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Re: Re: Torque and Horsepower
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Posted by Don Wadge on January 30, 2002 at 14:29:48 from (205.200.74.201):
In Reply to: Re: Torque and Horsepower posted by steve on January 30, 2002 at 13:15:46:
OK- here we go again. I understand that horsepower is a measurement of work done, but generally we talk about horsepower as if it were available. For instance in my example the truck could pull the load at 62MPH so before the man started he had that horsepower available ( X HP ). So we talk about that engine being an X HP engine. Bill From Up North's mention of the steam engine is a good example. You will have often observed the throttle being opened on a steam engine and the engine almost begins to make forward motion then just sits. There is torque against the gearing but not enough so as to actually create forward motion; so ther is torque but no horsepower because nothing is happening. So here's where I run into trouble. I'm not sure in this post what you are telling me. Going back to my example of the two trucks at 62MPH. Now they come to a slight hill (2% grade). They're both already maxed out. Are they both going to slow down the same amount? Or, is one not going to slow down as much because the engine has more torque. I know this opens up a lot of potential answers like it depends on the torque curve of the engine. Lets stay away from that one. Does the fact that an engine has high torque in relation to another give it any advantage in maintaining truck speed? My feeling is that power to the pavement is power to the pavement. If its 55, 60 or 62MPH- whatever it takes at each of these speeds, thats what it takes and you can get that with low torque & high rpm OR high torque low rpm.
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