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PostPosted: Thu Sep 04, 2008 6:56 am 
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ATVing To The End
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Joined: Fri Nov 21, 2003 4:56 pm
Posts: 3812
Location: Ohio
But, since you can't have hp without torque, this whole discussion is somewhat moot. Torque is the root of all motivating power. The key question is where do you want that torque, in the lower rpm bands or the upper, as 3TV so appropriately versed it. Horsepower is a term coined by James Watt, to compared the relative output of his steam engines to those of Newcomen, and attempt to give the potential buyer an idea of how much work they could do.

A large displacement 4 stroke will develop large torque figures right off idle, but small hp figures, since hp is speed related. The smaller the displacement, the less the low rpm torque, since the torque output is directly related to the energy consumed.

hp= (Torque x rpm)/5252

Conversely, a large (relatively) displacement 2 stroke will develop very little torque until the engine speed has reached a certain rpm, and then it kicks in and produces high hp output, thanks to that rpm.


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PostPosted: Mon Jun 29, 2009 12:51 am 
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ATV Nut Member
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Joined: Sat Nov 04, 2006 10:10 pm
Posts: 267
Location: West Virginia
Torque. Without a doubt.

As mentioned, horse power is depended upon RPM's, torque isn't.


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