How can I find out how many horsepower my engine is?

But was Antinomian correct that 3.43's accelerate faster and pull loads up hills faster than 3.25's?

 

Which affects acceleration and pulling loads uphill more, horsepower or the differential? It sounds like you might disagree with Antinomian.

What does low profile 22.5s mean?

I know what a transmission is, but what is a direct transmission on a big rig? Do some big rigs have indirect transmissions?

 

Differential ratio makes next to zero difference in how fast you get up the hill. Horsepower is the ability to do work. That comes from what's under the hood. Different ratio might get you into a better spot in the powerband but its not going to make a noticeable difference IMO.

 

What is the powerband?

 

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That's easy its how many horses you can fit under the bonnet ( hood) . Ok all jokes aside the original calculation of a horsepower was from an experiment which set out to measure the power of a single horse. It was determined that a horse is capable of performing 33,000 ft-lbf of work per min.The definition of 1 Horsepower is displacing 1 lb. 33,000 ft. in one minute or 33,000 lb-ft / minute. 1HP = 1 lb x 33,000 ft / 1 minute , or Horsepower = Torque x RPM / 5,252 so if Torque was 1690 lb ft x 1600 rpm / 5252 = 515 hp.