  They are geared very low and close together to
multiply the torque in order to get the load moving.  You could also have
a 60HP Honda engine in tractor trailers if it had the correct gearing.
It would most likely be in the hundreds of gears (in order to get from
one gear to the next, and still have enough torque to move the load), and
is therefore not a reasonable engine. 

Any truck in 4-LO will drag around a truck in 2-HI with comparable
horsepower. 

Jim



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